Updated on 2026/03/10

写真a

 
HIRAI SHUICHIRO
 
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School of Engineering Researcher
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Researcher
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News & Topics
  • World's First Real-time Visualization of Water Produced Inside Fuel Cells

    2017/11/17

    Languages: English

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    As part of the NEDO project, Tokyo Institute of Technology (Tokyo Tech) has successfully developed the world's first technology capable of visualizing, in real-time and in high-resolution, the behaviors of the water produced inside operating fuel cells. As a result of this breakthrough, it is now possible to observe the behavior of the water produced in fuel cells for automobiles which often experience drastic changes in reactions. The technology is expected to accelerate improvements in fuel cells that will enable higher performance and better durability and to accelerate technology development that will contribute to new design guidelines.

  • 世界初、燃料電池の反応生成液水の可視化を実現

    2017/10/12

    Languages: Japanese

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    NEDO事業において、東京工業大学は、作動中の燃料電池内の反応生成液水の挙動をリアルタイム・高解像度で可視化できる技術の開発に世界で初めて成功しました。これにより、反応が激しく変化する自動車用燃料電池の生成液水挙動の把握が可能となり、高性能化・高耐久化を目指す燃料電池の特性改善や設計指針に資する技術開発の加速が期待されます。

  • Soft X-rays: New Visualization Tool for Light Weight Elements in Energy Devices

    2011/01/31

    Languages: English

  • Energy solutions

    2009/03/31

    Languages: English


News & Media

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

Papers

  • Carbon Nanofiber-Based Thin Gas Diffusion Layers for Polymer Electrolyte Fuel Cells

    Shaoling Zhang, Hidetoshi Matsumoto, Keisuke Sato, Yudai Ishikawa, Hiroshi Naito, Katsuyuki Kawamura, Katsunori Sakai, Shuichiro Hirai

    ACS Engineering Au   2025.7

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsengineeringau.5c00028

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  • High pressure–temperature picosecond acoustic measurements on Fe using an internal-resistive-heated diamond anvil cell

    Yoshihiro Nagaya, Takashi Yagi, Ryoto Ebina, Kei Hirose, Manabu Kodama, Shuichiro Hirai, Kenji Ohta

    High Pressure Research   1 - 15   2025.6

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    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/08957959.2025.2520559

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  • フロー型亜鉛空気電池の負極オペランドX線イメージング

    Shumpei KUBOTA, Wooseok KANG, Manabu KODAMA, Atsunori IKEZAWA, Hajime ARAI, Shuichiro HIRAI

    Transactions of the JSME (in Japanese)   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/transjsme.24-00098

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  • Operando X-Ray Imaging of the Charge-Discharge Behavior of Zinc-Air Batteries

    Wooseok KANG, Shumpei KUBOTA, Manabu KODAMA, Atsunori IKEZAWA, Hajime ARAI, Shuichiro HIRAI

    Electrochemistry   2024

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society of Japan  

    DOI: 10.5796/electrochemistry.24-00053

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  • Machine Learning Super-Resolution of Laboratory CT Images in All-Solid-State Batteries using Synchrotron Radiation CT as Training Data

    M. Kodama, A. Takeuchi, M. Uesugi, S. Hirai

    Energy and AI   100305 - 100305   2023.9

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.egyai.2023.100305

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  • Operando X-Ray Imaging of Gas-Electrolyte Behavior in the Zinc-Air Batteries

    Wooseok Kang, Manabu Kodama, Atsunori Ikezawa, Hajime Arai, Shuichiro Hirai

    ECS Meeting Abstracts   2023.8

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1149/MA2023-011406mtgabs

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  • Numerical simulations of all-solid-state batteries using specific contact area diameters for active materials determined by X-ray computed tomography Reviewed

    S. Iwamoto, M. Kodama, K. Yanagi, Y. Haniu, Y. Fujii, N. Masuda, H. Higuchi, Y. Suetsugu, S. Hirai

    Journal of Power Sources Advances   100120   2023.6

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.powera.2023.100120

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  • Experimental and in silico simulation of slot-die coating with a polymer electrolyte fuel cell catalyst slurry

    M. Kodama, K. Kiso, K. Sakai, T. Sasabe, S. Hirai

    International Journal of Hydrogen Energy   2023.5

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.ijhydene.2023.05.043

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  • 3D Visualization of Liquid Water in Catalyst Layer Using X-Ray CT

    Takaya Sugahara, Takashi Sasabe, Hiroshi Naito, Manabu Kodama, Shuichiro Hirai

    ECS Transactions   109 ( 9 )   135 - 139   2022.9

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    To clarify the behavior of liquid water in polymer electrolyte fuel cell (PEFC), X-ray computed tomography (XTM) is used. In the past, 3D visualization experiments of liquid water in substrate layer and microporous layer (MPL) were conducted. However, 3D visualization of liquid water in catalyst layer (CL) has not been conducted yet. It is important to clarify liquid water in CL because water is generated in CL. We improved two things. First, we used the CL with low platinum percentage because its X-ray absorption coefficient is low. Second, 20.5-hour CT scan was conducted to improve spatial resolution. Therefore, we succeeded the detection of liquid water in CL.

    DOI: 10.1149/10909.0135ecst

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    Other Link: https://iopscience.iop.org/article/10.1149/10909.0135ecst/pdf

  • Improvement of lithium-metal electrode performance of all-solid-state batteries by shot peening on solid-electrolyte surface

    M. Kodama, K. Takashima, S. Hirai

    Journal of Power Sources   537   231556 - 231556   2022.7

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jpowsour.2022.231556

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  • インクジェットプリンティング液滴浸透のX線計測と数値解析 Invited Reviewed

    岩本 頌平, 兒玉 学, 原田 祥宏, 加藤 弘一, 門永 雅史, 伏信 一慶, 平井 秀一郎

    日本画像学会誌   61 ( 2 )   98 - 104   2022.4

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.11370/isj.61.98

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  • Three-dimensional coupling numerical simulation of two-phase flow and electrochemical phenomena in alkaline water electrolysis

    Kenjiro Torii, Manabu Kodama, Shuichiro Hirai

    International Journal of Hydrogen Energy   46 ( 71 )   35088 - 35101   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier Ltd  

    DOI: 10.1016/j.ijhydene.2021.08.101

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  • Impact of Solvent Decomposition on Dispersion Structure of PEFC Catalyst Ink

    Takashi Sasabe, Kaname Iida, Katsunori Sakai, Suguru Uemura, Kazuhiko Shinohara, Shuichiro Hirai

    ECS Transactions   104 ( 8 )   191 - 196   2021.10

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    DOI: 10.1149/10408.0191ecst

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    Other Link: https://iopscience.iop.org/article/10.1149/10408.0191ecst/pdf

  • 3D Visualization of Liquid Water Penetration from MPL to Substrate Layer in PEFC Using in-Situ X-Ray Tomographic Microscopy

    Takaya Sugahara, Takashi Sasabe, Hiroshi Naito, Manabu Kodama, Shuichiro Hirai

    ECS Transactions   104 ( 8 )   93 - 99   2021.10

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    DOI: 10.1149/10408.0093ecst

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    Other Link: https://iopscience.iop.org/article/10.1149/10408.0093ecst/pdf

  • Reaction Products Affecting the PEFC Catalyst Ink Property

    Suguru Uemura, Takashi Sasabe, Katsunori Sakai, Hidetoshi Matsumoto, Hidekazu Sugimori, Kazuhiko Shinohara, Shuichiro Hirai

    Journal of the Electrochemical Society   168 ( 10 )   2021.10

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1149/1945-7111/ac2684

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  • Magnetohydrodynamic Numerical Simulation of Bubble-Bubble Interaction in Alkaline Water Electrolysis with Magnetic Field Reviewed

    Manabu Kodama, Hikaru Matsumae, Takeshi Kiuchi, Naoki Murakami, Shuichiro Hirai

    IEEJ Transactions on Power and Energy   141 ( 7 )   541 - 546   2021.7

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical Engineers of Japan (IEE Japan)  

    DOI: 10.1541/ieejpes.141.541

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  • Microstructure Investigation of Polymer Electrolyte Fuel Cell Catalyst Layers Containing Perfluorosulfonated Ionomer

    Maito Koga, Hidetoshi Matsumoto, Mitsunori Kunishima, Masatoshi Tokita, Hiroyasu Masunaga, Noboru Ohta, Akihisa Takeuchi, Junji Mizukado, Hidekazu Sugimori, Kazuhiko Shinohara, Suguru Uemura, Toshihiko Yoshida, Shuichiro Hirai

    Membranes   11 ( 7 )   466 - 466   2021.6

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    Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Perfluorosulfonated ionomers are the most successful ion-exchange membranes at an industrial scale. One recent, cutting-edge application of perfluorosulfonated ionomers is in polymer electrolyte fuel cells (PEFCs). In PEFCs, the ionomers are used as a component of the catalyst layer (CL) in addition to functioning as a proton-exchange membrane. In this study, the microstructures in the CLs of PEFCs were characterized by combined synchrotron X-ray scattering and transmission electron microscopy (TEM) analyses. The CL comprised a catalyst, a support, and an ionomer. Fractal dimensional analysis of the combined ultrasmall- and small-angle X-ray scattering profiles indicated that the carbon-black-supported Pt catalyst (Pt/CB) surface was covered with the ionomer in the CL. Anomalous X-ray scattering revealed that the Pt catalyst nanoparticles on the carbon surfaces were aggregated in the CLs. These findings are consistent with the ionomer/catalyst microstructures and ionomer coverage on the Pt/CB surface obtained from TEM observations.

    DOI: 10.3390/membranes11070466

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  • Three-dimensional structural measurement and material identification of an all-solid-state lithium-ion battery by X-Ray nanotomography and deep learning Reviewed

    M. Kodama, A. Ohashi, H. Adachi, T. Miyuki, A. Takeuchi, M. Yasutake, K. Uesugi, T. Kaburagi, S. Hirai

    Journal of Power Sources Advances   8   100048 - 100048   2021.4

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.powera.2021.100048

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  • Quantitative measurement of ion transport phenomena in an operating lithium-ion battery by low-energy X-ray microscopy and nuclear magnetic resonance spectroscopy

    Suguru Uemura, Shohei Komiyama, Toshikazu Kotaka, Osamu Aoki, Sohei Suga, Yuichiro Tabuchi, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   491   2021.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jpowsour.2021.229601

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  • Coupled nonlinear stress and electric field numerical simulation for all-solid-state lithium-ion batteries Reviewed

    M. Kodama, N. Horikawa, A. Ohashi, S. Hirai

    Journal of Power Sources Advances   8   100049 - 100049   2021.4

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.powera.2021.100049

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  • Effect of Young's modulus of active materials on ion transport through solid electrolyte in all-solid-state lithium-ion battery Reviewed

    A. Ohashi, M. Kodama, N. Horikawa, S. Hirai

    Journal of Power Sources   483   229212 - 229212   2021.1

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jpowsour.2020.229212

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  • Effect of Solvent Composition on Coating Stabilit\ of PEFC Catal\st Ink

    Kiso Kenta, Uemura Suguru, Kodama Manabu, Sakai Katsunori, Sasabe Takashi, Hirai Shuichiro

    The Proceedings of the Thermal Engineering Conference   2020   0099   2020.10

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    The PEFC catal\st la\er is generall\ prepared b\ coating the catal\st ink using a slot die, but it is known that streak\ defects occur with high-speed coating. In this stud\, coating e[periments using catal\st inks with different solvent compositions are conducted to elucidate the effect of the solvent composition on coating stabilit\. The results show the coating stabilit\ changed due to the difference in viscosit\ and surface tension when the ethanol/water ratio of the solvent was different.

    DOI: 10.1299/jsmeted.2020.0099

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  • Effect of Reaction Products on the PEFC Catalyst Ink Property and Catalyst Layer Quality

    Suguru Uemura, Katsunori Sakai, Takashi Sasabe, Hidetoshi Matsumoto, Hidekazu Sugimori, Kazuhiko Shinohara, Shuichiro Hirai

    ECS Transactions   98 ( 9 )   61 - 65   2020.9

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    DOI: 10.1149/09809.0061ecst

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    Other Link: https://iopscience.iop.org/article/10.1149/09809.0061ecst/pdf

  • Effects of Solvent Composition on Viscosity and Dispersion Structure of PEFC Catalyst Ink

    Kaname Iida, Takashi Sasabe, Katsunori Sakai, Suguru Uemura, Kazuhiko Shinohara, Shuichiro Hirai

    ECS Transactions   98 ( 9 )   497 - 501   2020.9

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    Structure and performance of PEFC catalyst layer (CL) is greatly influenced by dispersion structure of catalyst ink. Though the solvent composition of the catalyst ink affects the CL performance, correlation between solvent composition, CL structure, and performance has not been fully understood. The purpose of this study was to understand the effects of solvent compositions of the catalyst ink on the dispersion structure, the viscosity characteristics, and the CL structure. Four catalyst inks with different water/ethanol ratio were prepared, and the viscosity characteristics under different shear rate and the particle size distributions were measured without dilution. It was observed that the catalyst ink with higher ethanol ratio had higher viscosity and larger particle size, and it was suggested that decomposition product of ethanol by platinum catalyst affect the viscosity and the dispersion structure of the catalyst ink. Because the aggregates with in the catalyst ink strongly affect the CL structure, it is important to choose the solvent composition.

    DOI: 10.1149/09809.0497ecst

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    Other Link: https://iopscience.iop.org/article/10.1149/09809.0497ecst/pdf

  • Laboratory-based x-ray computed tomography for 3D imaging of samples in a diamond anvil cell in situ at high pressures Reviewed

    Kenji Ohta, Tatsuya Wakamatsu, Manabu Kodama, Katsuyuki Kawamura, Shuichiro Hirai

    Review of Scientific Instruments   91 ( 9 )   093703 - 093703   2020.9

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    DOI: 10.1063/5.0014486

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  • Stress distribution in the composite electrodes of sulfide all-solid-state lithium-ion batteries Reviewed

    Akinari Ohashi, Manabu Kodama, Sun Xueying, Satoshi Hori, Kota Suzuki, Ryoji Kanno, Shuichiro Hirai

    Journal of Power Sources   470   228437 - 228437   2020.9

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jpowsour.2020.228437

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  • In situ X-ray computational tomography measurement of single particle behavior of sulfide solid electrolyte under high-pressure compression Reviewed

    M. Kodama, A. Ohashi, S. Hirai

    Journal of Power Sources Advances   4   100019 - 100019   2020.8

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.powera.2020.100019

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  • X-Ray CT 3D Structure Measurement and Performance Evaluation of All Solid-State Lithium-Ion Battery Anode Reviewed

    Manabu Kodama, Shohei Komiyama, Satoshi Hori, Kota Suzuki, Ryoji Kanno, Shuichiro Hirai

    ECS Transactions   97 ( 7 )   127 - 133   2020.7

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    DOI: 10.1149/09707.0127ecst

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    Other Link: https://iopscience.iop.org/article/10.1149/09707.0127ecst/pdf

  • Overvoltage Suppression Mechanism of Alkaline Water Electrolysis by Magnetic Field with Two-phase Flow and Magneto Hydro Dynamic Coupling Numerical Simulation Around a Bubble Reviewed

    Manabu Kodama, Takeshi Kiuchi, Kenjiro Torii, Shuichiro Hirai

    IEEJ Transactions on Power and Energy   140 ( 7 )   617 - 622   2020.7

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    Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical Engineers of Japan (IEE Japan)  

    DOI: 10.1541/ieejpes.140.617

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  • High-pressure in situ X-ray computed tomography and numerical simulation of sulfide solid electrolyte

    M. Kodama, S. Komiyama, A. Ohashi, N. Horikawa, K. Kawamura, S. Hirai

    Journal of Power Sources   462   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    DOI: 10.1016/j.jpowsour.2020.228160

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  • Two-dimensional ton transportation numerical simulation of anode cell of electrolyzed water generator Reviewed

    Manabu KODAMA, Yoshihisa TOSE, Kazuhiko OKUMURA, Shuichiro HIRAI

    Transactions of the JSME (in Japanese)   86 ( 892 )   20 - 00183   2020

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/transjsme.20-00183

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  • X-Ray CT Measurement of All Solid State Lithium-Ion Battery Under High Pressure Condition

    Manabu Kodama, Suguru Uemura, Takuhiro Miyuki, Shuichiro Hirai

    ECS Meeting Abstracts   MA2019-02 ( 7 )   705 - 705   2019.9

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    All Solid-state lithium ion Battery (ASB) with sulfide Solid Electrolyte (SE) would achieve high energy density and high-speed charging with high ion conductivity and wide potential window of solid electrolyte, therefore, ASB can be a solution to improve the cruising distance of electrical vehicle.

    The charging speed, energy density, and battery life of the ASB is depend on internal structure in the electrode due to the lithium ion is transported in the contact surface of the SE and Active Material (AM). Several studies with surface measurement of ASB have been conducted with SEM (Scanning Electron Microscope) and Laser-microscope to reveal the internal structure of ASB. In these studies, the observed area is only the surface and cross section of ASB, and is not the inside. Moreover, the ASB is mainly used under high pressure condition to suppress the ion transportation resistance in SE-SE interface and SE-AM interface and it is difficult to observe the structure under pressured condition with the SEM and Laser-microscope.

    X-ray CT imaging is an only method to observe the internal structure of ASB under high pressure condition. 3D image is generated with the reconstruction of X-ray tomography images, therefore, non-destructive observation can be achieved. Several X-ray CT measurement of ASB are conducted and internal structure of ASB have been visualized. However, in these experiments, the applied pressure (9MPa) is low and X-ray CT measurement under high pressure condition should be conducted.

    The pressurizing condition is also important and is not discussed in the previous studies. The ASB can be pressured by uni-axial compression and multi-axial compression. If the battery cell is enough big, the edge region of the cell is compressed uni-axially and the balk region is compressed multi-axially. The mechanical and electrochemical characteristics can be changed with these compression condition.

    From the background mentioned above, we conducted X-ray CT measurement of all solid-state lithium ion battery under high pressure condition (up to 400MPa). To achieve high S/N ratio X-ray CT image under this high-pressure condition, we successfully developed a high-pressure X-ray CT cell in which the dew point is lower than -70℃ to prevent the corrosion of SE by water vapor. The multi-axial pressuring is achieved with Boron Nitride pressure medium.

    The experimental results are as follows.

    Figure 1 illustrates the cross-section view of ASB w/o pressure medium. Micro-scale clacks are generated at 35MPa. These clacks are generated by the crash of ASB with uni-axial compression. With the increase of pressure, the micro-scale clacks are disappeared. The gap between the side-wall and ASB is filled and side-pressure is induced, and the pressurizing is changed from uni-axial compression to multi-axial compression. The multi-axial compression flows the SE and AM in cross-sectional plane and the micro-scale clacks are disappeared.

    Figure 2 illustrate the cross-sectional view of ASB with the pressure medium. In this case, the micro-scale clacks are not generated in any pressure. This finding suggests that the internal structure strongly depend on the pressurizing condition (uni-axial or multi-axial) and the uni-axial compression generates the micro-crack.

    Figure 3 and 4 shows the thickness of Anode, Separator, and Cathode measured by the CT scan as a function of the applied pressure. In the case w/o pressure medium (Fig.3), the total thickness decreases by 20% from 0MPa to 35MPa due to the uni-axial compression with generating the micro-scale clacks. From 35MPa to 100MPa, the thickness decreases slightly by the refilling the clacks with the flow of the SE and AM. After the refilling, the thickness is not changed over 100MPa. In the case with pressure medium (Fig.4), contrast to the w/o pressure medium case, the compression amount is very small and is only -5%.

    From these experimental results, following conclusions can be drawn.

    The uni-axial compression clashes the battery structure and micro-scale clacks are generated. This micro-scale clack is refilled by solid electrolyte and active material with the increase of the applied pressure to 100MPa. The clack is not generated at 0MPa-400MPa when the compression is multi-axial compression and the decrease of the thickness is smaller than that with uni-axial compression.





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    DOI: 10.1149/ma2019-02/7/705

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    Other Link: https://iopscience.iop.org/article/10.1149/MA2019-02/7/705/pdf

  • Ink Degradation and Its Effects on the Crack Formation of Fuel Cell Catalyst Layers

    Suguru Uemura, Toshihiko Yoshida, Maito Koga, Hidetoshi Matsumoto, Xiaoqi Yang, Kazuhiko Shinohara, Takashi Sasabe, Shuichiro Hirai

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   166 ( 2 )   F89 - F92   2019.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1149/2.0411902jes

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  • Analysis of PEFC Gas Transport by Combination of X-Ray Radiography and Numerical Simulation

    Naito, Hiroshi, Kawamura, Katsuyuki, Sakai, Katsunori, Sasabe, Takashi, Hirai, Shuichiro

    ECS Transactions   92 ( 8 )   153 - 160   2019

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  • In situ analysis of lithium-ion secondary battery using low-energy X-ray microscopy

    UEMURA, Suguru, SASABE, Takashi, TABUCHI, Yuichiro, KURIHARA, Junko, JAO, Ting Chu, HIRAI, Shuichiro

    Mechanical Engineering Letters   5   00452 - 00452   2019

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  • Relation between degradation reaction and mixing at fuel cell catalyst ink fabrication process

    S. Uemura, T. Sasabe, K. Sakai, K. Shinohara, S. Hirai

    ECS Transactions   92 ( 8 )   183 - 187   2019

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1149/09208.0183ecst

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  • Three-Dimensional Numerical Coupling Simulation of Two-Phase Flow and Electrochemical Phenomena on Alkaline Water Electrolysis

    Torii, Kenjiro, Kodama, Manabu, Hirai, Shuichiro

    ECS Transactions   92 ( 8 )   781 - 786   2019

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  • Effect of PEFC Rib/Channel Width on Liquid Water Accumulation and Discharge by In-situ X-Ray Imaging

    Komiyama, Takahiro, Sasabe, Takashi, Kawamura, Katsuyuki, Naito, Hiroshi, Hirai, Shuichiro

    ECS Transactions   92 ( 8 )   147 - 152   2019

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  • Effects of EtOH/Water Ratio of PEFC Catalyst Ink on Catalyst Layer Structure and Performance

    Yang Xiaoqi, Sasabe Takashi, Uemura Suguru, Hirai Shuichiro

    The Proceedings of the Thermal Engineering Conference   2019   0147   2019

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Catalyst layer is the place where electrochemical reaction occurs in PEFC and strongly affects cell performance. Catalyst ink, which is the raw material of the catalyst layer, is known to be directly linked to the catalyst layer structure and performance. In this study, catalyst ink with different ethanol/water ratio was prepared, and the impact of solvent composition of the catalyst ink on the microstructure and the cell performance were investigated. As for structural analysis, cross-sectional structure and pore size distribution was measured. As for electrochemical characteristics, performance, electrochemical surface area and oxygen transport resistance of CLs were investigated. According to these analyses, it is possible to obtain high performance fuel cell by selecting an appropriate ethanol/water ratio.

    DOI: 10.1299/jsmeted.2019.0147

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  • Oxygen concentration measurement in the porous cathode of a lithium-air battery using a fine optical fiber sensor

    FUJIMOTO, Shogo, UEMURA, Suguru, IMANISHI, Nobuyuki, HIRAI, Shuichiro

    Mechanical Engineering Letters   5   00095 - 00095   2019

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  • Mechanical Engineering Letters

    UEMURA, Suguru, SASABE, Takashi, TABUCHI, Yuichiro, KURIHARA, Junko, JAO, Ting Chu, HIRAI, Shuichiro

    Mechanical Engineering Letters   5   00452 - 00452   2019

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  • Investigation of effects of high temperature and pressure on a polymer electrolyte fuel cell with polarization analysis and X-ray imaging of liquid water

    Akitomo, Fumiya, Sasabe, Takashi, Yoshida, Toshihiko, Naito, Hiroshi, Kawamura, Katsuyuki, Hirai, Shuichiro

    Journal of Power Sources   431   205 - 209   2019

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  • アルカリ水電解における気泡挙動とイオン輸送・反応の連成数値シミュレーション

    梅原大輔, 平井秀一郎

    日本機械学会論文集   84 ( 865 )   00040 - 00040   2018

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  • Visualization of water adsorption/desorption phenomena in silica-gel particle by microfocus X-ray transmission imaging

    UEMURA, Suguru, YASUDA, Keisuke, ITO, Yukihide, ITO, Mutsuhiro, HIRAI, Shuichiro

    Mechanical Engineering Letters   4   00053 - 00053   2018

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  • Visualization Study about Effects of Local Structure of Micro Porous Layer by X-Ray Radiography

    Naito, Hiroshi, Yoshida, Toshihiko, Sasabe, Takashi, Kawamura, Katsuyuki, Hirai, Shuichiro

    ECS Transactions   86 ( 13 )   127 - 132   2018

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  • Molecular diffusion and mobility characterization in ionomer/catalyst dispersions using nuclear magnetic resonance spectroscopy-imaging combined technique

    Yuki Kameya, Norio Iriguchi, Toshihiko Yoshida, Takashi Sasabe, Shuichiro Hirai

    Colloid and Polymer Science   296 ( 11 )   1817 - 1825   2018

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    DOI: 10.1007/s00396-018-4400-1

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  • Study of the effect of positive electrode structure in an aqueous lithium air battery on its performance

    UEMURA Suguru, YAMASHITA Yudai, HIRAI Shuichiro

    The Proceedings of Mechanical Engineering Congress, Japan   2018   J0310302   2018

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    Lithium-air battery attracts great attention because of its high energy density. However, low solubility of oxygen in aqueous electrolyte limits oxygen transport to the reaction site. To realize a more powerful aqueous lithium-air battery, it is necessary to clarify the effect of positive electrode structure on its performance. In this study, positive electrodes using nano carbon material were fabricated and investigated the effect of electrode structure on discharge characteristics. As the specific surface area of the electrode material increased, the performance was improved. However, oxygen was not transported to inside of the electrode and sufficient performance was not achieved. For this reason, a composite electrode structure having a crack in a fine porous structure was fabricated and performed a discharge test. As a result, the potential reduction in the high current density region was suppressed. It was considered that oxygen was transported into the electrode through the crack and the effective reaction field was increased.

    DOI: 10.1299/jsmemecj.2018.j0310302

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  • Advanced X-ray visualization of fuel cell and lithium ion battery Reviewed

    S. Hirai, H. Naito, T. Yoshida, T. Sasabe, K. Kawamura, S. Uemura

    International Heat Transfer Conference   2018-August   265 - 275   2018

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  • Ink degradation phenomena and its impact on crack formation of fuel cell catalyst

    S. Uemura, T. Yoshida, M. Koga, H. Matsumoto, K. Shinohara, S. Hirai

    ECS Transactions   86 ( 13 )   151 - 156   2018

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    DOI: 10.1149/08613.0151ecst

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  • Communication—Investigation of catalyst ink degradation by X-ray CT

    Suguru Uemura, Yuki Kameya, Norio Iriguchi, Toshihiko Yoshida, Kazuhiko Shinohara, Shuichiro Hirai

    Journal of the Electrochemical Society   165 ( 3 )   F142 - F144   2018

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    DOI: 10.1149/2.0411803jes

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  • Numerical simulation of heat pipe with verification of X-ray CT Reviewed

    Suguru Uemura, Shozo Yoshimura, Takashi Imai, Shuichiro Hirai

    International Heat Transfer Conference   2018-August   4543 - 4548   2018

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  • Investigation of Drying Process of Catalyst Ink for Polymer Electrolyte Fuel Cells by Grazing-Incidence X-Ray Scattering

    Koga, Maito, Matsumoto, Hidetoshi, Tokita, Masatoshi, Masunaga, Hiroyasu, Hikima, Takaaki, Sugimori, Hidekazu, Sasabe, Takashi, Yoshida, Toshihiko, Shinohara, Kazuhiko, Hirai, Shuichiro

    ECS Transactions   86 ( 13 )   157 - 161   2018

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  • Photocatalytic soot oxidation on TiO2 microstructured substrate

    Yuki Kameya, Kenjiro Torii, Shuichiro Hirai, Massoud Kaviany

    CHEMICAL ENGINEERING JOURNAL   327   831 - 837   2017.11

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    DOI: 10.1016/j.cej.2017.06.094

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  • MRI and 1H/19F NMR Investigation of Dispersion State of PEFC Catalyst Ink

    Yuki Kameya, Norio Iriguchi, Maria Ohki, Kouji Yokoyama, Seiho Sugawara, Hidekazu Sugimori, Suguru Uemura, Takashi Sasabe, Toshihiko Yoshida, Shuichiro Hirai

    ECS Meeting Abstracts   MA2017-02 ( 35 )   1554 - 1554   2017.9

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    The catalyst layer (CL) of polymer electrolyte fuel cell (PEFC) comprises catalyst particles, catalyst support (e.g., carbon particles), and proton-conductive ionomers. The CL plays a critical role in PEFC operation, and also the production process of CL is of significant importance in terms of the cell performance as well as the system cost. The decal method has been used in the commercial production of CL in membrane electrode assemblies, in which the catalyst ink is prepared by mixing catalyst particles and ionomer in the solvent, coated on a decal substrate, dried to form a particulate layer with a specified thickness, and transferred to a membrane via hot pressing [1,2]. Since the three-phase interface (catalyst-void-ionomer) is essential for the mass transport during the electrochemical reaction, it is desirable to control the microstructure of CL [3]. Therefore, the catalyst ink and its use in the decal process should be studied in detail.

    We have developed a novel approach to investigate the characteristics of catalyst ink by using magnetic resonance imaging (MRI) combined with nuclear magnetic resonance (NMR) spectroscopy [4]. Although traditional NMR studies of ionomers have been reported [5,6], the detailed discussion regarding the spatial inhomogeneity of particles in catalyst ink and their dynamics during the drying process has been lacking. MRI enables us to visualize the spatial variations in the sample characteristics which cannot be accessed through other spectroscopy techniques [7]. In this study, we applied MRI and 1H/19F NMR to the catalyst ink for the decal process for gaining an insight on the dispersion state of catalyst and ionomer.

    Using the mixture of water and NPA as a dispersant, we prepared catalyst ink samples. We used platinum catalyst supported on carbon black (Pt/C) and Nafion dispersion D2020 (Chemours). Pre-mixing of catalyst ink was performed using ultrasonicaton to break large Pt/C agglomerates into smaller units. We then used a thin-film spin system high-speed mixer Filmix (Primix), which is designed for the production of slurries of nanometer-sized particles, in the main mixing process. Because Nafion works as a dispersant of Pt/C particles, the dispersion state of Nafion has an impact on the dispersibility of the Pt/C particles and eventually on the stability of catalyst ink. We conducted MRI/NMR measurements for the catalyst ink samples at each stage of preparation process to investigate changes in the dispersion state of Pt/C particles and Nafion.

    We found a fully-mixed sample exhibited a MRI image with submillimeter fine contrast because air bubbles were mixed in the sample during the main mixing process. It was difficult to remove air bubbles from the sample only by leaving it at rest for several hours. This observation was supported by the rheology measurement of catalyst ink. Hence we needed to use a magnetic stirrer to effectively perform the degassing of catalyst ink after the main mixing process. The degassed state of catalyst ink was confirmed by MRI image and 1H NMR spectrum. 19F NMR spectra showed remarkable changes concerning the peaks associated with the main and side chains of Nafion, which indicated the dispersion state of Nafion varied during the mixing process.

    In the present work, we have demonstrated that our experimental approach can provide a unique capability to investigate the dispersion state of catalyst ink. It is expected that the catalyst ink and its drying process will be investigated to optimize the fabrication process of PEFC catalyst layer.

    Acknowledgment:

    This study is based on the results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).

    References:

    [1] H.J. Cho et al., Int. J. Hydrogen Energy 36 (2011) 12465.

    [2] X. Liang et al., Fuel 139 (2015) 393.

    [3] N. Zamel, J. Power Sources 309 (2016) 141.

    [4] Y. Kameya et al., ECS Trans 75 (2016) 275.

    [5] S. Ma et al., Solid State Ionics 178 (2007) 1568.

    [6] C. Welch et al., ACS Macro Lett. 1 (2012) 1403.

    [7] M.H. Levitt, “Spin dynamics” 2nd edition, Wiley (2008).

    DOI: 10.1149/ma2017-02/35/1554

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  • Performance degradation of PEMFC by sea salt aerosol contamination Reviewed

    S. Uemura, M. Yamazaki, T. Yoshida, T. C. Jao, S. Hirai

    ECS Transactions   80 ( 8 )   651 - 655   2017

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    DOI: 10.1149/08008.0651ecst

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  • Visualization of Liquid Water Distribution at Interfaces of PEFC by Using Parallel-Beam Soft X-ray Radiography

    Naito, Hiroshi, Jao, Ting-Chu, Yoshida, Toshihiko, Sasabe, Takashi, Kawamura, Katsuyuki, Hirai, Shuichiro

    ECS Transactions   80 ( 8 )   425 - 431   2017

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  • Nanostructural evolution during catalyst layer formation studied via cryo-electron microscopy Reviewed

    Hidekazu Sugimori, Takeshi Terao, Yuri Nishino, Yoshiko Ito, Atsuo Miyazawa, Yuichi Konosu, Maito Koga, Hidetoshi Matsumoto, Suguru Uemura, Yuki Kameya, Takashi Sasabe, Toshihiko Yoshida, Kazuhiko Shinohara, Shuichiro Hirai

    ECS Transactions   80 ( 8 )   253 - 258   2017

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    DOI: 10.1149/08008.0253ecst

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  • Nanostructural Evolution during Catalyst Layer Formation Studied via Cryo-electron Microscopy

    Hidekazu Sugimori, Takeshi Terao, Yuri Nishino, Yoshiko Ito, Atsuo Miyazawa, Yuichi Konosu, Maito Koga, Hidetoshi Matsumoto, Suguru Uemura, Yuki Kameya, Takashi Sasabe, Toshihiko Yoshida, Kazuhiko Shinohara, Shuichiro Hirai

    POLYMER ELECTROLYTE FUEL CELLS 17 (PEFC 17)   80 ( 8 )   253 - 258   2017

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    DOI: 10.1149/08008.0253ecst

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  • Effects of O-2 Concentration and Precipitates on the Lithium Air Battery

    Suguru Uemura, Kosuke Torikai, Tomoaki Furuyama, Takashi Sasabe, Nobuyuki Imanishi, Shuichiro Hirai

    BEYOND LI-ION BATTERIES   75 ( 22 )   47 - 51   2017

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    DOI: 10.1149/07522.0047ecst

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  • Time-Resolved Nanostructural Analysis of Catalyst Layer Formation Process by Synchrotron X-ray Scattering

    Konosu, Yuichi, Koga, Maito, Matsumoto, Hidetoshi, Tokita, Masatoshi, Masunaga, Hiroyasu, Hikima, Takaaki, Sugimori, Hidekazu, Yoshida, Toshihiko, Shinohara, Kazuhiko, Hirai, Shuichiro

    ECS Transactions   80 ( 8 )   269 - 273   2017

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  • 低温排熱利用改質器におけるマイクロチャンネル内メタノール水溶液の相変化現象

    植村豪, 深井勝行, 田畑恵良, 平井秀一郎

    日本機械学会論文集   83 ( 846 )   00399 - 00399   2017

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  • Time lapse visualization of catalyst ink degradation by x-ray CT

    S. Uemura, Y. Kameya, N. Iriguchi, T. Yoshida, S. Hirai

    ECS Transactions   80 ( 8 )   403 - 407   2017

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    DOI: 10.1149/08008.0403ecst

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  • MRI and 1H/9F NMR investigation of dispersion state of PEFC catalyst ink

    Y. Kameya, N. Iriguchi, M. Ohki, K. Yokoyama, S. Sugawara, H. Sugimori, S. Uemura, T. Sasabe, T. Yoshida, S. Hirai

    ECS Transactions   80 ( 8 )   819 - 827   2017

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    DOI: 10.1149/08008.0819ecst

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  • Analysis of transport phenomenon in electrolyte by MRI tagging

    YOSHIMURA Shozo, YOSHIDA Toshihiko, UEMURA Suguru, IRIGUCHI Norio, KAMEYA Yuki, HIRAI Shuichiro

    The Proceedings of Mechanical Engineering Congress, Japan   2017   J0620105   2017

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    In order to improve the performance of electrochemical devices (e.g. electrolysis system, secondary battery), further understanding of ion transport phenomena is a crucial issue. In the electrochemical devices, the ions are transported by concentration diffusion, migration, and convection of electrolyte. While the concentration diffusion has been estimated experimentally in previous studies, the convection induced by transport of solvent ions has not been understood. This is because that the flow field structure of the actual electrolysis system is highly complex and velocity measurement of the actual system was difficult. In this paper, velocity distribution measurement within an operating electrolysis system was carried out by using magnetic resonance imaging (MRI) tagging method which is non-invasive and effective for visualization of fluid motion. And we structured two types of experimental cells to extract the effect of convection on the ion transport phenomena. As a result, the convection near the electrodes was visualized in three dimensions under constant voltage electrolysis, and importance of detailed understanding of convection behavior during the electrolysis process was suggested.

    DOI: 10.1299/jsmemecj.2017.j0620105

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  • Oxygen Concentration Measurement in the Porous Cathode of Lithium-air Battery by Fine Optical Fiber Sensor

    FUJIMOTO Shogo, UEMURA Suguru, IMANISHI Nobuyuki, HIRAI Shuichiro

    The Proceedings of Mechanical Engineering Congress, Japan   2017   J0620104   2017

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    Lithium-air battery attracts great attention because of its high energy density. However, low solubility of oxygen in aqueous electrolyte limits oxygen transport to the reaction site. To realize a more powerful aqueous lithium-air battery, it is necessary to clarify the oxygen transport phenomena in the porous cathode. In this study, we developed a measurement technique of oxygen concentration in the porous cathode under operating condition by inserting a fine optical fiber oxygen sensor. In this study, platinum tetrakis pentrafluoropheny porphine (PtTFPP) was employed as oxygen indicator. When the PtTFPP is exposed to excitation light, phosphorescence emission is produced, and its intensity depends on oxygen partial pressure. Thus, quantitative oxygen concentration can be obtained by measuring phosphorescence intensity and using calibration data. Fine optical fiber sensor (110 μm in diameter) was made with painting the PtTFPP on the edge. In the experimental setup, the porous cathode was fixed near electrolyte interface horizontally. The fine optical fiber sensor was put under the cathode in electrolyte, moved up and inserted in the cathode. The spatial and temporal oxygen concentration was measured with varying current density. According to experimental result, the existence of electrolyte between the air layer and the cathode inhabits oxygen transport.

    DOI: 10.1299/jsmemecj.2017.j0620104

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  • Investigation of porous structure formation of catalyst layers for proton exchange membrane fuel cells and their effect on cell performance

    Takahiro Suzuki, Hiroki Tanaka, Masanori Hayase, Shohji Tsushima, Shuichiro Hirai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   41 ( 44 )   20326 - 20335   2016.11

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    DOI: 10.1016/j.ijhydene.2016.09.078

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  • Injection of nanosized CO2 droplets as a technique for stable geological sequestration

    Suguru Uemura, Yohei Matsui, Fumiya Kondo, Shohji Tsushima, Shuichiro Hirai

    INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL   45   62 - 69   2016.2

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    DOI: 10.1016/j.ijggc.2015.12.011

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  • 高電場中におけるリチウム空気電池電解液の分子動力学解析

    植村豪, 落合譲司, 河村雄行, 平井秀一郎

    日本機械学会論文集   82 ( 837 )   00643 - 00643   2016

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  • Non-Destructive Optical Measurement of Oxygen Concentration on PEFC Catalyst layer

    Suguru Uemura, Toshihiko Yoshida, Ting-Chu Jao, Takashi Sasabe, Shuichiro Hirai

    POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)   75 ( 14 )   355 - 359   2016

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    DOI: 10.1149/07514.0355ecst

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  • Analysis study on dynamic wetting of water droplets for heat pipe performance enhancement

    Adisakpanichkij Papop, Uemura Suguru, Sasabe Takashi, Kawamura Katsuyuki, Hirai Shuichiro

    The Proceedings of the Thermal Engineering Conference   2016   A122   2016

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    Heat-transfer performance of the heat pipe is determined by dynamic wetting on the wall. In this study, an MD simulation of water droplet spreading on kaolinite wall: a material with both hydrophobic and hydrophilic surfaces, was conducted. We compared kinematic properties of water molecules near the contact line region when droplet is placed over the hydrophobic surface and the hydrophilic surface. As a result, different mechanisms of water molecules approaching the contact line region in the two cases were observed. The interaction between water molecule and wall was also analyzed in both cases.

    DOI: 10.1299/jsmeted.2016.a122

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  • Temperature and Humidification Effect on Mass Transfer of PEMFC via EIS and Soft X-ray Measurement

    T. -C. Jao, T. Sasabe, S. Uemura, T. Yoshida, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)   75 ( 14 )   179 - 188   2016

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    DOI: 10.1149/07514.0179ecst

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  • MRI Investigation of Local Diffusion Phenomena in PEFC Catalyst Ink

    Y. Kameya, N. Iriguchi, S. Uemura, T. Sasabe, T. Yoshida, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)   75 ( 14 )   275 - 280   2016

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    DOI: 10.1149/07514.0275ecst

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  • Time-Resolved Nanostructural Analysis of Thin-Film Formation Process from Nafion Solution by Synchrotron X-ray Scattering

    Y. Konosu, H. Masunaga, T. Hikima, M. Tokita, H. Matsumoto, T. Sasabe, T. Yoshida, K. Shinohara, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)   75 ( 14 )   637 - 642   2016

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    DOI: 10.1149/07514.0637ecst

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  • Oxygen concentration measurement at the PEFC catalyst layer by using a tiny optic fiber sensor

    UEMURA Suguru, YOSHIDA Toshihiko, JAO Ting-Chu, SASABE Takashi, HIRAI Shuichiro

    The Proceedings of the Thermal Engineering Conference   2016   B125   2016

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    Insufficient supply of oxygen (O2) to the cathode Pt catalyst layer can be caused by transport resistance, and is a major problem in proton exchange membrane fuel cells. To clarify O2 transport phenomena, a non-destructive technique for measuring the O2 concentration is required. In this study, the O2 concentration at the catalyst layer was measured under operating conditions, using a tiny optical fiber and oxygen indicator. The O2 concentration decreased continuously with decreasing cell voltage. It was considered that a decrease in size of the reaction area was caused by water accumulation and vapor generation. Local O2 concentration measurements suggested that power generation was concentrated at the limited region.

    DOI: 10.1299/jsmeted.2016.b125

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  • Investigation of gas generation in regenerative fuel cells by low-energy X-rays

    Omer Faruk Selamet, Phengxay Deevanhxay, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   296   133 - 141   2015.11

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    DOI: 10.1016/j.jpowsour.2015.07.043

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  • In Situ X-ray Visualization of the Lithiation Process in a Porous Graphite Electrode in an Operating Li-Ion Cell

    Shohji Tsushima, Weihao Hung, Phengxay Deevanhxay, Genki Kobayashi, Ryoji Kanno, Shuichiro Hirai

    CHEMELECTROCHEM   2 ( 10 )   1535 - 1540   2015.10

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    DOI: 10.1002/celc.201500141

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  • In-situ Three-dimensional Visualization of Precipitation Behavior in a Porous Air Electrode for Aqueous Lithium-air Battery

    Suguru Uemura, Tomoaki Furuyama, Tetsutaro Masuda, Shoji Tsushima, Nobuyuki Imanishi, Shuichiro Hirai

    ELECTROCHEMISTRY   83 ( 10 )   831 - 833   2015.10

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  • Analysis of so2 Contamination Effects on PEFC Performance and Water Distribution By in-Situ Soft X-Ray Microscopy

    Takashi Sasabe, Ting-Chu Jao, Takahiro Yamaguchi, Suguru Uemura, Shuichiro Hirai

    ECS Meeting Abstracts   MA2015-02 ( 37 )   1360 - 1360   2015.7

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    Durability is a major hindrance to the mass commercialization of polymer electrolyte fuel cell (PEFC) combined heat and power (CHP) systems and is adversely affected by contaminants. Fuel and air contaminants are major sources of contamination, and these contaminants cause performance degradation and irreversible damage to PEFCs. The performance degradation is manifested as kinetic, ohmic, and mass transfer losses. The most devastating consequence of fuel and air impurities in PEFCs is manifested as kinetic loss, and catalyst poisoning is the main cause of this phenomenon. The catalyst poisoning occurs when impurities adsorb on the surface of Platinum catalyst and blocks the active site of the catalyst. Ambient air is the most practical source of oxygen for PEFCs, but impurities in air can severely degrade PEFC performance, and the Sulfur contaminants, such as SOx, are the most detrimental to PEFCs [1]. From this background, extensive number of research for understanding and mitigating the catalyst poisoning has been carried out.

     The bipolar plate has the rib and the channel geometry in order to make electron transport pass to current collectors, to supply enough oxygen to the reaction site, and to remove water from the cathode catalyst layer (CL) to gas channels, and the transport of contaminants to the catalyst site is not uniform. Therefore, current density distribution in the rib/channel direction might be affected by the contamination, and the increase of local current density leads to water flooding in the CL. However, there are limited studies on the impacts of contamination distribution on current density distribution and mass transport loss.

     In this study, we focused on the influence of Sulfur dioxide (SO2) contamination on the cell performance. To clarify the effect of SO2contamination on the performance distribution, change of the liquid water distribution within the membrane electrode assembly (MEA) was quantitatively visualized by in-situ soft X-ray imaging technique, and the change of electrochemical surface area (ECSA) was evaluated.

     Figure 1 shows the change of cell voltage at the current density of 1.0 A/cm2 during continuous injection of SO2. The cell temperature was 80 deg.C, and the relative humidity was 80%. High purity H2 was used for the anode feed, and 1 ppm SO2/Air was used for the cathode feed. Severe voltage decay caused by SO2 was observed. Figure 2 shows the change of cyclic voltammograms (CV), and significant decrease of the H-adsorption/desorption currents were clearly observed. Figure 3 shows the results of the soft X-ray imaging. Fig. 3(a) shows the original image, and the cell structure was clearly visualized. Fig. 3(b) and Fig. 3(c) show the water extracted images before and during SO2 injection, respectively. Before SO2injection, liquid water accumulates under the rib area, and the decrease of liquid water under the rib near the channel was observed. In addition, slight increase of liquid water at the center part of the rib was also observed. These results suggest that the catalyst under the channel area is deactivated, and the catalyst under the rib is mainly used for power generation. It might affect the mass transport loss and becomes more important under high current density operation.

    Reference:

    [1] Yoshiki Nagahara, Seiho Sugawara, Kazuhiko Shinohara, The impact of air contaminants on PEMFC performance and durability, J. Power Sources, 182, 422-428 (2008)

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  • Impacts of channel wettability and flow direction on liquid water transport in the serpentine flow field of a polymer electrolyte fuel cell

    Kosuke Nishida, Ryo Taniguchi, Yugo Ishizaki, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   275   447 - 457   2015.2

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  • An overview of cracks and interfacial voids in membrane electrode assemblies in polymer electrolyte fuel cells

    Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   10 ( 1 )   JTST0002 - JTST0002   2015

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  • Molecular Analysis of Electrolyte for Lithium-Air Batteryby MD Simulations

    Suguru UEMURA, George OCHIAI, Katsuyuki KAWAMURA, Shuichiro HIRAI

    Journal of Computer Chemistry, Japan   14 ( 5 )   164 - 171   2015

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    DOI: 10.2477/jccj.2015-0019

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  • Hydrophobic Gas-Diffusion Media for Polymer-Electrolyte Fuel Cells by Direct Fluorination

    Trung Van Nguyen, Azita Ahosseini, Xuhai Wang, Venkata Yarlagadda, Anthony Kwong, Adam Z. Weber, Phengxay Deevanhxay, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   162 ( 14 )   F1451 - F1460   2015

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    DOI: 10.1149/2.0411514jes

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  • In-situ Visualization for Anion Exchange Membrane Fuel Cells Using Hydrazine Hydrate as a Fuel by Soft X-ray Radiography

    46 ( 3 )   621 - 626   2015

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  • Real-time visualization of enhanced oil recovery process by using three-phase refractive index matching

    80 ( 3 )   187 - 194   2015

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  • Visualization of precipitation behavior in an aqueous lithium-air battery electrode by a soft X-ray CT

    T. Masuda, S. Uemura, S. Tsushima, N. Imanishi, S. Hirai

    ECS Transactions   64 ( 19 )   47 - 62   2015

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    DOI: 10.1149/06419.0047ecst

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  • 水系リチウム空気電池の多孔質電極内固相析出 in-situ 三次元可視化

    UEMURA, Suguru, FURUYAMA, Tomoaki, MASUDA, Tetsutaro, TSUSHIMA, Shoji, IMANISHI, Nobuyuki, HIRAI, Shuichiro

    Electrochemistry   83 ( 10 )   831 - 833   2015

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  • MIGRATION AND TRAPPING PHENOMENA OF BUOYANCY-DRIVEN CO2 IN WATER-SATURATED POROUS MEDIA USING LATTICE BOLTZMANN METHOD

    Suguru Uemura, Atsuto Noda, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POROUS MEDIA   18 ( 1 )   79 - 88   2015

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    DOI: 10.1615/JPorMedia.v18.i1.70

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  • Reaction and mass transport simulations by LBM in electrolyte of aqueous lithium-air battery

    K. Shibata, S. Uemura, S. Tsushima, S. Hirai

    ECS Transactions   64 ( 19 )   39 - 46   2015

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    DOI: 10.1149/06419.0039ecst

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  • Oblique Soft X-Ray Tomography as a Non-Destructive Method for Morphology Diagnostics in Degradation of Proton-Exchange Membrane Fuel Cell

    Phengxay Deevanhxay, Takashi Sasabe, Katsunori Minami, Shohji Tsushima, Shuichiro Hirai

    ELECTROCHIMICA ACTA   135   68 - 76   2014.7

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    DOI: 10.1016/j.electacta.2014.04.144

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  • In-situ visualization of N-2 evolution in operating direct hydrazine hydrate fuel cell by soft X-ray radiography

    Tomokazu Sakamoto, Phengxay Deevanhxay, Koichiro Asazawa, Shohji Tsushima, Shuichiro Hirai, Hirohisa Tanaka

    JOURNAL OF POWER SOURCES   252   35 - 42   2014.4

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    DOI: 10.1016/j.jpowsour.2013.11.108

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  • Analysis of Molecular Dynamics of CO2/Oil DissolutionPhenomena in Enhanced Oil Recovery

    UEMURA, Suguru, ODERA, Atsushi, TSUSHIMA, Shohji, KAWAMURA, Katsuyuki, HIRAI, Shuichiro

    Journal of Computer Chemistry, Japan   13 ( 3 )   196 - 198   2014

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  • CO<inf>2</inf> trapping phenomena in porous media of geological storage by Lattice Boltzmann method Reviewed

    Suguru Uemura, Atsuto Noda, Shohji Tushima, Shuichiro Hirai

    Proceedings of the 15th International Heat Transfer Conference, IHTC 2014   2014

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  • Efficient utilization of the electrodes in a redox flow battery by modifying flow field and electrode morphology

    Tsushima, Shohji, Kondo, Fumiya, Sasaki, Sho, Hirai, Shuichiro

    International Heat Transfer Conference Digital Library   2014

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  • 原油増進回収における CO 2/油系溶解現象の分子動力学解析

    植村豪, 小寺厚, 津島将司, 河村雄行, 平井秀一郎

    Journal of Computer Chemistry, Japan   13 ( 3 )   196 - 198   2014

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  • In situ Soft X-ray Visualization of Liquid Water distribution in a PEMFC with VGCF-Modified MPL

    T. -C. Jao, T. Sasabe, P. Deevanhxay, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 14   64 ( 3 )   829 - 838   2014

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    DOI: 10.1149/06403.0829ecst

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  • Visualization of O-2 on Aqueous Li-air Battery by Using Microfocus X-ray CT

    S. Uemura, S. Tsushima, N. Imanishi, S. Hirai

    BATTERY CHEMISTRIES BEYOND LITHIUM ION   58 ( 12 )   15 - 20   2014

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    DOI: 10.1149/05812.0015ecst

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  • Effects of Channel Structure and Wettability on Liquid Water Transport in the Cathode of a Polymer Electrolyte Fuel Cell

    Yugo Ishizaki, Kosuke Nishida, Shohji Tsushima, Shuichiro Hirai

    KAGAKU KOGAKU RONBUNSHU   40 ( 4 )   320 - 326   2014

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    DOI: 10.1252/kakoronbunshu.40.320

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  • Cross-Sectional Visualization of Liquid Water Behavior and Evaluation of Wettability Effect in Cathode Channel of an Operating PEFC

    K. Nishida, T. Muranishi, Y. Ishizaki, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 14   64 ( 3 )   853 - 862   2014

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    DOI: 10.1149/06403.0853ecst

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  • 固体高分子形燃料電池の流路構造および壁面濡れ性がカソード内液水輸送に与える影響

    石崎勇吾, 西田耕介, 津島将司, 平井秀一郎

    化学工学論文集   40 ( 4 )   320 - 326   2014

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  • Development of Soft X-ray Radiography for In situ Diagnostic of Liquid Water in Polymer Electrolyte Membrane Fuel Cells

    DEEVANHXAY Phengxay, TSUSHIMA Shohji, HIRAI Shuichiro

    Journal of the Japan Institute of Energy   93 ( 1 )   29 - 34   2014

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    In this review, development of soft X-ray radiography is described as a diagnostic tool to elucidate liquid water transport in polymer electrolyte membrane fuel cells (PEFCs). Soft X-ray radiography allows liquid water detection with high sensitivity. The combination of soft X-ray radiography and special designed fuel cell made the observation of liquid water in PEFC at micro scale possible. Diagnostic of through-plane liquid water distribution and liquid water transport paths in gas diffusion layer with microporous layer was demonstrated. In addition, investigation on the effect of liquid water distribution on cell performance at practical operating temperature was also presented. Soft X-ray radiography has great potential in observation of liquid water in PEFC at high spatial and temporal resolution.

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  • Use of Carbon Dioxide in Enhanced Oil Recovery and Carbon Capture and Sequestration

    Uemura, Suguru, Tsushima, Shohji, Hirai, Shuichiro

    Green Carbon Dioxide: Advances in CO2 Utilization   287 - 300   2014

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  • Accuracy of equilibrium magnetization mapping in sliced two-dimensional spoiled gradient-recalled echo pulse sequence with variable flip angle

    Hideto Kuribayashi, Masaki Sekino, Takuya Minowa, Yoshie Maitani, Hiroyuki Ohsaki, Shohji Tsushima, Shuichiro Hirai, Masayuki Ueda, Yasuo Katayama

    Journal of Magnetic Resonance Imaging   38 ( 5 )   1245 - 1250   2013.11

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    DOI: 10.1002/jmri.24023

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  • Effect of liquid water distribution in gas diffusion media with and without microporous layer on PEM fuel cell performance

    Phengxay Deevanhxay, Takashi Sasabe, Shohji Tsushima, Shuichiro Hirai

    ELECTROCHEMISTRY COMMUNICATIONS   34   239 - 241   2013.9

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    DOI: 10.1016/j.elecom.2013.07.001

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  • Quantitative estimation of water vapor distribution in low-humidity proton exchange membrane fuel cell using humidity test paper

    Kosuke Nishida, Yoma Yokoi, Masaya Asa, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   234   111 - 118   2013.7

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    DOI: 10.1016/j.jpowsour.2013.01.160

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  • Observation of dynamic liquid water transport in the microporous layer and gas diffusion layer of an operating PEM fuel cell by high-resolution soft X-ray radiography

    Phengxay Deevanhxay, Takashi Sasabe, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   230   38 - 43   2013.5

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    DOI: 10.1016/j.jpowsour.2012.11.140

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  • Crack generation in catalyst layer and micro porous layer by wet-dry cycles and its impact on PEMFC performance Reviewed

    Y. Matsui, T. Suzuki, P. Deevanhxay, S. Tsushima, S. Hirai

    ASME 2013 11th Int. Conf. on Fuel Cell Science, Eng. and Technology Collocated with the ASME 2013 Heat Transfer Summer Conf. and the ASME 2013 7th Int. Conf. on Energy Sustainability, FUELCELL 2013   2013

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    DOI: 10.1115/FuelCell2013-18099

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  • Measurement of buoyancy driven CO<inf>2</inf> in a porous media by x-ray computed tomography Reviewed

    Suguru Uemura, Yudai Suzuki, Ryoto Kataoka, Shohji Tsushima, Shuichiro Hirai

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   79 ( 806 )   2275 - 2288   2013

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    DOI: 10.1299/kikaib.79.2275

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  • Effects of channel structure and wettability on liquid water transport in cathode of PEFC

    Y. Ishizaki, R. Taniguchi, K. Nishida, S. Tsushima, S. Hirai

    ECS Transactions   50 ( 2 )   375 - 384   2013

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    DOI: 10.1149/05002.0375ecst

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  • Measurements of water vapor and current distributions and prediction of water crossover in PEMFC under low-humidity conditions

    K. Nishida, M. Asa, S. Tsushima, S. Hirai

    ECS Transactions   50 ( 2 )   279 - 289   2013

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    DOI: 10.1149/05002.0279ecst

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  • Effect of perforation structure of cathode GDL on liquid water removal in PEFC

    G. Okuhata, T. Tonoike, K. Nishida, S. Tsushima, S. Hirai

    ECS Transactions   58 ( 1 )   1047 - 1057   2013

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    DOI: 10.1149/05801.1047ecst

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  • Investigation of liquid water accumulation in operating PEM fuel cells with/without MPL and its effect on cell performance

    P. Deevanhxay, T. Sasabe, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 13 (PEFC 13)   58 ( 1 )   337 - 344   2013

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    DOI: 10.1149/05801.0337ecst

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  • PERFORMANCE IMPROVEMENT IN REDOX FLOW BATTERY WITH FLOW-THROUGH CHANNEL GEOMETRY Reviewed

    Shohji Tsushima, Sho Sasaki, Takahiro Suzuki, Phengxay Deevanhxay, Shuichiro Hirai

    PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS, 2013   2013

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  • Visualization of Liquid Water Accumulation in PEMFCs Operating at Different Temperatures by Soft X-ray Radiography

    Deevanhxay, Phengxay, Sasabe, Takashi, Tsushima, Shohji, Hirai, Shuichiro

    ECS Transactions   50 ( 2 )   335 - 341   2013

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  • Analysis of Molecular Dynamics of CO2/Oil DissolutionPhenomena in Enhanced Oil Recovery

    UEMURA Suguru, ODERA Atsushi, TSUSHIMA Shohji, KAWAMURA Katsuyuki, HIRAI Shuichiro

    Journal of Chemical Software   12 ( 4 )   222 - 229   2013

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    Carbon dioxide enhanced oil recovery (CO2-EOR) is a technique to recover the residual oil from oil reservoirs by injection of CO2. CO2 dissolution causes changes in the physical-chemical properties of oil, resulting in improvement in the oil recovery efficiency. However, the fundamental dissolution mechanism is not clear. To clarify it, we have investigated CO2 dissolution phenomena in cyclohexane (C6H12) using molecular dynamics simulations. The results show that CO2 dissolves in C6H12 by forming a cluster structure. The dissolution state of CO2 in C6H12 is discussed by comparing with the dissolution state of H2O in C6H12, and the electric fields around CO2, H2O, and C6H12 are analyzed from the viewpoint of molecular polarity and coulomb interactions. As a result, the CO2 dissolution state with cluster formation is considered to be strongly dominated by the similarity of the shape and size of the electric fields around CO2 and C6H12.

    DOI: 10.2477/jccj.2013-0017

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  • Microscopic Analysis of Interlayer Structure and Oxygen Transport Behaviors in Porous Electrode in PEMFC

    T. Suzuki, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 13 (PEFC 13)   58 ( 1 )   489 - 494   2013

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    DOI: 10.1149/05801.0489ecst

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  • 多孔質内浮力駆動 CO2 の X 線 CT 計測

    植村豪, 鈴木雄大, 片岡亮人, 津島将司, 平井秀一郎

    日本機械学会論文集 B 編   79 ( 806 )   2275 - 2288   2013

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  • Effects of Channel Structure and Wettability on Liquid Water Transport in Cathode of PEFC

    Ishizaki, Yugo, Taniguchi, Ryo, Nishida, Kosuke, Tsushima, Shohji, Hirai, Shuichiro

    ECS Transactions   50 ( 2 )   375 - 384   2013

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  • Structural Control and Evaluation of PEMFC Catalyst Layers by Blending Platinum-Supported/Stand-Alone Carbon Black

    Suzuki, Takahiro, Tsushima, Shohji, Hirai, Shuichiro

    ECS Transactions   50 ( 2 )   1467 - 1473   2013

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  • In Situ Water Distribution Visualization in MEA by Soft X-ray Radiography

    Tsushima, Shohji, Deevanhxay, Phengxay, Sasabe, Takashi, Hirai, Shuichiro

    ECS Transactions   50 ( 2 )   327 - 333   2013

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  • Visualization of gas bubble behavior of a Regenerative fuel cell in electrolysis mode by soft X-ray radiography

    O. F. Selamet, P. Deevanhxay, S. Tsushima, S. Hirai

    ECS Transactions   58 ( 1 )   353 - 360   2013

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    DOI: 10.1149/05801.0353ecst

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  • Measurements of Water Vapor and Current Distributions and Prediction of Water Crossover in PEMFC under Low-Humidity Conditions

    Nishida, Kosuke, Asa, Masaya, Tsushima, Shohji, Hirai, Shuichiro

    ECS Transactions   50 ( 2 )   279 - 289   2013

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  • Separation analysis of electro-osmosis and diffusion of water in electrolyte membrane of PEMFC under low-humidity operation

    K. Nishida, T. Hosotani, M. Asa, S. Tsushima, S. Hirai

    ECS Transactions   58 ( 1 )   621 - 630   2013

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    DOI: 10.1149/05801.0621ecst

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  • High-Resolution X-Ray Computed Tomography of Liquid CO2 Permeation in Water-Saturated Sandstone

    Suguru Uemura, Ryoto Kataoka, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   8 ( 1 )   152 - 164   2013

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    DOI: 10.1299/jtst.8.152

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  • Fabrication and performance evaluation of structurally-controlled PEMFC catalyst layers by blending platinum-supported and stand-alone carbon black

    Takahiro Suzuki, Shohji Tsushima, Shuichiro Hirai

    Journal of Power Sources   233   269 - 276   2013

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    DOI: 10.1016/j.jpowsour.2013.01.092

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  • Nanosized CO2 droplets injection for stable geological storage

    Suguru Uemura, Yohei Matsui, Atsuto Noda, Shohji Tsushima, Shuichiro Hirai

    Energy Procedia   37   5596 - 5600   2013

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    DOI: 10.1016/j.egypro.2013.06.481

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  • Investigation on Effect of PTFE Treatment on GDL Micro-structure by High-resolution X-ray CT

    Sasabe, Takashi, Inoue, Gen, Tsushima, Shohji, Hirai, Shuichiro, Tokumasu, Takashi, Pasaogullari, Ugur

    ECS Transactions   50 ( 2 )   735 - 744   2013

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  • In situ diagnostic of liquid water distribution in cathode catalyst layer in an operating PEMFC by high-resolution soft X-ray radiography

    Phengxay Deevanhxay, Takashi Sasabe, Shohji Tsushima, Shuichiro Hirai

    ELECTROCHEMISTRY COMMUNICATIONS   22   33 - 36   2012.8

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    DOI: 10.1016/j.elecom.2012.05.028

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  • Detection of water vapor in cathode gas diffusion layer of polymer electrolyte fuel cell using water sensitive paper

    Kosuke Nishida, Motoyuki Ishii, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   199   155 - 160   2012.2

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    DOI: 10.1016/j.jpowsour.2011.10.026

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  • Visualization of CO2 geological storage by using a microfocus X-ray CT

    UEMURA, Suguru, TSUSHIMA, Shohji, HIRAI, Shuichiro

    Journal of the Visualization Society of Japan   32 ( 126 )   2012

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  • Influence of SO2 Concentration and Relative Humidity on Electrode Poisoning in Polymer Electrolyte Membrane Fuel Cells

    Shohji Tsushima, Keisuke Kaneko, Hiroyuki Morioka, Shuichiro Hirai

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   7 ( 4 )   619 - 632   2012

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    DOI: 10.1299/jtst.7.619

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  • マイクロフォーカス X 線 CT を用いた多孔質内 CO2 浸透挙動の可視化解析

    植村豪, 深堀大地, 津島将司, 平井秀一郎

    日本機械学会論文集 B 編   78 ( 785 )   74 - 82   2012

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  • マイクロフォーカス X 線 CT による CO 2 地中隔離の可視化解析

    植村豪, 津島将司, 平井秀一郎

    可視化情報学会誌   32 ( 126 )   2012

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  • マイクロフォーカス X 線 CT による CO 地中隔離の可視化解析 (特集 混相流)

    植村豪, 津島将司, 平井秀一郎

    可視化情報学会誌   32 ( 126 )   98 - 03   2012

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  • G124 A numerical study of lbuoyancy-drivent CO_2 in CCS

    Iwamoto Yuki, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    The Proceedings of the Thermal Engineering Conference   2012   211 - 212   2012

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    CCS is considered as an effective technology to reduce CO_2 emissions into the atmosphere. Geological sequestration is an immediately available and technologically feasible method, however, upward migration of CO_2 is caused by buoyance. The evaluation of the storage site and the assessment of CO_2 leakage risks and storage costs are needed. To clarify the behavior of CO_2 migration, we studied fundamental liquid CO_2/water two-phase flow in a porous media. One dimensional distribution of CO_2 saturation and its time evolution were simulated. Necessity of considering the pressure loss in both phases was discussed.

    DOI: 10.1299/jsmeted.2012.211

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  • Visualization and analysis of CO 2 permeation process in a porous media by microfocus X-ray computed tomography Reviewed

    Suguru Uemura, Daichi Fukabori, Shohji Tsushima, Shuichiro Hirai

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   78 ( 785 )   74 - 82   2012

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    DOI: 10.1299/kikaib.78.74

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  • SOFT X-RAY INVESTIGATION ON THE EFFECT OF MICROSTRUCTURE OF PEMFC POROUS LAYERS ON LIQUID WATER TRANSPORT Reviewed

    Takashi Sasabe, Phengxay Deevanhxay, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME 9TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY 2011   163 - 169   2012

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  • Structural control and evaluation of PEMFC catalyst layers by blending platinum-supported/stand-alone carbon black Reviewed

    T. Suzuki, S. Tsushima, S. Hirai

    ECS Transactions   50 ( 2 )   1467 - 1473   2012

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    DOI: 10.1149/05002.1467ecst

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  • EFFECTS OF WETTABILITY AND FLOW DIRECTION OF CATHODE CHANNEL ON PLUGGING PHENOMENON IN POLYMER ELECTROLYTE FUEL CELL Reviewed

    Ryo Taniguchi, Kosuke Nishida, Hisashi Kamada, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME 9TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY 2011   181 - 186   2012

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  • Investigation on the effect of microstructure of proton exchange membrane fuel cell porous layers on liquid water behavior by soft X-ray radiography

    Takashi Sasabe, Phengxay Deevanhxay, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   196 ( 20 )   8197 - 8206   2011.10

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    DOI: 10.1016/j.jpowsour.2011.05.045

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  • Effects of Nafion (R) ionomer and carbon particles on structure formation in a proton-exchange membrane fuel cell catalyst layer fabricated by the decal-transfer method

    Takahiro Suzuki, Shohji Tsushima, Shuichiro Hirai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   36 ( 19 )   12361 - 12369   2011.9

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    DOI: 10.1016/j.ijhydene.2011.06.090

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  • Investigation of water accumulation and discharge behaviors with variation of current density in PEMFC by high-resolution soft X-ray radiography

    Phengxay Deevanhxay, Takashi Sasabe, Shohji Tsushima, Shuichiro Hirai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   36 ( 17 )   10901 - 10907   2011.8

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    DOI: 10.1016/j.ijhydene.2011.05.160

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  • Soft X-ray visualization of the liquid water transport within the cracks of micro porous layer in PEMFC

    Takashi Sasabe, Phengxay Deevanhxay, Shohji Tsushima, Shuichiro Hirai

    ELECTROCHEMISTRY COMMUNICATIONS   13 ( 6 )   638 - 641   2011.6

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    DOI: 10.1016/j.elecom.2011.03.033

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  • Measurement of water content distribution in catalyst coated membranes under water permeation conditions by magnetic resonance imaging

    Takahiro Suzuki, Yuichiro Tabuchi, Shohji Tsushima, Shuichiro Hirai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   36 ( 9 )   5479 - 5486   2011.5

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    DOI: 10.1016/j.ijhydene.2011.01.162

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  • In situ diagnostics for water transport in proton exchange membrane fuel cells

    Shohji Tsushima, Shuichiro Hirai

    PROGRESS IN ENERGY AND COMBUSTION SCIENCE   37 ( 2 )   204 - 220   2011.4

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  • Analysis of in situ water transport in Nafion (R) by confocal micro-Raman spectroscopy

    Yuichiro Tabuchi, Rei Ito, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF POWER SOURCES   196 ( 2 )   652 - 658   2011.1

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    DOI: 10.1016/j.jpowsour.2010.07.078

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  • MEASUREMENT OF WATER, TEMPERATURE AND CURRENT DISTRIBUTIONS IN ANODE OF POLYMER ELECTROLYTE FUEL CELL DURING LOW HUMIDITY OPERATION Reviewed

    Kosuke Nishida, Yoma Yokoi, Kazumasa Umeda, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011, VOL 2   475 - +   2011

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  • Experiment on liquid and supercritical CO2 distribution using micro-focus X-ray CT for estimation of geological storage

    Suguru Uemura, Ryoto Kataoka, Daichi Fukabori, Shohji Tsushima, Shuichiro Hirai

    10TH INTERNATIONAL CONFERENCE ON GREENHOUSE GAS CONTROL TECHNOLOGIES   4   5102 - 5107   2011

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    DOI: 10.1016/j.egypro.2011.02.485

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  • SIGNIFICANCE OF MICRO-SCALE MASS TRANSPORT PHENOMENA ON FUEL CELLS AND CO2 SEQUESTRATION Reviewed

    Shuichiro Hirai, Shohji Tsushima, Suguru Uemura

    PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011, VOL 3   731 - 738   2011

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  • INVESTIGATION OF LIQUID WATER BEHAVIORS IN CARBON PAPER GDL FOR PEMFCS BY SOFT X-RAY RADIOGRAPHY Reviewed

    Shohji Tsushima, Takashi Sasabe, Shuichiro Hirai

    PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011, VOL 2   437 - 441   2011

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  • Study on Structure Design of Gas Diffusion Layer and Effective Water Removal in Cathode of PEFC

    Tonoike Takeshi, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2011   156 - 156   2011

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    DOI: 10.11368/nhts.2011.0.156.0

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  • Molecular dynamics simulations of CO2 dissolution phenomena

    ODERA Atsushi, HIRAI Shuichiro, UEMURA Suguru, TSUSHIMA Shohji, KAWAMURA Katsuyuki

    Proceedings of National Heat Transfer Symposium   2011   123 - 123   2011

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    DOI: 10.11368/nhts.2011.0.123.0

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  • Oil/supercritical CO2 dissolution phenomena based on density/concentration measurements under high pressure

    Hirai Shuichiro, Ito Rei, Uemura Suguru, Tsushima Shoji, Harada Makoto

    Proceedings of National Heat Transfer Symposium   2011   8 - 8   2011

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    DOI: 10.11368/nhts.2011.0.8.0

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  • Effect of Wettability of Cathode Channel on Liquid Water Drainage in PEFC

    Taniguchi Ryo, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2011   270 - 270   2011

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    DOI: 10.11368/nhts.2011.0.270.0

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  • X-ray CT of buoyancy driven flow in a porous media for CO2 geological sequestration

    Uemura Suguru, Kataoka Ryoto, Suzuki Yudai, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2011   32 - 32   2011

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    DOI: 10.11368/nhts.2011.0.32.0

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  • 氷点下起動時における固体高分子形燃料電池カソード電極内の水分凍結挙動の可視化計測

    西田耕介, 伊藤寛和, 津島将司, 平井秀一郎

    化学工学論文集   37 ( 1 )   57 - 63   2011

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  • In-situ Visualization of Water in an Operating PEFC by Magnetic Resonance Imaging and Soft X-ray Radiography

    TSUSHIMA, Shohji, HIRAI, Shuichiro

    Journal of the Visualization Society of Japan   31 ( 123 )   144 - 148   2011

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  • Investigation of water-molecule network in hydrated polymer electrolyte membranes by Raman Spectroscopy: Effect of polymer structure and cation impregnation

    S. Tsushima, Y. Iwamoto, A. Horai, Y. Tabuchi, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 11   41 ( 1 )   1407 - 1411   2011

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    DOI: 10.1149/1.3635671

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  • Visualization Measurement of Water Freezing in the Cathode of a Polymer Electrolyte Fuel Cell during Cold Startup

    Kosuke Nishida, Hirokazu Ito, Shohji Tsushima, Shuichiro Hirai

    KAGAKU KOGAKU RONBUNSHU   37 ( 1 )   57 - 63   2011

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  • Liquid Water Visualization in Cathode Catalyst Layer of PEMFC by Soft X-ray Radiography

    P. Deevanhxay, T. Sasabe, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 11   41 ( 1 )   403 - 408   2011

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    DOI: 10.1149/1.3635574

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  • Pore Structure and Cell Performance Analysis of PEMFC Catalyst Layers Fabricated by Decal Transfer Method with Variation of Hot Pressing Pressure

    T. Suzuki, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 11   41 ( 1 )   909 - 914   2011

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    DOI: 10.1149/1.3635625

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  • Image Measurement of Water Droplets in Cathode of PEFC Based on Background Subtraction Method

    K. Nishida, S. Tanaka, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 11   41 ( 1 )   419 - 428   2011

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    DOI: 10.1149/1.3635576

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  • Effects of a Microporous Layer and the Gas Flow Configuration on Through-Plane Water Transport in a Polymer Electrolyte Membrane Fuel Cell

    FUJII Yoshinobu, SASABE Takashi, TSUSHIMA Shohji, HIRAI Shuichiro

    JTST   6 ( 3 )   475 - 485   2011

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    We investigated the effects of the microporous layer (MPL) and the gas flow configuration on water transport in an operating polymer electrolyte membrane fuel cell by means of tunable diode-laser absorption spectroscopy (TDLAS). TDLAS, which permits optical remote sensing of the distribution of the water vapor concentration along a channel, was used to examine local through-plane water transport across the membrane electrode assembly (MEA). TDLAS observations showed that an MPL at the cathode side enhances back-transport of water generated at the cathode to the anode under conditions of low relative humidity in both co-flow and counter-flow configurations, because it acts as a mass-transport resistance in the MEA. We also showed that the counter-flow configuration established an internal circulation of water in the fuel cell.

    DOI: 10.1299/jtst.6.475

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  • In-situ Measurement of Flow Velocity in Gas Channel in a PEMFC by Laser Ablation Tagging Visualization

    D. Fukabori, S. Hirai, S. Tsushima, K. Nishida

    POLYMER ELECTROLYTE FUEL CELLS 11   41 ( 1 )   561 - 567   2011

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    DOI: 10.1149/1.3635589

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  • In-situ visualization of liquid water in an operating PEMFC by soft X-ray radiography

    Takashi Sasabe, Shohji Tsushima, Shuichiro Hirai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   35 ( 20 )   11119 - 11128   2010.10

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    DOI: 10.1016/j.ijhydene.2010.06.050

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  • Measurement of liquid water content in cathode gas diffusion electrode of polymer electrolyte fuel cell

    Kosuke Nishida, Takeshi Murakami, Shohji Tsushima, Shuichiro Hirai

    Journal of Power Sources   195 ( 11 )   3365 - 3373   2010.6

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    DOI: 10.1016/j.jpowsour.2009.12.073

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  • In situ Diagnostics of Water in Polymer Electrolyte Fuel Cells for Water Transport Analysis

    Shohji Tsushima, Shuichiro Hirai

    BUNSEKI KAGAKU   59 ( 1 )   1 - 11   2010.1

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  • IN-SITU OBSERVATION OF THE WATER DISTRIBUTION IN POROUS LAYERS OF PEMFCS BY SOFT X-RAY RADIOGRAPHY Reviewed

    Takashi Sasabe, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME 8TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY 2010, VOL 1   175 - 181   2010

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  • X-RAY COMPUTED TOMOGRAPHY OF CO2 BEHAVIOR IN WATER SATURATED SANDSTONE FOR GEOLOGICAL STORAGE Reviewed

    Suguru Uemura, Ryoto Kataoka, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME INTERNATIONAL HEAT TRANSFER CONFERENCE - 2010, VOL 6   967 - 973   2010

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  • Prediction of reaction distribution in anode electrode of low humidity PEFC

    YOKOI Yoma, UMEDA Kazumasa, NISHIDA Kosuke, TSUSHIMA Shohji, HIRAI Shuichiro

    Proceedings of National Heat Transfer Symposium   2010   5 - 5   2010

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    DOI: 10.11368/nhts.2010.0.5.0

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  • Evaluation of MPL effect on water transport in cathode electrode of PEFC

    TANIGUCHI Ryo, NISHIDA Kosuke, TSUSHIMA Shohji, HIRAI Shuichiro

    Proceedings of National Heat Transfer Symposium   2010   257 - 257   2010

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    DOI: 10.11368/nhts.2010.0.257.0

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  • 4-5-3 Investigation of Contamination and Performance Degradation by SO_2 supply in the Cathode Air Stream in PEFC

    KITAMURA Fusao, Osaka Takeo, KANEKO Keisuke, TSUSHIMA Shohji, HIRAI Shuichiro

    Proceedings of the Annual Conference of The Japan Institute of Energy   19   252 - 253   2010

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    Investigation of sulfur dioxide (SO_2) on contamination of the PEFC electrodes and resultant cell performance degradation has been performed by an accelerated degradation test of a single cell and electrochemical diagnostics on model electrodes. It was revealed that two-stage degradation on cell performance by SO2 supply and was presumably caused, depending on the electrode potential. A possible electrochemical reaction to induce this degradation was proposed as sulfur formation process on the catalyst.

    DOI: 10.20550/jietaikaiyoushi.19.0_252

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  • Lattice Boltzmann simulation on particle transport and captured behaviors in a 3D-reconstructed micro porous DPF Reviewed

    Shohji Tsushima, Issei Nakamura, Satoshi Sakashita, Shuichiro Hirai, Daisuke Kitayama

    SAE Technical Papers   2010

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    DOI: 10.4271/2010-01-0534

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  • Measurement of CO2 geological Storage by using high spacial resolution X-ray computed tomography

    Fukabori Daichi, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2010   63 - 63   2010

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    DOI: 10.11368/nhts.2010.0.63.0

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  • X-ray computed tomography of supercritical and liquid CO2 in a sandstone at high pressure: Analysis and visualization for CO2 behavior in geological storage

    Uemura Suguru, Kataoka Ryoto, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2010   64 - 64   2010

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    DOI: 10.11368/nhts.2010.0.64.0

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  • Characterization of the PEMFC Catalyst Layer by Cross-sectional Visualization and Performance Evaluation

    T. Suzuki, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 10, PTS 1 AND 2   33 ( 1 )   1465 - 1470   2010

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    DOI: 10.1149/1.3484639

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  • QUANTITATIVE EVALUATION OF LIQUID WATER AT CATHODE INTERFACE OF POLYMER ELECTROLYTE FUEL CELL USING NEAR-INFRARED REFLECTANCE SPECTROSCOPY Reviewed

    Kosuke Nishida, Motoyuki Ishii, Ryo Taniguchi, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME 8TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY 2010, VOL 1   99 - 106   2010

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  • Investigation of Water Distribution in a Membrane in an Operating PEMFC by Environmental MRI

    S. Tsushima, T. Ikeda, T. Koido, S. Hirai

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   157 ( 12 )   B1814 - B1818   2010

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    DOI: 10.1149/1.3486168

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  • Two-stage Degradation of PEMFC Performance Due to Sulfur Dioxide Contamination

    S. Tsushima, K. Kaneko, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 10, PTS 1 AND 2   33 ( 1 )   1645 - 1652   2010

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    DOI: 10.1149/1.3484654

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  • MEASUREMENT OF WATER CONTENT DISTRIBUTION IN CATALYST COATED MEMBRANE AT WATER PERMEATION CONDITION BY MAGNETIC RESONANCE IMAGING Reviewed

    Takahiro Suzuki, Yuichiro Tabuchi, Shohji Tsushima, Shuichiro Hirai, Koichiro Aotani, Norio Kubo

    PROCEEDINGS OF THE ASME 8TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY 2010, VOL 1   183 - 188   2010

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  • Analysis of State of Water in Polymer Electrolyte Membrane by Raman Spectroscopy and DFT

    Y. Tabuchi, R. Ito, S. Tsushima, S. Hirai, A. Horai, K. Aotani, N. Kubo, K. Shinohara

    POLYMER ELECTROLYTE FUEL CELLS 10, PTS 1 AND 2   33 ( 1 )   1045 - +   2010

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    DOI: 10.1149/1.3484598

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  • Measurement of liquid water content in cathode gas diffusion electrode of polymer electrolyte fuel cell

    Nishida, Kosuke, Murakami, Takeshi, Tsushima, Shohji, Hirai, Shuichiro

    Journal of Power Sources   195 ( 11 )   3365 - 3373   2010

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  • High-resolution Visualization of Water Accumulation Behavior in an Operating PEMFC by Soft X-ray Radiography

    T. Sasabe, S. Tsushima, S. Hirai

    POLYMER ELECTROLYTE FUEL CELLS 10, PTS 1 AND 2   33 ( 1 )   1413 - 1422   2010

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    DOI: 10.1149/1.3484633

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  • Erratum: Magnetic resonance imaging of water in operating polymer electrolytemembrane fuel cell (Fuel Cells (2009) 9:5 (506-517) 10.1002/fuce.200800151) Reviewed

    Shohji Tsushima, Shuichiro Hirai

    Fuel Cells   9 ( 5 )   760   2009.10

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    DOI: 10.1002/fuce.200990016

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  • Magnetic resonance imaging of a polymer electrolyte membrane under water permeation Reviewed

    S. Tsushima, S. Takita, S. Hirai, N. Kubo, K. Aotani

    Experimental Heat Transfer   22 ( 1 )   1 - 11   2009.1

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    DOI: 10.1080/08916150802530484

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  • Super-atomization of liquid CO(2) for stable geological storage

    Suguru Uemura, Shohji Tsushima, Shuichiro Hirai

    GREENHOUSE GAS CONTROL TECHNOLOGIES 9   1 ( 1 )   3087 - 3090   2009

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    DOI: 10.1016/j.egypro.2009.02.088

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  • Visualization measurement of water in anode of PEFC by water sensitive paper

    Yokoi Yoma, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2009   194 - 194   2009

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    DOI: 10.11368/nhts.2009.0.194.0

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  • Quantitative measurement of water in cathode electrode of PEFC using near-infrared absorption spectroscopy

    Ishii Motoyuki, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2009   197 - 197   2009

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    DOI: 10.11368/nhts.2009.0.197.0

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  • 4-5-4 Effects of SO_2 Concentration in Air and Humidification on PEFC Electrode Contamination

    KANEKO Keisuke, TSUSHIMA Shohji, HIRAI Shuichiro

    Proceedings of the Annual Conference of The Japan Institute of Energy   18   268 - 269   2009

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    Sulfur dioxide (SO_2) has an effect on degradation of catalyst layers and/or membrane in polymer electrolyte membrane fuel cells (PEFCs). In this study, temporal variation of cell voltage under open circuit condition was monitored with various SO_2 concentration and humidification. Cell voltage drop and its relaxation time were well correlated with SO_2 concentration. Pt utilization rate characterized by cyclic voltmmograms were also carried out to investigate poisoning behavior by SO_2. It was observed that SO_2 contamination in the anode was intensified at lower relative humidity condition.

    DOI: 10.20550/jietaikaiyoushi.18.0_268

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  • [展望講演]燃料電池とCO2貯留の研究開発にみるin situ計測がもたらす新展開

    津島 将司, 平井 秀一郎

    化学工学会 研究発表講演要旨集   2009   231 - 232   2009

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    DOI: 10.11491/scej.2009f.0.231.0

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  • Visualization of immiscible fluids in water-saturated sandstone by micro-focus X-Ray CT

    Kataoka Ryoto, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2009   262 - 262   2009

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    DOI: 10.11368/nhts.2009.0.262.0

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  • Development of a visualization technique for immiscible two-liquid flows in a complex channel utilizing the index-matching method

    Uemura Suguru, Nakamori Akira, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2009   373 - 373   2009

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    DOI: 10.11368/nhts.2009.0.373.0

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  • EXPERIMENTAL VISUALIZATION AND NUMERICAL SIMULATION OF WATER TRANSPORT IN GAS DIFFUSION LAYER OF PEFC Reviewed

    Kosuke Nishida, Motoyuki Ishii, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON POWER ENGINEERING 2009 (ICOPE-09), VOL 2   231 - 236   2009

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  • MEASUREMENT OF WATER DISTRIBUTION IN ANODE OF POLYMER ELECTROLYTE FUEL CELL UNDER LOW HUMIDITY CONDITIONS Reviewed

    Kosuke Nishida, Yohma Yokoi, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY   121 - 127   2009

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  • LIQUID WATER VISUALIZATION IN AN OPERATING PEMFC BY SOFT X-RAY RADIOGRAPHY Reviewed

    Takashi Sasabe, Shohji Tsushima, Shuichiro Hirai, Katsunori Minami, Keiji Yada

    PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY   137 - 142   2009

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  • Visualization of Liquid Water Distribution in an Operational PEMFC by Soft X-Ray Radiography

    T. Sasabe, S. Tsushima, S. Hirai, K. Minami, K. Yada

    PROTON EXCHANGE MEMBRANE FUEL CELLS 9   25 ( 1 )   513 - 521   2009

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    DOI: 10.1149/1.3210601

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  • Magnetic resonance imaging of water in operating polymer electrolyte membrane fuel cells

    Tsushima, Shohji, Hirai, Shuichiro

    Fuel Cells   9 ( 5 )   506 - 517   2009

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  • Effect of SO2 Concentration and Relative Humidity on Contamination of Cathode and Anode in PEMFC

    K. Kaneko, S. Tsushima, S. Hirai

    PROTON EXCHANGE MEMBRANE FUEL CELLS 9   25 ( 1 )   1279 - 1287   2009

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    DOI: 10.1149/1.3210683

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  • Effect of Micro Porous Layer on Membrane Hydration Path under Low Humidity Operation of PEMFC

    Y. Fujii, S. Tsushima, S. Hirai

    PROTON EXCHANGE MEMBRANE FUEL CELLS 9   25 ( 1 )   1783 - 1789   2009

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    DOI: 10.1149/1.3210734

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  • Fundamentals of Fuel Cells (Japanese Title: 燃料電池の原理と特徴)

    Tsushima, Shohji, Hirai, Shuichiro

    Journal of High Temperature Society   35   224 - 230   2009

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  • High Resolution MRI Investigation of Transversal Water Content Distributions in PEM under Fuel Cell Operation

    J. Y. Shim, S. Tsushima, S. Hirai

    PROTON EXCHANGE MEMBRANE FUEL CELLS 9   25 ( 1 )   523 - 528   2009

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    DOI: 10.1149/1.3210602

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  • Experimental and Modeling Studies on the Effect of Oxygen Partial Pressure on Membrane Degradation in PEMFCs

    Jae Young Shim, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   156 ( 6 )   B690 - B694   2009

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    DOI: 10.1149/1.3110985

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  • Visualization Measurement of Water in Anode of PEFC under Low Humidity Operation using Water Sensitive Paper (Japanese Title: 感水試験紙を用いた低加湿運転 PEFC のアノード側水分状態の可視化計測)

    Nishida, Kosuke, Yokoi, Yoma, Tsushima, Shohji, Hirai, Shuichiro

    Journal of High Temperature Society   35   269 - 275   2009

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  • Application of MRI in the Measurement of Two-Phase Flow of Supercritical CO2 and Water in Porous Rocks

    Tetsuya Suekane, Naoto Furukawa, Shoji Tsushima, Shuichiro Hirai, Masanori Kiyota

    JOURNAL OF POROUS MEDIA   12 ( 2 )   143 - 154   2009

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  • Magnetic Resonance Imaging and Tunable Diode Laser Absorption Spectroscopy for In-Situ Water Diagnostics in Polymer Electrolyte Membrane Fuel Cells

    Tsushima, Shohji, Hirai, Shuichiro

    Modeling and Diagnostics of Polymer Electrolyte Fuel Cells   201 - 224   2009

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  • Visualization Measurement of Water in Anode of PEFC under Low Humidity Operation using Water Sensitive Paper

    NISHIDA Kosuke, YOKOI Yoma, TSUSHIMA Shohji, HIRAI Shuichiro

    Journal of High Temperature Society   35 ( 5 )   269 - 275   2009

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    During low humidity operation of polymer electrolyte fuel cells (PEFCs), water management is a critical issue to enhancement of cell performance because low proton conductivity of electrolyte membrane is caused by membrane dehydration. In an operating PEFC at high current densities, water migrates significantly through the membrane from the anode to cathode owing to electro-osmotic drag, and the membrane dehydration occurs mainly at the anode. In order to alleviate this problem known as "dryout", it is essential to understand the fundamental phenomena of the water transport within the fuel cell. In this study, the water distribution in the anode flow field of a PEFC with low humidity conditions was experimentally visualized by using water sensitive paper (WSP). Furthermore, the dew-point temperature at the anode outlet and the membrane resistance were simultaneously measured, and the effects of inlet gas humidification and current density on the water transport in the anode and the cell performance were discussed. It was found that the water vapor concentration in the anode increases gradually after the startup because of the back diffusion of the product water. Especially at high current densities, the humidification of the anode inlet gas is effective to achieve the proper water management on the anode side and decrease the membrane resistance.

    DOI: 10.7791/jhts.35.269

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  • Surface Structure Analysis of Polymer Electrolyte Membrane under Water Permeation Process by Tapping-Mode Atomic Force Microscopy

    S. Tsushima, A. Tsubota, Y. Tabuchi, S. Hirai

    PROTON EXCHANGE MEMBRANE FUEL CELLS 9   25 ( 1 )   1433 - 1438   2009

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    DOI: 10.1149/1.3210699

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  • 電子移動の化学電子移動の化学, 1996

    津島将司, 平井秀一郎

    高温学会誌   35 ( 5 )   224 - 230   2009

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  • Geological storage of carbon dioxide by residual gas and solubility trapping

    Tetsuya Suekane, Tomohisa Nobuso, Shuichiro Hirai, Masanori Kiyota

    INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL   2 ( 1 )   58 - 64   2008.1

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    DOI: 10.1016/S1750-5836(07)00096-5

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  • Effect of the Micro Porous Layer on Water Transport under Low Humidity Condition

    Y. Fujii, S. Tsushima, K. Fukuzato, S. Hirai

    PROTON EXCHANGE MEMBRANE FUEL CELLS 8, PTS 1 AND 2   16 ( 2 )   1635 - +   2008

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    DOI: 10.1149/1.2982003

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  • Visualization and quantitative measurement of liquid water in a cathode gas diffusion layer of PEFC

    Ito Hirokazu, Murakami Takeshi, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Proceedings of National Heat Transfer Symposium   2008   246 - 246   2008

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    DOI: 10.11368/nhts.2008.0.246.0

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  • 4-24 Investigation of impurity behaviors by in-line exhausted gas analysis in PEFC

    HIRAI Shuichiro, MORIOKA Hiroyuki, TSUSHIMA Shohji

    Proceedings of the Annual Conference of The Japan Institute of Energy   17   242 - 243   2008

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    DOI: 10.20550/jietaikaiyoushi.17.0_242

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  • 2120 Performance distribution caused by water transport in PEMFC under low humidity condition

    FUJII Yoshinobu, TSUSHIMA Shohji, HIRAI Shuichiro

    The proceedings of the JSME annual meeting   2008   23 - 24   2008

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    For implementation of higher performance of Polymer Electrolyte Membrane Fuel Cells (PEMFCs) under low humidity condition, water management is essential to keep membrane hydration. To establish water management, it is strongly necessary to understand the water transport in PEMFCs. In this study, the effect of the micro porous layer (MPL) and counter-flow mode under low humidity condition on water transport was examined. Tunable Diode Laser Absorption Spectroscopy (TDLAS) measurement system, which can measure water vapor concentration in the PEMFCs channels, was used in order to investigate water transport between the cathode and the anode side. The experimental results showed that the MPL enhances transport of generated water from the cathode side catalyst layer to the anode side channel through the membrane, and it results in improvement of membrane hydration. The results also showed that improvement of performance at the gas inlet region is caused by counter-flow mode.

    DOI: 10.1299/jsmemecjo.2008.7.0_23

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  • Study on the ultramicronization of liquid CO2 for stable geological storage

    UEMURA Suguru, SUZUKI Keisuke, TSUSHIMA Shohji, HIRAI Shuichiro

    Proceedings of National Heat Transfer Symposium   2008   60 - 60   2008

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    DOI: 10.11368/nhts.2008.0.60.0

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  • PEFC膜電極複合体内の極細熱電対による温度計測

    笹部 崇, 津島 将司, 平井 秀一郎

    化学工学会 研究発表講演要旨集   2008   274 - 274   2008

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    DOI: 10.11491/scej.2008f.0.274.0

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  • 2117 Effects of Partial Pressure Dependency Gas Crossover on the PEMFC Membrane Degradation

    SHIM Jae Young, TSUSHIMA Shohji, HIRAI Shuichiro

    The proceedings of the JSME annual meeting   2008   17 - 18   2008

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    In this study, the accelerated membrane degradation experiments for polymer electrolyte membrane fuel cells (PEMFCs) under OCV condition were conducted to investigate the membrane degradation behaviors under different supplying gas condition such as hydrogen/oxygen and hydrogen/air. Through the cross-sectional SEM images of the postmortem MEA, it is elucidated that the anode side of the membrane is more deteriorated under H_2 and O_2 condition. In contrast, it is affirmed that the cathode side of the membrane is more deteriorated under hydrogen and air condition. This phenomenon is caused by the discrepancy of oxygen crossover between oxygen and air due to the partial pressure difference. To investigate the crossover effect on the membrane degradation, it is performed to detect the O_2 crossover in the MEA using Direct Gas Mass Spectroscopy. Numerical approach of the membrane degradation rate is performed with the experimental results. The calculated results were well matched to the experimental results.

    DOI: 10.1299/jsmemecjo.2008.7.0_17

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  • Effect of Relative Humidity on Contamination of Cathode and Anode Electrodes by Sulfur Dioxide in Air Stream in PEMFC

    S. Tsushima, H. Morioka, K. Kaneko, S. Hirai

    PROTON EXCHANGE MEMBRANE FUEL CELLS 8, PTS 1 AND 2   16 ( 2 )   1043 - 1050   2008

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    DOI: 10.1149/1.2981945

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  • Water Transport and Degradation Analysis in PEMFC by in-situ MRI Visualization

    Hirai, Shuichiro, Tsushima, Shohji

    ECS Transactions   16 ( 2 )   1337 - 1343   2008

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  • MRI investigation of the water transport mechanism in a membrane under elevated temperature with variation of relative humidity and current density

    T. Ikeda, T. Koido, S. Tsushima, S. Hirai

    ECS Transactions   16 ( 2 )   1035 - 1040   2008

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    DOI: 10.1149/1.2981944

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  • Imaging of Water in Polymer Electrolyte Membrane in Fuel Cells

    Tsushima, Shohji, Hirai, Shuichiro

    Magnetic Resonance Microscopy   2008

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  • Investigation of Current Density Effect on Water Vapor Concentration Profile along PEMFC Channels by TDLAS

    Yoshinobu Fujii, Shohji Tsushima, Shuichiro Hirai

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   3 ( 1 )   94 - 102   2008

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    DOI: 10.1299/jtst.3.94

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  • Characterization and Modeling of Gas Crossover and its Impact on the Membrane Degradation of PEMFCs

    J. Y. Shim, S. Tsushima, S. Hirai

    PROTON EXCHANGE MEMBRANE FUEL CELLS 8, PTS 1 AND 2   16 ( 2 )   1705 - 1712   2008

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    DOI: 10.1149/1.2982011

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  • Evaluation of CO(2) dilution in ocean sequestration Reviewed

    S. Hirai, S. Tsushima

    OCEANS 2008 - MTS/IEEE KOBE TECHNO-OCEAN, VOLS 1-3   653 - 655   2008

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  • Lattice Boltzmann simulation on flow fields connected with multiple side-channels Reviewed

    Shohji Tsushima, Koji Moriyama, Shuichiro Hirai

    Heat Transfer - Asian Research   36 ( 2 )   96 - 104   2007.3

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    DOI: 10.1002/htj.20143

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  • Visualization of microscopic behavior and promotion of water removal in a porous electrode of polymer electrolyte fuel cell

    Kosuke Nishida, Shohji Tsushima, Kazuhiro Teranishi, Shuichiro Hirai

    KAGAKU KOGAKU RONBUNSHU   33 ( 2 )   181 - 185   2007.3

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  • Microscopic visualization of state and behavior of liquid water in a gas diffusion layer of PEFC

    Kosuke Nishida, Takeshi Murakami, Shohji Tsushima, Shuichiro Hirai

    ELECTROCHEMISTRY   75 ( 2 )   149 - 151   2007.2

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  • 固体高分子形燃料電池における多孔質電極内水分のミクロ挙動可視化計測と排出促進

    西田耕介, 津島将司, 寺西一浩, 平井秀一郎

    化学工学論文集   33 ( 2 )   181 - 185   2007

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  • Optical remote sensing of oxygen and water vapor concentration in PEMFC channel by using tunable diode laser absorption spectroscopy techniques Reviewed

    Yoshinobu Fujii, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME/JSME THERMAL ENGINEERING SUMMER HEAT TRANSFER CONFERENCE 2007, VOL 2   71 - 75   2007

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  • Visualization of water transport and freezing process in a gas diffusion layer of PEFC during low temperature operation Reviewed

    Kosuke Nishida, Takeshi Murakami, Kazutaka Kobayashi, Shohji Tsushima, Shuichiro Hirai

    PROCEEDINGS OF THE ASME/JSME THERMAL ENGINEERING SUMMER HEAT TRANSFER CONFERENCE 2007, VOL 2   25 - 31   2007

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  • 0541 Study on the flow in sandstones for CO_2 geological storage by means of MRI

    Furukawa Naoto, Suekane Tetsuya, Tsushima Shohji, hirai Shuichiro

    The proceedings of the JSME annual meeting   2007   111 - 112   2007

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    This paper describes experimental research on application of magnetic resonance imaging(MRI) to the measurement of two-phase flow of supercritical carbon dioxide (CO_2) and water in a Berea sandstone which is the phenomena encountered in CO_2 geological storage. In-situ water saturation distributions in a Berea sandstone core were successfully visualized at conditions that simulate those at 700-1000-m depths in an aquifer. By applying a coreflood interpretation method to our measured data, we evaluate the effect of viscosity, capillary pressure, and buoyancy on two-phase flow in sandstone.

    DOI: 10.1299/jsmemecjo.2007.3.0_111

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  • MRI application for clarifying fuel cell performance with variation of polymer electrolyte membranes: Comparison of water content of a hydrocarbon membrane and a perfluorinated membrane Reviewed

    S. Tsushima, S. Hirai, K. Kitamura, M. Yamashita, S. Takase

    Applied Magnetic Resonance   32 ( 1-2 )   233 - 241   2007

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    DOI: 10.1007/s00723-007-0009-0

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  • Preferential thinning behaviors of the anode-side of the PEM under durability test

    Jae Young Shim, Shohji Tsushima, Shuichiro Hirai

    ECS Transactions   11 ( 1 )   1151 - 1156   2007

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    DOI: 10.1149/1.2781027

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  • Visualization of membrane hydration path in an operating PEMFC by nuclei-labeling MRI

    T. Kotaka, S. Tsushima, S. Hirai

    ECS Transactions   11 ( 1 )   445 - 450   2007

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    DOI: 10.1149/1.2780958

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  • Investigation of hydrogen cross-leak behaviors in a polymer electrolyte membrane by direct gas mass spectroscopy and magnetic resonance imaging

    Shohji Tsushima, Takanori Nanjo, Shuichiro Hirai

    ECS Transactions   11 ( 1 )   434 - 443   2007

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    DOI: 10.1149/1.2780957

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  • 4-17 Elucidation of Hydrogen Cross Leak Mechanism in PEFCs by In-situ Water Measurement and Cathode Gas Emission Analysis

    TSUSHIMA Shoji, NANJO Takanori, FUJII Yoshinobu, HIRAI Shuichiro

    Proceedings of the Annual Conference of The Japan Institute of Energy   16   280 - 281   2007

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    DOI: 10.20550/jietaikaiyoushi.16.0_280

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  • CO_2 の地中と海洋への隔離

    平井秀一郎, 津島将司, 末包哲也

    伝熱: journal of the Heat Transfer Society of Japan   46 ( 197 )   19 - 24   2007

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  • PEFC 水分診断技術としての MRI モニタリング (特集 PEFC の耐久性向上と関連技術)

    津島将司, 平井秀一郎

    燃料電池   6 ( 3 )   77 - 82   2007

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  • In-situ measurement of water vapor and oxygen concentration in a PEMFC channel by tunable diode laser absorption spectroscopy techniques

    Y. Fujii, S. Tsushima, S. Hirai

    ECS Transactions   11 ( 1 )   451 - 459   2007

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    DOI: 10.1149/1.2780959

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  • Degradation mechanism of PEMFC under open circuit operation

    Kazuhiro Teranishi, Kentaro Kawata, Shohji Tsushima, Shuichiro Hirai

    ELECTROCHEMICAL AND SOLID STATE LETTERS   9 ( 10 )   A475 - A477   2006

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    DOI: 10.1149/1.2266163

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  • チャネル構造を有する多孔質体における流動特性と表面セラミックス膜の影響

    津島将司, 藤岡靖昌, 平井秀一郎, 山本昌弘, 中筋善淳

    日本機械学会論文集 B 編   72 ( 717 )   1271 - 1277   2006

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  • Non-Contact Measurement of H_2O Concentration in a Fuel Cell Channel by Tunable Diode Laser Absorption Spectroscopy

    NISHIDA Kosuke, TSUSHIMA Shohji, TERANISHI Kazuhiro, HIRAI Shuichiro, FUKUZATO Katsuhiko

    Transactions of the Japan Society of Mechanical Engineers B   72 ( 718 )   1627 - 1632   2006

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    Polymer electrolyte fuel cell (PEFC) is a promising candidate for mobile and vehicle applications and distributed power systems due to its high power density and low operation temperature. However, water management in a cathode gas channel is essential for high performance operation of PEFC because oxygen needs to be sufficiently supplied to reaction sites. In this study, we have developed the non-contact measurement technique of water vapor concentration in a gas channel of PEFC using tunable diode laser absorption spectroscopy (TDLAS). Transient profiles of water vapor concentration in an operating PEFC are accurately estimated by this technique and the effects of operating conditions and channel structure on H_2O concentration in a fuel cell channel are clarified.

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    Other Link: http://hdl.handle.net/10212/1607

  • Imaging of Migration and Dissolution of CO 2 in Rock by Nuclear Magnetic Resonance

    末包哲也, 古川直人, 水本飛鳥, 津島将司, 平井秀一郎

    可視化情報学会誌   26 ( 1 )   295 - 298   2006

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  • Analysis of water transport in PEFCs by magnetic resonance imaging measurement

    K Teranishi, S Tsushima, S Hirai

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   153 ( 4 )   A664 - A668   2006

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    DOI: 10.1149/1.2167954

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  • Migration of CO2 in Porous Media Filled with water.

    Tetsuya Suekane, Toshihiro Ishii, Shoji Tsushima, Shuichiro Hirai

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   1 ( 1 )   1 - 11   2006

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    DOI: 10.1299/jtst.1.1

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  • 側壁を複数チャネルにより連結された流動場における格子ボルツマン解析

    津島将司, 盛山浩司, 平井秀一郎

    日本機械学会論文集 B 編   72 ( 718 )   1613 - 1618   2006

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  • z Shohji Tsushima,* and Shuichiro Hirai

    Teranishi, Kazuhiro

    Journal of The Electrochemical Society   153   2006

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  • Degradation investigation of PEMFC by scanning electron microscopy and direct gas mass spectroscopy

    Y. Fujii, S. Tsushima, K. Teranishi, K. Kawata, T. Nanjo, S. Hirai

    ECS Transactions   3 ( 1 )   735 - 741   2006

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    DOI: 10.1149/1.2356193

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  • Flow Characteristic of a Porous System Employing Multi-hole Channels With or Without Surface Ceramics Layer

    Tsushima, Shohji, Fujioka, Yasumasa, Hirai, Shuichiro, Yamamoto, Yoshihiro, Nakasuji, Yoshizumi

    Nippon Kikai Gakkai Ronbunshu B Hen(Transactions of the Japan Society of Mechanical Engineers Part B)(Japan)   18 ( 5 )   1271 - 1277   2006

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  • Non-Contact Measurement of H 2 O Concentration in a Fuel Cell Channel by Tunable Diode Laser Absorption Spectroscopy

    Nishida, Kosuke, Tsushima, Shohji, Teranishi, Kazuhiro, Hirai, Shuichiro, Fukuzato, Katsuhiko

    Nippon Kikai Gakkai Ronbunshu B Hen(Transactions of the Japan Society of Mechanical Engineers Part B)(Japan)   18 ( 6 )   1627 - 1632   2006

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  • Experimental elucidation of proton conducting mechanism in a polymer electrolyte membrane of fuel cell by nuclei labeling MRI

    S. Tsushima, K. Teranishi, S. Hirai

    ECS Transactions   3 ( 1 )   91 - 96   2006

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    DOI: 10.1149/1.2356127

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  • MRI電解質膜水分の高空間分解能計測

    川田 健太郎, 津島 将司, 吉田 瑞穂, 藤井 義喜, 平井 秀一郎

    化学工学会 研究発表講演要旨集   2006   672 - 672   2006

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    DOI: 10.11491/scej.2006f.0.672.0

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  • Lattice Boltzmann Simulation on Flow Fields

    Tsushima, Shohji, Moriyama, Koji, Hirai, Shuichiro

    Nippon Kikai Gakkai Ronbunshu B Hen(Transactions of the Japan Society of Mechanical Engineers Part B)(Japan)   18 ( 6 )   1613 - 1618   2006

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  • Investigation of the lateral water distribution in a proton exchange membrane in fuel cell operation by 3D-MRI

    S. Tsushima, T. Nanjo, K. Nishida, S. Hirai

    ECS Transactions   1 ( 6 )   199 - 205   2006

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    DOI: 10.1149/1.2214490

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  • PEFC拡散層内二相流動のLBM数値シミュレーション

    伊藤 等, 平井 秀一郎, 津島 将司, 末包 哲也

    化学工学会 研究発表講演要旨集   2006   632 - 632   2006

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    DOI: 10.11491/scej.2006f.0.632.0

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  • Investigation of the lateral water distribution in a proton exchange membrane in fuel cell operation by 3D-MRI

    Tsushima, Shohji, Nanjo, Takanori, Nishida, Kousuke, Hirai, Shuichiro

    ECS Transactions   1 ( 6 )   199 - 205   2006

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  • Behavior of supercritical CO2 injected into porous media containing water

    T Suekane, S Soukawa, S Iwatani, S Tsushima, S Hirai

    ENERGY   30 ( 11-12 )   2370 - 2382   2005.8

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    DOI: 10.1016/j.energy.2003.10.026

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  • International symposium on CO2 fixation and efficient utilization of energy (C&E 2002) and the International World Energy System Conference (WESC-2002) Tokyo,Japan 4-6 March 2002 - Editorial introduction

    Y Kaizu, Y Tamaura, S Hirai

    ENERGY   30 ( 11-12 )   2023 - 2024   2005.8

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  • Injection and boiling of liquid CO2 with a hydrate coating

    S Hirai, H Sanda

    ENERGY   30 ( 11-12 )   2275 - 2283   2005.8

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    DOI: 10.1016/j.energy.2003.10.020

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  • Water diffusion measurement in fuel-cell SPE membrane by NMR Reviewed

    S Tsushima, K Teranishi, S Hirai

    ENERGY   30 ( 2-4 )   235 - 245   2005.2

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    DOI: 10.1016/j.energy.2004.04.013

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  • Water content distribution in a polymer electrolyte membrane for advanced fuel cell system with liquid water supply Reviewed

    S Tsushima, K Teranishi, K Nishida, S Hirai

    MAGNETIC RESONANCE IMAGING   23 ( 2 )   255 - 258   2005.2

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    DOI: 10.1016/j.mri.2004.11.059

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  • Characteristics of an immiscible flow of supercritical CO2 and water in porous media under sequestration conditions Reviewed

    Tetsuya Suekane, Toshihiro Ishii, Shohji Tsushima, Shuichiro Hirai

    Greenhouse Gas Control Technologies   1231 - 1236   2005

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    DOI: 10.1016/B978-008044704-9/50132-4

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  • Study of the effect of membrane thickness on the performance of polymer electrolyte fuel cells by water distribution in a membrane

    K Teranishi, S Tsushima, S Hirai

    ELECTROCHEMICAL AND SOLID STATE LETTERS   8 ( 6 )   A281 - A284   2005

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  • Study on the Proton Transport Phenomenon in a Polymer Electrolyte Membrane by the MRI Measurement of the^ 1H/^ 2D Replace during Operation Mode

    TERANISHI, Kazuhiro, TSUSHIMA, Shohji, NISHIDA, Kosuke, HIRAI, Shuichiro

    Thermal science and engineering   13 ( 4 )   55 - 56   2005

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  • Numerical Analysis of Two-Phase Flow in Porous Media by LBM

    SUEKANE, Tetsuya, TSUKAMOTO, Yoshihisa, HIRAI, Shuichiro

    Theoretical and Applied Mechanics Japan   54   235 - 242   2005

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  • Study on two-phase flows in porous rocks in CO2 geological storage

    MIZUMOTO Asuka, SUEKANE Tetsuya, TSUSHIMA Shoji, HIRAI Shuichiro

    Transactions of Visualization Society of Japan   25 ( Supplement2 )   259 - 260   2005

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    Though CO2 leakage from a geological storage site through wells and rifts represents a major concern, it is difficult to monitor the CO2 leakage. In this paper we have experimentally investigated the proton relaxation time (T1) of carbonate-water filled in a porous media at high pressure with an NMR system to see the dependence of T1 on the concentration of CO2. From the results, it has been observed that the higher the CO2 concentration is, the shorter the T1 of the carbonate-water in the porous media becomes. Therefore this information is very useful to apply NMR logging to monitor the CO2 leakage.

    DOI: 10.3154/jvs.25.Supplement2_259

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  • Advanced CO2 dilution technology in intermediate depth of ocean Reviewed

    Shuichiro Hirai, Shohji Tsushima, Ryoichi Muraoka, Hisashi Sanda, Masahiko Ozaki

    Greenhouse Gas Control Technologies   1505 - 1510   2005

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    DOI: 10.1016/B978-008044704-9/50172-5

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  • Elucidation of Pressurization Effect on PEFC Performance Using Electrochemical Impedance Spectroscopy and Magnetic Resonance Imaging

    TSUSHIMA Shohji, MIBAE Tatsuro, TERANISHI Kazuhiro, HIRAI Shuichiro

    Thermal Science and Engineering   13 ( 1 )   31 - 36   2005

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  • 3626 Two-Phase Flow for CO_2 Geological Sequestration Based on in-situ Data by MRI.

    SUEKANE Tetsuya, ISHII Toshihiro, TSUSHIMA Shoji, HIRAI Shuichiro

    The proceedings of the JSME annual meeting   2005   289 - 290   2005

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    This paper describes experimental research on two-phase flow of supercritical CO_2 and water in a Berea sandstone core. We used a magnetic resonance imaging (MRI) technique to directly visualize the distribution of supercritical CO_2 injected into the sandstone core containing water. In-situ saturation distributions were successfully visualized under the temperature and pressure conditions corresponding to the aquifers at the depth of about 900m with a projection method every 10 seconds. A new coreflood interpretation method proposed by Good field et al. was applied to in-situ saturation data to evaluate two-phase flows in sandstone directly. We have experimentally demonstrated that capillary dispersion rate could be evaluated as a function of water saturation independent of viscosity and buoyancy.

    DOI: 10.1299/jsmemecjo.2005.3.0_289

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  • Growth-controlling processes of CO2 gas hydrates Reviewed

    S Hirai, H Sanda

    AMERICAN MINERALOGIST   89 ( 8-9 )   1260 - 1263   2004.8

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  • Improvement of Performance and Water Distribution in Membrane on Polymer Electrolyte Fuel Cell by High Pressure Operation

    MIBAE, Tatsuro, TSUSHIMA, Shohji, HIRAI, Shuichiro

    Thermal science and engineering   12 ( 4 )   89 - 90   2004

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  • PIV Measurement on a Wake Flow behind a Cylinder over Critical Reynolds Number

    TSUSHIMA, Shohji, MURAOKA, Ryoichi, HIRAI, Shuichiro

    Thermal science and engineering   12 ( 4 )   137 - 138   2004

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  • Improvement of PEFC Performance by Membrane Hydration with Liquid Water Supply

    TSUSHIMA Shohji, TERANISHI Kazuhiro, HIRAI Shuichiro

    The proceedings of the JSME annual meeting   2004   307 - 308   2004

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    In this article, we examined an effect of liquid water supply to a polymer electrolyte fuel cell membrane on membrane hydration and cell performance, because the membrane is to be swelled by means of direct contact with liquid water and thus improvement of cell performance can be expected. We assembled a fuel cell with liquid water feed for magnetic resonance imaging (MRI) measurement and measured water content distribution in the membrane under fuel cell operation with liquid water supply. It was revealed that supplying liquid water to the membrane improved cell performance. MRI result clearly shows that liquid water supply enhanced membrane hydration, resulting in reduction of electric resistance of the membrane.

    DOI: 10.1299/jsmemecjo.2004.3.0_307

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  • Magnetic resonance imaging of the water distribution within a polymer electrolyte membrane in fuel cells

    S Tsushima, K Teranishi, S Hirai

    ELECTROCHEMICAL AND SOLID STATE LETTERS   7 ( 9 )   A269 - A272   2004

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    DOI: 10.1149/1.1774971

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  • Performance of polymer electrolyte membrane fuel cell with pressurization up to 4.0MPA

    Shohji Tsushima, Tatsuro Mibae, Kazuhiro Teranishi, Shuichiro Hirai

    Proceedings - Electrochemical Society   PV 2004-21   694 - 700   2004

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  • Water transport analysis in a polymer electrolyte fuel cell membrane with constrain and humidiflcation effect

    TERANISHI Kazuhiro, TSUSHIMA Shohji, FUKUZATO Katsuhiko, HIRAI Shuichiro

    The proceedings of the JSME annual meeting   2004   305 - 306   2004

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    A water transport analysis has been developed and used to investigate the water distribution in the polymer electrolyte membrane for the polymer electrolyte fuel cell. In this article, we introduce the maximum water content value for the PEM, and water transport constant for the cell, based on the experiment respectively. The analyzed water distribution of a PEM at various operation conditions is consistent with that of the previous MRI measurement.

    DOI: 10.1299/jsmemecjo.2004.3.0_305

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  • 可視化情報学会誌= Journal of the Visualization Society of Japan 31 (123), 149-154, 2011-10-01

    犬飼潤治, 渡辺政廣, 富安城司, 稲室隆二, 西田耕介, 津島将司, 寺西一浩, 平井秀一郎, 高田健司, 石上雄太

    J. Electrochemical Society   151   A399 - A406   2004

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  • Study on mass transfer in a polymer electrolyte fuel cell by using magnetic resonance imaging

    TERANISHI, Kazuhiro, TSUSHIMA, Shohji, HIRAI, Shuichiro

    Thermal science and engineering   12 ( 4 )   91 - 92   2004

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  • Velocity measurement of clay intrusion through a sudden contraction step using a tagging pulse sequence

    S Tsushima, A Hasegawa, T Suekane, S Hirai, Y Tanaka, Y Nakasuji

    MAGNETIC RESONANCE IMAGING   21 ( 6 )   673 - 677   2003.7

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    DOI: 10.1016/S0730-725X(03)00095-X

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  • Heat transfer and flown of HeII in narrow channels Reviewed

    T Suekane, M Sekiguchi, S Hirai, T Okamura

    CRYOGENICS   43 ( 2 )   125 - 131   2003.2

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    DOI: 10.1016/S0011-2275(03)00050-X

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  • Inertial flow structures in a simple-packed bed of spheres

    T Suekane, Y Yokouchi, S Hirai

    AICHE JOURNAL   49 ( 1 )   10 - 17   2003.1

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  • 4-5. Cell Performance and Water Content in a Polymer Electrolyte Fuel Cell with Variation of Membrane Thickness

    TSUSHIMA Shohji, TERANISHI Kazuhiro, HIRAI Shuichiro

    Proceedings of the Annual Conference of The Japan Institute of Energy   12   264 - 265   2003

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    DOI: 10.20550/jietaikaiyoushi.12.0_264

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  • Membrane Thickness Effect on PEFC's Performance by Measurement of Water Distribution

    Teranishi, Kazuhiro, Tsushima, Shoji, Hirai, Shuichiro

    Thermal science and engineering   11 ( 5 )   35 - 36   2003

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  • Experimental studies on liquid CO2 injection with hydrate film and highly turbulent flows behind the releasing pipe Reviewed

    S Tsushima, S Hirai, H Sanda, S Terada

    GREENHOUSE GAS CONTROL TECHNOLOGIES, VOLS I AND II, PROCEEDINGS   837 - 842   2003

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  • Direct Supply of Water into a Polymer Electrolyte Membrane for Improvement of Cell Performance

    TSUSHIMA, Shohji, TERANISHI, Kazuhiro, HIRAI, Shuichiro

    Thermal science and engineering   11 ( 4 )   31 - 32   2003

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  • 7-17. Conversion of Methane to Hydrogen with Carbon Fixation

    HIRAI Shuichiro, KATO Ichiro, TAKAHASHI Daishi, TSUSHIMA Shouji, SUEKANE Tetsuya

    Proceedings of the Annual Conference of The Japan Institute of Energy   12   348 - 349   2003

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    DOI: 10.20550/jietaikaiyoushi.12.0_348

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  • Dilution of CO_2 at intermediate depth of ocean

    Hirai Shuichiro, Tsushima Shoji, Sanda Hisashi, Muraoka Ryoichi

    The proceedings of the JSME annual meeting   2003   317 - 318   2003

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    CO_2 sequestration in ocean, i.e. transportation of liquefied CO_2 removed from flue gas at fossil-fuel-fired power plants through a pipe into the ocean, is considered to be an effective mitigation strategy for global warning due to the increase of CO_2 in the atmosphere. One of the methods considered for implementation is dissolution of CO_2 at intermediate ocean depth using moving ship, where released liquid CO_2 droplets dissolve in the process of rising upward due to buoyancy in the sea water. CO_2 dissolved sea water would be diluted due to the seawater entrainment induced by the turbulent wake of towed pipe for releasing CO_2. Key point of the strategy is how long would it take for CO_2 concentration to be negligibly small. We describe here numerical studies on the evaluation of the dilution of CO_2 at the wake region of moving towed pipe. A numerical simulation employing four equations turbulence model was conducted to elucidate the pH variations in terms of both time and space. CO_2 dilution is fast enough compared to the data of biological impact.

    DOI: 10.1299/jsmemecjo.2003.3.0_317

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  • 入門材料電磁プロセッシング入門材料電磁プロセッシング, 2000

    佐崎元, 佐藤孝雄, 松浦良樹, 中嶋一雄, 大塚秀幸, 安田秀幸, 谷口尚司, 末包哲也, 小路宏幸, 平井秀一郎

    日本機械学會論文集. B 編   68 ( 668 )   1052 - 1057   2002

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  • 磁気共鳴イメージングによる気体の計測: 第 1 報, 高圧下における計測と分子拡散が及ぼす影響 (熱工学, 内燃機関, 動力など)

    津島将司, 平井秀一郎, 入口紀男, 岡本征雄, 末包哲也

    日本機械学会論文集 B 編   68 ( 666 )   556 - 561   2002

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  • Numerical simulation on the removal of contaminants in conductive fluid by electromagnetophoresis Reviewed

    Tetsuya Suekane, Hiroyuki Shoji, Shuichiro Hirai

    Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   68 ( 668 )   1052 - 1057   2002

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    DOI: 10.1299/kikaib.68.1052

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  • Study on magnetic resonance imaging of gaseous medium (1st report, imaging of pressurized gas and influence of molecular diffusion on imaging) Reviewed

    Shohji Tsushima, Shuichiro Hirai, Norio Iriguchi, Ikuo Okamoto, Tetsuya Suekane

    Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   68 ( 666 )   556 - 561   2002

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    DOI: 10.1299/kikaib.68.556

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  • Two Phase Flow of Supercritical CO_2 and Water in Porous Media

    SUEKANE Tetsuya, SOKAWA Shingo, IWATANI Satoshi, TSUSHIMA Shoji, HIRAI Shuichiro

    Proceedings of thermal engineering conference   2002   85 - 86   2002

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    Distribution of supercritical CO_2 injected into a packed bed of glass beads containing water is visualized directly by utilizing an MRI technique. After the CO_2 displaced much of the water, some water remained near the central axis, although there were several mm-sized, CO_2-rich channels running through this water-rich region. To better understand the results, we also used the lattice Boltzmann method (LBM), to numerically simulate this system. In a parallel channel with hydrophilic surfaces, a high velocity of water between the bubbles along the flow direction results in a high relative permeability at low water saturations. The effect of capillary contraction along the flow direction was also simulated. The flow through a narrow channel consisted of water and periodic passages of a CO_2 bubble. Channels with smaller cross-sectional areas have faster flow speeds, especially for a CO_2 bubble.

    DOI: 10.1299/jsmeptec.2002.0_85

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  • 不透明物体内高圧ガス流動の非破壊・非侵襲 MRI 計測

    津島将司, 平井秀一郎, 高尾洋, 山本昌弘, 中筋善淳

    圧力技術   40 ( 1 )   2002

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  • 材料電磁プロセッシング材料電磁プロセッシング, 1999

    末包哲也, 小路宏幸, 平井秀一郎

    日本機械学會論文集. B 編   68 ( 668 )   1052 - 1057   2002

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  • Thermal structure of atmospheric pressure non-equilibrium plasmas

    Nozaki, Tomohiro, Unno, Yasuko, Okazaki, Ken

    Plasma Sources Science and Technology   11 ( 4 )   2002

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  • Measurement of water distribution in polymer electrolyte fuel cell membrane by MRI

    TERANISHI, Kazuhiro, TSUSHIMA, Shohji, HIRAI, Shuichiro

    Thermal science and engineering   10 ( 4 )   59 - 60   2002

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  • 電磁泳動による導電性流体からの不純物分離の数値シミュレーション (流体工学, 流体機械)

    末包哲也, 小路宏幸, 平井秀一郎

    日本機械学会論文集 B 編   68 ( 668 )   1052 - 1057   2002

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  • MRI velocity measurements of water flow in porous media containing a stagnant immiscible liquid

    Okamoto, I, S Hirai, K Ogawa

    MEASUREMENT SCIENCE AND TECHNOLOGY   12 ( 9 )   1465 - 1472   2001.9

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  • Three-dimensional velocity measurement of complex interstitial flows through water-saturated porous media by the tagging method in the MRI technique

    K Ogawa, T Matsuka, S Hirai, K Okazaki

    MEASUREMENT SCIENCE AND TECHNOLOGY   12 ( 2 )   172 - 180   2001.2

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  • 格子ボルツマン法による二次元多孔質内流動特性の解析: 流体工学, 流体機械

    岡本征雄, 平井秀一郎

    日本機械学会論文集 B 編   67 ( 660 )   1930 - 1936   2001

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  • Experimental observations of effects of convection on flame shape and extinction on n-Heptane single droplets Reviewed

    T. Suekane, K. Yasutomi, S. Hirai

    Combustion and Flame   126 ( 1-2 )   1599 - 1601   2001

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    DOI: 10.1016/S0010-2180(01)00255-3

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  • Formation of liquid CO2 droplets and jets with deformation and growth of hydrate film Reviewed

    S Hirai, R Takamatsu, Y Tabe, K Suzuki, K Okazaki

    GREENHOUSE GAS CONTROL TECHNOLOGIES   481 - 486   2001

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  • B104 MRI Measurement of Effect of Re Number on Flow in a Simple Packed Bed of Sphere.

    SUEKANE Tetsuya, YOKOUCHI Yasuo, HIRAI Shuichiro

    Proceedings of thermal engineering conference   2001   63 - 64   2001

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    Effect of Reynolds number on the flow characteristics in a simply packed bed of spheres is measured by using an MRI technique. The flow in the packed bed tends to penetrate through the center of void space without the velocity change along the stream with the increase in the Reynolds number. Three-dimensional circulation is observed in the tail area between the spheres.

    DOI: 10.1299/jsmeptec.2001.0_63

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  • Analysis of flow characteristics in two-dimensional porous media using lattice boltzmann simulation Reviewed

    Ikuo Okamoto, Shuichiro Hirai

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   67 ( 660 )   1930 - 1936   2001

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    DOI: 10.1299/kikaib.67.1930

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  • 第 13 回数値流体力学シンポジウム講演要旨集第 13 回数値流体力学シンポジウム講演要旨集 200, 1999

    岡本征雄, 平井秀一郎

    日本機械学会論文集. B 編   67 ( 660 )   1930 - 1936   2001

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  • MRI Measurement of Local Heat Flux Distributions in Packed Bed of Ice Thermal Storage Capsules

    Ogawa Kuniyasu, Beck Mitsuhiro, Hasegawa Hiromi, Hashimoto Katsumi, Hirai Shuichiro

    Transactions of the Visualization Society of Japan   21 ( 2 )   24 - 30   2001

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    A new method to measure local heat flux distribution from capsule surface in packed bed of ice thermal storage capsule using magnetic resonance imaging (MRI) was developed to investigate nonuniform heat transfer phenomena in porous media. In this method, local heat flux distribution from a capsule was calculated from freezing rate of water in the capsule cooled by brine below 0&deg;C in a time interval. The mean heat flux of single capsule surface under uniform flow obtained by this method agrees with one by the conventional method. By applying this method to packed bed, heat flux distributions on capsule surfaces in packed bed were measured, and axial velocity distributions of brine through packed bed were obtained by the phase method in MRI techniques. Based on these results, it was found that heat exchange effectiveness of brine through channel was lower than that through the region where channel flow was not induced. In addition, time-variations of overall heat transfer coefficient of packed bed at different flow rates were obtained.

    DOI: 10.3154/tvsj.21.24

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  • 超電導応用のための超流動ヘリウム技術 超流動ヘリウムの伝熱シミュレーションの数値安定性

    関口基之, 末包哲也, 岡村哲至, 平井秀一郎

    低温工学   36 ( 12 )   675 - 681   2001

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  • The Superfluid Helium Technology for Superconducting Application. Numerical Stability Condition for Heat Transfer Simulation of Superfluid Helium.

    関口基之, 末包哲也, 岡村哲至, 平井秀一郎

    低温工学   36 ( 12 )   675 - 681   2001

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  • K-1220 MRI measurement for fluid motion of clay at a sudden contraction step

    TSUSHIMA Shohji, HASEGAWA Atsushi, SUEKANE Tetsuya, HIRAI Shuichiro, TANAKA Yoshihiro, NAKASUJI Yoshizumi

    The proceedings of the JSME annual meeting   1   103 - 104   2001

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    Magnetic Resonance Imaging(MRI) is applied to measure velocity inside clay that intrudes at a sudden contraction step. The experiments were conducted with a specially-designed non-magnetic apparatus on which two type of contraction step can be assembled. It is demonstrated that a tagging pulse method gives satisfactory MR images of clay which leads to measure fluid velocity of clay in a quantitative manner. It is also revealed that slip velocity between clay and wall depends on fluid velocity, that is of importance to conduct numerical simulation in determining boundary condition. Finally, expeirmental data are compared with those obtained by numeical calculation where power-law model were applied to clay as non-Newtonian fluid.

    DOI: 10.1299/jsmemecjo.II.01.1.0_103

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  • E120 NMR measurement for water diffusivity in polymer electrolyte membrane

    TSUSHIMA Shohji, TERANISHI Kazuhiro, HIRAI Shuichiro

    Proceedings of thermal engineering conference   2001   223 - 224   2001

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    Self diffusion coefficients of water in polymer electrolyte fuel cell membrane(PEM) were measured using pulsed field gradient spin echo NMR measurement. Two types of PEM sample were investigated at various water content. It is shown that measured self-diffusion coefficients increased with water content in the membane, although no distinct difference was observed among two types of PEM. Furthermore, it is demonstrated that NMR imaging technique can be applied to probe water behaviors in PEM assembled in fuel cell under operation. It is shown that PEM gradually dried after the fuel cell began to be operated, resulting in decreasing output current.

    DOI: 10.1299/jsmeptec.2001.0_223

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  • Massive CO2 clathrate hydrate growth at a high-polar-energy surface

    Y Tabe, S Hirai, K Okazaki

    JOURNAL OF CRYSTAL GROWTH   220 ( 1-2 )   180 - 184   2000.11

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  • Measurement of CO2 hydrate film thickness based on mass transport mechanism

    Y Tabe, S Hirai, K Okazaki

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   33 ( 4 )   612 - 616   2000.8

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  • Simultaneous measurement of temperature and velocity maps by inversion recovery tagging method

    K Ogawa, M Tobo, N Iriguchi, S Hirai, K Okazaki

    MAGNETIC RESONANCE IMAGING   18 ( 2 )   209 - 216   2000.2

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  • High-pressure magnetic resonance imaging up to 40 MPa

    S Hirai, K Kuwano, K Ogawa, N Iriguchi, K Okazaki

    MAGNETIC RESONANCE IMAGING   18 ( 2 )   221 - 225   2000.2

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  • MRI measurement of heat transfer in packed bed of spherical ice thermal storage capsule

    OGAWA Kuniyasu, BECK Mitsuhiro, HASEGAWA Hiromi, HASHIMOTO Katsumi, HIRAI Shuichiro

    The proceedings of the JSME annual meeting   2000   437 - 438   2000

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    A new method to measure local heat flux distribution from capsule surface in packed bed of ice thermal storage capsule using magnetic resonance imaging (MRI) was developed. In this method, local heat flux distribution from a capsule was calculated from freezing rate of water in the capsule cooled by brine below 0℃ in a time interval. By applying this method to packed bed, heat flux distributions from capsule surfaces in packed bed were measured, and axial velocity distributions of brine through packed bed were obtained by phase method in MRI techniques. Based on these results, it was found that heat exchange effectiveness of brine through channel was lower than that through other area. In addition, time-variations of overall heat transfer coefficient of packed bed at different flow rates were obtained.

    DOI: 10.1299/jsmemecjo.2000.4.0_437

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  • MRI measurement of hydrate growth and an application to advanced CO2 sequestration technology

    S Hirai, Y Tabe, K Kuwano, K Ogawa, K Okazaki

    GAS HYDRATES: CHALLENGES FOR THE FUTURE   912 ( 1 )   246 - 253   2000

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  • 充てん層内流動と空隙構造の相関: 第 1 報, MRI による軸方向流速分布の計測と軸方向チャンネル流の可視化

    小川邦康, 横内康夫, 平井秀一郎

    日本機械学会論文集 B 編   66 ( 642 )   445 - 452   2000

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  • Lateral Growth Rates of CO_2 Clathrate-hydrate Film

    Hirai, Shuichiro, Tabe, Yutaka, Kamijo, Satoshi, OKAZAKI, Ken

    Thermal science and engineering   8 ( 5 )   2000

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  • Clathrate Hydrates of Natural Gases Clathrate Hydrates of Natural Gases, 24-66, 1990

    Tabe, Yutaka, Hirai, Shuichiro, Okazaki, Ken

    Journal of chemical engineering of Japan   33 ( 4 )   612 - 616   2000

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  • ネットワーク構造に基づく 2 次元周期的多孔質体の透過係数モデル

    岡本征雄, 平井秀一郎

    Thermal science and engineering   8 ( 6 )   23 - 31   2000

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  • Correlation between interstitial flow and pore structure in packed bed (1st Report, Axial Velocity Measurement using MRI and Visualization of Axial Channel Flow) Reviewed

    Kuniyasu Ogawa, Yasuo Yokouchi, Shuichiro Hǐrai

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   66 ( 642 )   445 - 452   2000

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    DOI: 10.1299/kikaib.66.445

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  • Measurement of clathrate-hydrate film thickness formed at the interface between liquid CO2 and water Reviewed

    Y Tabe, S Hirai, K Okazaki

    GREENHOUSE GAS CONTROL TECHNOLOGIES   311 - 315   1999

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  • Three-dimensional structure and local velocity measurement in porous media by magnetic mesonance imaging

    Ogawa, Kuniyasu, Matsuka, Takeshi, Hirai, Shuichiro, Okazaki, Ken

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   65 ( 633 )   1680 - 1687   1999

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  • 熱的単位操作 (上) 熱的単位操作 (上) Capter 4, 1976

    稲葉英男, 吉村充司, 尾崎公一, 小川邦康, 松家剛, 平井秀一郎, 岡崎健

    日本機械学会論文集. B 編   65 ( 633 )   1680 - 1687   1999

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  • 磁気共鳴イメージングによる温度・流れ場の同時計測法の開発

    小川邦康, 當房誠, 入口紀男, 平井秀一郎, 岡崎健

    日本機械学会論文集 B 編   65 ( 636 )   2791 - 2798   1999

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  • 熱流体計測における先端技術熱流体計測における先端技術 112, 1996

    小川邦康, 松家剛, 平井秀一郎, 岡崎健

    日本機械学会論文集. B 編   65 ( 633 )   1680 - 1687   1999

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  • MRI による多孔質構造と空隙内局所流動の三次元計測

    小川邦康, 松家剛, 平井秀一郎, 岡崎健

    日本機械学会論文集 B 編   65 ( 633 )   1680 - 1687   1999

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  • 充てん層内流動と空隙構造の相関 (第 1 報, MRI による軸方向流速分布の計測と軸方向チャンネル流の可視化)

    小川邦康, 別宮光洋, 長谷川浩巳, 橋本克巳, 平井秀一郎, 松家剛, 岡崎健

    日本機械学会論文集. B 編   65 ( 633 )   1680 - 1687   1999

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  • 熱流体の新しい計測法熱流体の新しい計測法, 1998

    小川邦康, 當房誠, 入口紀男, 平井秀一郎, 岡崎健

    日本機械学会論文集. B 編   65 ( 636 )   2791 - 2798   1999

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  • パルスおよびフーリエ変換 NMR パルスおよびフーリエ変換 NMR 28, 1976

    小川邦康, 當房誠, 入口紀男, 平井秀一郎, 岡崎健

    日本機械学会論文集. B 編   65 ( 636 )   2791 - 2798   1999

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  • A new method for simultaneous measurement of temperature and velocity maps by magnetic resonance imaging

    Kuniyasu Ogawa, Makoto Tobo, Norio Iriguchi, Shuichiro Hirai, Ken Okazaki

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   65 ( 636 )   2791 - 2798   1999

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    DOI: 10.1299/kikaib.65.2791

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  • Temperature and Velocity Measurements of Interstitial Flows by Magnetic Resonance Imaging

    Ogawa, Kuniyasu, Hirai, Shuichiro, Okamoto, Ikuo, OKAZAKI, Ken

    Thermal science and engineering   7 ( 6 )   121 - 128   1999

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  • Dissolution Mechanism of Liquid CO_2 with Hydrate Film at the Interface in High Pressurized Water and its Thermodynamic Consideration

    TABE Yutaka, HIRAI Shuichiro, OKAZAKI Ken, KAWAMURA Katsuyuki, HIJIKATA Kunio

    Transactions of the Japan Society of Mechanical Engineers. Series B.   64 ( 623 )   2189 - 2195   1998

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    Dissolution of liquid CO_2 accompanied by CO_2 clathrate-hydrate film into sea water is observed at CO_2 sequestration in ocean, which is considered to be an effective strategy of CO_2 mitigation. The dissolution mechanism was experimentally investigated by considering the relation between measured CO_2 surface concentration of hydrate-covered CO_2 droplets and CO_2 solubility. It was made clear that, in the temperature range of hydrate formation, the measured surface concentration decreases with the decrease of temperature and it exactly corresponds to CO_2 solubility. This fact indicates that the dissolution rate of a CO_2 droplet with hydrate film is controlled by the mass transfer rate of dissolved CO_2 at the droplet surface into water and the decrease of dissolution rate is caused by the decrease of CO_2 solubility in the hydrate formation region. Further, in order to clarify the decreasing mechanism of CO_2 solubility, a thermodynamic method was employed. CO_2 solubility was estimated from the relationship between the molar Gibbs free energy of water-liquid CO_2 mixture and that of hydrate and it has shown that the present method could predict the decrease of CO_2 solubility in hydrate formation region fairly well.

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  • Mass transport phenomena of liquid CO2 with hydrate

    Hirai, Shuichiro, Okazaki, Ken, Tabe, Yutaka, Hijikata, Kunio

    Waste Management   17 ( 5月6日 )   353 - 360   1998

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  • Thermodynamical explanation of dissolution mechanism of liquid CO2 with clathrate-hydrate film

    Y Tabe, S Hirai, K Okazaki, K Kawamura, K Hijikata

    HEAT TRANSFER 1998, VOL 5   75 - 80   1998

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  • Direct synthesis of methanol from methane and water-vapor mixture using ultra-dhort pulse plasma

    Okazaki, Ken, Yamada, Nobuhide, Kishida, Takuya, Ogawa, Kuniyasu, Hirai, Shuichiro

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   64 ( 625 )   3052 - 3059   1998

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  • 極短パルスプラズマによるメタン・水からのメタノール直接合成

    岡崎健, 山田展英, 岸田拓也, 小川邦康, 平井秀一郎

    日本機械学会論文集 B 編   64 ( 625 )   3052 - 3059   1998

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  • 気体放電気体放電 42, 1992

    岡崎健, 山田展英, 岸田拓也, 小川邦康, 平井秀一郎

    日本機械学会論文集. B 編   64 ( 625 )   3052 - 3059   1998

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  • 高圧水との界面にハイドレート膜を伴う液体 CO2 の溶解機構とその熱力学的考察

    田部豊, 平井秀一郎, 岡崎健, 河村雄行, 土方邦夫

    日本機械学会論文集 B 編   64 ( 623 )   2189 - 2195   1998

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  • プラズマ材料科学ハンドブックプラズマ材料科学ハンドブック, 748-766, 1992

    岡崎健, 山田展英, 岸田拓也, 小川邦康, 平井秀一郎

    日本機械学会論文集. B 編   64 ( 625 )   3052 - 3059   1998

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  • Mass and Momentum Transport Phenomena at Vortex Pairing in a Mixing Layer (Analysis using Direct Numerical Simulation)

    HIRAI Shuichiro, TANIGUCHI Taichi, TAKAGI Toshimi

    Transactions of the Japan Society of Mechanical Engineers. Series B.   64 ( 621 )   1299 - 1303   1998

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    Mass and momentum transport phenomena in the process of vortex pairing in a spatially developing mixing layer is discussed based on the instantaneous velocity and scalar database obtained from the direct numerical simulation using 4-th order central difference scheme. It was pointed out that, as for the momentum transport, a gradient diffusion is dominant in the first half of pairing process and a counter-gradient diffusion occurs in the latter half process. On the other hand, a gradient diffusion is induced and pronounced for the mass transport in the whole process of vortex merging. A detail mechanism is discussed by analyzing the behavior of u′v′ and v′c′, which respectively represents the momentum and mass transport, in the vortex pairing process.

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  • Analysis on retardation of mass transport in a mixing layer using direct numerical simulation Reviewed

    S Hirai, T Taniguchi, T Takagi

    KAGAKU KOGAKU RONBUNSHU   23 ( 6 )   947 - 953   1997.11

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  • Molecular dynamics simulation for the formation of argon clathrate-hydrate structure

    S Hirai, K Okazaki, S Kuraoka, K Kawamura

    MICROSCALE THERMOPHYSICAL ENGINEERING   1 ( 4 )   293 - 301   1997.10

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  • Plasma chemical reactions at atmospheric pressure for high efficiency use of hydrocarbon fuels Reviewed

    K Okazaki, S Hirai, T Nozaki, K Ogawa, K Hijikata

    ENERGY   22 ( 2-3 )   369 - 374   1997.2

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    DOI: 10.1016/S0360-5442(96)00129-6

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  • Dissolution rate of liquid CO2 in pressurized water flows and the effect of clathrate films

    S Hirai, K Okazaki, Y Tabe, K Hijikata, Y Mori

    ENERGY   22 ( 2-3 )   285 - 293   1997.2

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  • Measurement of CO2 diffusion coefficient and application of LIF in pressurized water Reviewed

    S Hirai, K Okazaki, H Yazawa, H Ito, Y Tabe, K Hijikata

    ENERGY   22 ( 2-3 )   363 - 367   1997.2

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  • 混合層における物質輸送抑制現象の DNS 解析

    平井秀一郎, 谷口太一, 高城敏美

    化学工学論文集   23 ( 6 )   947 - 953   1997

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  • 高電圧極短パルスプラズマ構造形成過程の解析

    岡崎健, 安田真一, 平井秀一郎

    日本機械学会論文集 B 編   63 ( 610 )   2166 - 2174   1997

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  • Development of Visualization Method of Temperature and Flow Fields in Non-Transparent Media by Magnetic Resonance Imaging

    小川邦康, 當房誠, 入口紀男, 平井秀一郎, 岡崎健

    可視化情報学会誌   17 ( 2 )   297 - 300   1997

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  • プラズマの分光計測プラズマの分光計測, 107-109, 1995

    岡崎健, 安田真一, 平井秀一郎

    日本機械学会論文集. B 編   63 ( 610 )   2166 - 2174   1997

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  • エネルギーシステム評価のための簡易ソフトウェア開発

    土方邦夫, 平井秀一郎, 岡崎健, 小塚勝彦

    エネルギー・資源   18 ( 4 )   395 - 391   1997

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  • C224 MRI による非透過性物体内の温度・流れ場の可視化法の開発

    小川邦康, 當房誠, 入口紀男, 平井秀一郎, 岡崎健

    可視化情報学会誌   17 ( Supplement2 )   297 - 300   1997

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  • 直接シミュレーションを用いた混合層における運動量輸送抑制現象の解析

    平井秀一郎, 高城敏美, 谷口太一, 戒田純一

    日本機械学会論文集 B 編   63 ( 606 )   404 - 409   1997

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  • Numerical simulation for dissolution of liquid CO2 droplets covered with clathrate film in intermediate depth of ocean Reviewed

    S Hirai, K Okazaki, Y Tabe, K Hijikata

    ENERGY CONVERSION AND MANAGEMENT   38   S313 - S318   1997

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  • 気体放電現象気体放電現象, 175-177, 1964

    岡崎健, 安田真一, 平井秀一郎

    日本機械学会論文集. B 編   63 ( 610 )   2166 - 2174   1997

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  • CO2 clathrate-hydrate formation and its mechanism by molecular dynamics simulation Reviewed

    S Hirai, K Okazaki, Y Tabe, K Kawamura

    ENERGY CONVERSION AND MANAGEMENT   38   S301 - S306   1997

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  • Study for the stability of CO2 clathrate-hydrate using molecular dynamics simulation Reviewed

    S Hirai, K Okazaki, S Kuraoka

    ENERGY CONVERSION AND MANAGEMENT   37 ( 6-8 )   1087 - 1092   1996.6

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  • Transport phenomena of liquid CO2 in pressurized water flow with clathrate-hydrate at the interface Reviewed

    S Hirai, K Okazaki, N Araki, H Yazawa, H Ito, K Hijikata

    ENERGY CONVERSION AND MANAGEMENT   37 ( 6-8 )   1073 - 1078   1996.6

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  • PARAMETERS DOMINATING SWIRL EFFECTS ON TURBULENT TRANSPORT DERIVED FROM STRESS SCALAR-FLUX TRANSPORT-EQUATION

    S HIRAI, T TAKAGI

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   38 ( 12 )   2175 - 2182   1995.8

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  • EXPERIMENTS FOR DYNAMIC BEHAVIOR OF CARBON-DIOXIDE IN DEEP-SEA

    S HIRAI, K OKAZAKI, N ARAKI, K YOSHIMOTO, H ITO, K HIJIKATA

    ENERGY CONVERSION AND MANAGEMENT   36 ( 6-9 )   471 - 474   1995.6

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  • Investigation for the stability of CO2 clathrate-hydrate using molecular dynamics simulation

    HIRAI, Shuichiro, OKAZAKI, Ken, KURAOKA, Shinsuke, KAWAMURA, Katsuyuki

    Thermal science and engineering   3 ( 3 )   69 - 74   1995

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  • NONINTRUSIVE GAS-PRESSURE MEASUREMENT BY LASER-INDUCED FLUORESCENCE FROM NO MOLECULES

    S HIRAI, T TAKAGI, T UENO

    JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING   37 ( 3 )   583 - 587   1994.8

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  • レーザプラズマ誘起蛍光を用いたガス圧力の高感度計測

    平井秀一郎, 高城敏美, 久保方宏, 中野康正

    日本機械学会論文集 B 編   59 ( 566 )   3113 - 3118   1993

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  • Pressure-Strain-Rate Model Including Effect of Streamline Curvature and Prediction of Turbulent Swirling Pipe Flow : 2nd Report, Numerical Prediction of Turbulent Decaying Swirling Flow in a Long Pipe

    Hirai Shuichiro, Takagi Toshimi, Takada Masahiko

    Transactions of the Japan Society of Mechanical Engineers. Series B.   59 ( 565 )   2782 - 2789   1993

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    Numerical predictions employing three types of stress equation models, which are those of Launder et al. , Gibson-Younis and the authors' are conducted and compared with an experiment of turbulent decaying swirling flow in a long circular pipe. The accuracy of the prediction with the authors' model is demonstrated as compared with those of Launder et al. and Gibson-Younis. Characteristic momentum transport induced by swirl is interpreted with respect to the interaction between production and pressure-strain-rate terms. In particular, it is stressed that it is important to consider the effect of isotropization on source-like terms which appear in convection terms.

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  • TURBULENT TRANSPORT OF MOMENTUM AND SCALARS IN SWIRLING FLOWS WITH AND WITHOUT COMBUSTION Reviewed

    T TAKAGI, S HIRAI

    TRANSPORT PHENOMENA IN THERMAL ENGINEERING, VOLS 1 AND 2   1 - 9   1993

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  • Pressure-Strain-Rate Model Including Effect of Streamline Curvature and Prediction of Turbulent Swirling Pipe Flow : 1st Report, Modeling of Pressure-Strain Rate Term

    Hirai Shuichiro, Takagi Toshimi, Takada Masahiko

    Transactions of the Japan Society of Mechanical Engineers. Series B.   59 ( 565 )   2777 - 2781   1993

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    A new pressure-strain-rate correlation model in a Reynolds stress equation is proposed. When a Reynolds stress equation is written in other than Cartesian coordinates, source-like terms arise in convection terms. The present model incorporates the effect of isotropization on the source-like terms. New model constants are determined to satisfy four basic criteria simultaneously : (1) the effect of streamline curvature, (2) measured stress levels in homogeneous free shear flow, (3) analytical results for rapid distortion theory and (4) return to isotropy in grid turbulence decay.

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  • Parameters Dominating Swirl Effects on Turbulent Transport derived from Stress/Flux Equation.

    Hirai Shuichiro, Takagi Toshimi

    Transactions of the Japan Society of Mechanical Engineers Series C   58 ( 547 )   921 - 928   1992

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    Parameters dominating the characteristics of turbulent transport in swirling flows are derived, paying attention to the production terms appearing in transport equations of stress and scalar flux. Signs of (vw)^^- and ∂(rW)/∂r are the factors which determine the characteristics of production of stress (uυ)^^- and flux (υc)^^-. In the case of ∂(rW)/∂r≤0 and (υw)^^->0, swirl has an effect of promotion on turbulent transport, whereas in the case of ∂(rW)/∂r>0 and (υw)^^-≤0. it has an effect of suppression. In the case of ∂(rW)/∂r>0 and (υw)^^->0, swirl can take either of the effects.

    DOI: 10.1299/kikaib.58.921

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  • NUMERICAL PREDICTION OF TURBULENT MIXING IN A VARIABLE-DENSITY SWIRLING PIPE-FLOW

    S HIRAI, T TAKAGI

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   34 ( 12 )   3143 - 3150   1991.12

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  • Prediction of turbulent mixing and combustion in the swirling flame.

    TAKAGI Toshimi, HIRAI Shuichiro, OKI Yuso

    Transactions of the Japan Society of Mechanical Engineers Series C   57 ( 534 )   715 - 720   1991

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    Numerical calculations of the flow, mixing and combustion in the turbulent swirling flame in a tube were conducted based on the density-weighted Reynolds-stress/flux equation model. Computed axial and tangential velocity components, temperature and species concentration were compared with experimental ones. Swirl effects were investigated by comparing the results of swirling and nonswirling conditions. Computations could predict the retardation of the turbulent mixing due to swirl observed in the experiment. Effects of swirl on the flow, mixing and combustion were interpreted. The importance of two types of the negative production terms, one including the swirl velocity and the other the interaction between density fluctuation and swirl-induced pressure gradient, was emphasized.

    DOI: 10.1299/kikaib.57.715

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  • 一酸化窒素分子からのレーザ誘起蛍光を用いたガス圧力の非接触計測 (新編集方針に基づく論文)

    平井秀一郎, 高城敏美, 上野徹, 久保方宏, 越智靖之

    日本機械学会論文集 B 編   57 ( 542 )   3636 - 3640   1991

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  • よう素分子からのレーザ誘起蛍光を用いたガス圧力の非接触計測 (新編集方針に基づく論文)

    平井秀一郎, 高城敏美, 上野徹, 久保方宏, 越智靖之, 岡田基裕

    日本機械学会論文集 B 編   57 ( 542 )   3630 - 3635   1991

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  • NUMERICAL PREDICTION OF FLOW CHARACTERISTICS AND RETARDATION OF MIXING IN A TURBULENT SWIRLING FLOW

    S HIRAI, T TAKAGI, T HIGASHIYA

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   32 ( 1 )   121 - 130   1989.1

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  • Numerical prediction of turbulent mixing in a variable-density swirling pipe flow.

    HIRAI Shuichiro, TAKAGI Toshimi

    Transactions of the Japan Society of Mechanical Engineers Series C   55 ( 516 )   2500 - 2507   1989

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    Numerical predictions are compared with the results of experimentation on turbulent mixing in swirling pipe flows with density nonhomogeneity induced by the mixing of He or CO2 with air. Computations employ two kinds of stress/flux equation models : The density-weighted Favre-averaged form and the density-unweighted conventional time-averaged form. The calculation based on the former model can predict that the mixing of He with air will be more strongly suppressed than the mixing of Co2, whereas the latter model fails to predict this. The possible interpretations of the interrelation between turbulent mixing, density nonhomogeneity and swirl-induced pressure gradient are presented.

    DOI: 10.1299/kikaib.55.2500

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  • PREDICTIONS OF THE LAMINARIZATION PHENOMENA IN AN AXIALLY ROTATING PIPE-FLOW

    S HIRAI, T TAKAGI, M MATSUMOTO

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME   110 ( 4 )   424 - 430   1988.12

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  • PREDICTION OF HEAT-TRANSFER DETERIORATION IN TURBULENT SWIRLING PIPE-FLOW

    S HIRAI, T TAKAGI

    JSME INTERNATIONAL JOURNAL SERIES II-FLUIDS ENGINEERING HEAT TRANSFER POWER COMBUSTION THERMOPHYSICAL PROPERTIES   31 ( 4 )   694 - 700   1988.11

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  • Numerical predictions of flow characteristics and momentum transports in a turbulent swirling pipe flow.

    HIRAI Syuichiro, TAKAGI Toshimi, HIGASHIYA Teruyoshi

    Transactions of the Japan Society of Mechanical Engineers Series C   54 ( 504 )   1962 - 1969   1988

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    Numerical predictions are compared with the experiments of turbulent swirling flow in a stationary pipe. Two kinds of turbulence models, the k-ε two equation model and the stress equation model, are applied in the present calculations. The applicability of the turbulence models is tested. The characteristics of axial and tangential velocity profile in the presence of the swirl can be predicted by applying the stress equation turbulence model, whereas the k-ε two equation model fails to predict this. The comprehensible interpretations of the phenomena, especially the retardation of the turbulent transport of momentum due to the swirl, are presented. The suppression of the transport of axial momentum in the radial direction is caused by the additional production term, including the tangential velocity component .The anisotropy of Reynolds normal stresses has the effect of transporting the tangential momentum towards the central axis.

    DOI: 10.1299/kikaib.54.1962

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  • Numerical predictions of flow characteristics and momentum transports in a turbulent swirling pipe flow.

    HIRAI Syuichiro, TAKAGI Toshimi, HIGASHIYA Teruyoshi

    Transactions of the Japan Society of Mechanical Engineers Series C   54 ( 504 )   1962 - 1969   1988

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    Numerical predictions are compared with the experiments of turbulent swirling flow in a stationary pipe. Two kinds of turbulence models, the k-ε two equation model and the stress equation model, are applied in the present calculations. The applicability of the turbulence models is tested. The characteristics of axial and tangential velocity profile in the presence of the swirl can be predicted by applying the stress equation turbulence model, whereas the k-ε two equation model fails to predict this. The comprehensible interpretations of the phenomena, especially the retardation of the turbulent transport of momentum due to the swirl, are presented. The suppression of the transport of axial momentum in the radial direction is caused by the additional production term, including the tangential velocity component .The anisotropy of Reynolds normal stresses has the effect of transporting the tangential momentum towards the central axis.

    DOI: 10.1299/kikaib.54.1962

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  • Trans. of ASME, J. Heat Transfer Trans. of ASME, J. Heat Transfer 110 (2), 378-384, 1988

    Ogawa, Kuniyasu, Hirai, Shuichiro, Okamoto, Ikuo, OKAZAKI, Ken

    Trans. of ASME   110 ( 2 )   378 - 384   1988

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  • Effect of Swirl on the Turbulent Transport of Momentum in a Concentric Annulus with a Rotating Inner Cylinder: Series B: Fluid Engineering Heat Transfer Combustion, Power Thermophysical Properties

    HIRAI, Shuichiro, TAKAGI, Toshimi, TANAKA, Kazuhiro, KIDA, Kenji

    JSME international journal: bulletin of the JSME   30 ( 268 )   1987

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  • Effect of swirl on the turbulent transport of momentum in a concentric annulus with a rotating inner cylinder.

    HlRAI Shuichiro, TAKAGI Toshimi, TANAKA Kazuhiro, KIDA Kenji

    Transactions of the Japan Society of Mechanical Engineers Series C   53 ( 486 )   432 - 437   1987

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    Experimental studies have been conducted to investigate the effects of the swirl on the turbulent transport of momentum in a concentric annulus with a rotating inner cylinder. Direct measurements of turbulent transport of momentum were made by correlating fluctuations of two velocity components which were detected by a two-color laser Doppler velocimeter. It was observed that the Reynolds stresses increse due to the swirl. The magnitude of the production terms of the transport equations of the turbulent fluxes of momentum were estimated. The dominating terms are pointed out to illustrate the processes of interactions between momentum fluxes and the swirl.

    DOI: 10.1299/kikaib.53.432

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  • Prediction of the laminarization phenomena in turbulent swirling flows.

    HIRAI Shuichiro, TAKAGI Toshimi, MATSUMOTO Masaharu

    Transactions of the Japan Society of Mechanical Engineers Series C   52 ( 476 )   1608 - 1616   1986

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    Numerical predictions are compared with the experiments of swirling turbulent flows in a tube where the swirl is derived by the tube wall rotating around the tube axis. The laminar-like flow velocity profiles and the characteristic behavior due to the swirl can be predicted by applying the stress-equations turbulent model. However, predictions applying the k-ε two-equation model do not agree with them, and their comprehensible interpretations are presented.

    DOI: 10.1299/kikaib.52.1608

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  • ふぇらむ: 日本鉄鋼協会会報= Bulletin of the Iron and Steel Institute of Japan 10 (2), 88-96, 2005-02-01

    山尾文孝, 佐々健介, 岩井一彦, 浅井滋生, 窪田征弘, 吉川昇, 谷口尚司, 末包哲也, 小路宏幸, 平井秀一郎

    J. Chem. Phys   22 ( 4 )   1954

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  • CO₂地中隔離のX線CT計測—X-ray CT of CO₂ Geological Sequestration—X線CTの計測への応用

    植村 豪, 平井 秀一郎

    非破壊検査 : Jjournal of the Japanese Society for Non-destructive Inspection / 日本非破壊検査協会 編   68 ( 5 )   231 - 235   2019.5

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  • Alteration and degradation reaction in fuel cell catalyst ink fabrication and mixing process

    植村豪, 笹部崇, 酒井勝則, 松本英俊, 杉森秀和, 篠原和彦, 平井秀一郎

    電池討論会PDF要旨集(CD-ROM)   60th   2019

  • Alteration and degradation reaction in fuel cell catalyst ink fabrication

    植村豪, 笹部崇, 酒井勝則, 松本英俊, 杉森秀一, 篠原和彦, 平井秀一郎

    日本機械学会熱工学コンファレンス講演論文集(CD-ROM)   2019   2019

  • Structural Analysis of Catalyst Layer Formation Process for Polymer Electrolyte Fuel Cell Using Time-Resolved X-ray Scattering Technique

    古賀舞都, 鴻巣裕一, 松本英俊, 戸木田雅利, 増永啓康, 引間孝明, 杉森秀一, 笹部崇, 吉田利彦, 篠原和彦, 平井秀一郎

    成形加工シンポジア   2017   2017

  • Migration and trapping phenomena of buoyancy-driven CO2 in water-saturated porous media using lattice Boltzmann method

    S. Uemura, A. Noda, S. Tsushima, S. Hirai

    Petroleum Abstracts   56 ( 19 )   98   2016.5

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    DOI: 10.1615/JPorMedia.v18.i1.70

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  • D145 Numerical simulation of mass transfer and reaction in lithium air flow battery

    Masuda Tetsutaro, Uemura Suguru, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2015   "D145 - 1"-"D145-2"   2015.10

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    Lithium air batteries have received much attention recently. However, they have a problem with their low output density due to insufficiency of oxygen. In this study, we focused on lithium air batteries with an electrolyte flow which were considered to promote oxygen transfer. We calculated an electrolyte flow and oxygen transport in the cathodes by Lattice Boltzmann Method (LBM). Then, we compared output performances and pump performances, which achieve the target output (70 kW), between various structures of the cathodes. As a result, it is considered that reducing the flow rate of the pumps is strongly required to realize the reasonable performances of lithium air flow batteries.

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  • B124 Phase change phenomena of water/methanol solution in a microchannel by utilizing PEFC exhaust heat

    Fukai Katsuyuki, Uemura Suguru, Aoki Tsutomu, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2015   "B124 - 1"-"B124-2"   2015.10

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    Compact power generation systems which consist of methanol reformer and Polymer Electrolyte Fuel Cell (PEFC) are greatly required as emergency power source. In this system, PEFC exhaust heat can be utilized for evaporating water/methanol solution before reforming. To use PEFC exhaust heat (about 80〜90 °C), a microchannel heat exchanger is suggested as an evaporator because of supplying heat more efficiently. However, phase change phenomena of water/methanol solution in a microchannel are not clarified. In this study, the double-pipe heat exchanger including the microchannel was developed. Then, phase change phenomena in the microchannel were visualized with varying concentration, flow rate and pressure.

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  • G224 Analysis of water adsorption and desorption on silica gel by X-ray CT

    Yasuda Keisuke, Uemura Suguru, Ito Mutsuhiro, Nakano Yoshio, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2015   "G224 - 1"-"G224-2"   2015.10

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    Adsorption heat pump system is expected to increase energy efficiency. However, insufficient performance of the system is still a critical issue. To improve the efficiency, fundamental phenomena of water adsorption and desorption on silica gel need to be elucidated. In this study, adsorption and desorption process on silica gel were investigated by using X-ray computed tomography. As a result, water distribution on silica gel during adsorption and desorption process was visualized successfully. The visualized images indicated that the desorption process occurs uniformly in the silica gel. On the other hand, the non-uniform water distribution was observed in the adsorption process. It suggested that the outer part of the silica gel adsorbed more water than the inner part.

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  • D143 Visualization of precipitation behavior in an electrode of an aqueous lithium-air battery by low energy X-ray CT analysis

    Furuyama Tomoaki, Uemura Suguru, Sasabe Takashi, Imanishi Nobuyuki, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2015   "D143 - 1"-"D143-2"   2015.10

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    Lithium-air battery attracts great attention because of its high energy density. The great advantage of an aqueous type is that discharge reaction products can be soluble in electrolytes. However, it precipitates in the positive electrode when the concentration of the electrolyte excesses its solubility. It is considered that the discharge reaction products cause cell performance degradation and its precipitation mechanism needs to be clarified. In this study, we observed the discharge reaction product in the positive electrode by using low energy X-ray computed tomography (CT). As a result, it was clearly shown that the discharge reaction products were mainly produced in the positive electrode near the electrolyte.

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  • D144 The effect of dissolved oxygen concentration on polarization phenomena in lithium air battery

    Torikai Kosuke, Uemura Suguru, Sasabe Takashi, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2015   "D144 - 1"-"D144-2"   2015.10

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    Lithium air batteries receive significant interest because of their extremely high theoretical energy density. However, low solubility of oxygen in aqueous electrolyte limit oxygen transport to the reaction site, and effects of dissolved oxygen concentration on battery performance have to be understood fundamentally. In this study, oxygen concentration in aqueous electrolyte and thickness of the positive electrode were changed. As a result, strong impact of dissolved oxygen concentration on discharge characteristics were observed, and importance of enhancement of the oxygen transport to the reaction site was suggested.

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  • D132 Analysis of Oil/CO_2 Miscible Process for Enhanced Oil Recovery

    KUBOTA Hideyuki, UEMURA Suguru, TSUSHIMA Shohji, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2014   "D132 - 1"-"D132-2"   2014.11

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    Improvement of the oil recovery rate is important issue for carbon dioxide enhanced oil recovery (CO_2EOR); however, effective way to improve the efficiency of CO_2EOR is still not completely understood because of complexity of dissolution phenomena; swelling, reduction of viscosity and interface tension. In this study, mixing process of decane/CO_2 was observed under miscible condition, i.e. high pressure and high temperature. As the result, dissolution phenomenon was observed directly by injecting CO_2 into decane. Dissolution process of CO_2 in decane phase was also obtained by Raman spectroscopy.

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  • H111 In-situ 3D visualization of precipitation/dissolution phenomena in a porous electrode of Lithium-air battery

    Uemura Suguru, Masuda Tetsutaro, Tsushima Shohji, Imanishi Nobuyuki, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2014   "H111 - 1"-"H111-2"   2014.11

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    The great advantage of the aqueous Li-air battery is that the discharge reaction product LiOH is soluble in H_2O; however, LiOHH2_O precipitates in the air-electrode when concentration excesses the solubility. It is considered to cause cell performance degradation, and its mechanism needs to be clarified. In this study, we succeeded to observe precipitation of solid phase on carbon fibers after discharge process and charge/discharge cycle by using a soft X-ray inclined CT. Then, the charge/discharge characteristics suggested that the solid phases degraded cell performance due to the concentration overpotential of O_2. The solid phases did not disappear despite charging because OFT was provided from the bulk before they dissolved.

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  • H123 Effect of Microstructure of Cathode MPL on Liquid Water Transport and Performance Characteristics in PEFC

    Okuhata Go, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2014   "H123 - 1"-"H123-2"   2014.11

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    Microporous layer (MPL) has a dramatic effect on water management in polymer electrolyte fuel cells (PEFCs), because its microstructure reduces liquid water accumulation at cathode CL/GDL interface. In this paper, the microstructure of MPLs fabricated from different carbon black (CB) loadings was observed using scanning electron microscope (SEM). Furthermore, the effect of CB loading of MPL on the liquid water transport and performance characteristics in a PEFC was experimentally investigated. It was found that several particle agglomerates are formed in the MPL with high CB loading of 4.0 mg/cm^2, and effective in alleviating water flooding in the cathode electrode.

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  • Research trends of CCS

    UEMURA Suguru, HIRAI Shuichiro

    Journal of the Gas Turbine Society of Japan   42 ( 4 )   310 - 316   2014.7

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  • Soft X-ray Radiography Technique for In Situ Visualization of Liquid Water in Polymer Electrolyte Membrane Fuel Cell

    13 ( 3 )   31 - 37   2014

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  • G113 Visualization of Enhanced Oil Recovery by Development of a Micro-Scale Measurement Technique for Two-Phase Flow in Porous Media

    Koike Fumiaki, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2013   201 - 202   2013.10

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    Surfactant flooding is one of the enhanced oil recovery processes to recover residual oil from oil reservoirs. It is considered that reduction of interfacial tension by surfactants improves mobility of trapped oil in porous media. However, its fundamental mechanism is not clarified. A measurement technique to visualize the two-phase flow of oil and aqueous surfactant solution in porous media was developed by using refractive index matching method. Therefore, the micro-scale dynamics of oil recovery via surfactant flooding was investigated. Mobilization and coalescence of residual oil droplets were observed through surfactant injection.

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  • I143 Effect of microporous layer on water transport in cathode electrode of PEFC

    Okuhata Go, Ohmura Kiwamu, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2013   293 - 294   2013.10

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    Microporous layer (MPL) has a dramatic effect on the durability and water management of polymer electrolyte fuel cell (PEFC). In this paper, the visualization and quantitative analysis of the liquid droplet behavior at the GDL/channel and MPL/GDL interfaces of an operating fuel cell were performed using a digital microscope, and the effect of MPL addition on the liquid water transport in the cathode electrode was investigated. It was found that the MPL addition effectively suppresses the liquid water accumulation at the cathode CL/GDL interface.

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  • I122 Numerical simulation on mass transfer in electrolyte of Lithium air battery

    Shibata Kazuki, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2013   275 - 276   2013.10

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    Li-air battery has attracted much attention because of its large theoretical capacity. Aqueous type has an advantage of avoiding an issue pore clogging because the reaction products are water soluble. Detailed assessments of material behavior in the battery are important to make practical. We have not however got the knowledge because of complexity structure at porous media of cathode side. In this study, we made a numerical simulation using Lattice Boltzmann Method (LBM) to calculate a distribution of Li^+(Cl^-), electric potential and O_2. Interpretations between the transport/reduction of Li^+ and O_2 are made in detail.

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  • D225 Development of Lattice Boltzmann Method on Two Phase Flow for CO_2 Geological Sequestration

    TSUBOI Yusuke, UEMURA Suguru, TSUSHIMA Shohji, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2013   353 - 354   2013.10

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    CO_2 geological sequestration is considered as one of the effective technology to mitigate global warming by reducing CO_2 emission into the atmosphere. A new storage method that is using micro or nano scale CO_2 was proposed to realize stable capillary trap in aquifer; however, detail of the mechanism is not clarified. In this study, we employed Lattice Boltzmann Method (LBM) to investigate the two-phase flow in the porous media. In order to realize simulation of micro-scale CO_2, stabilization methodology of two-phase separation was discussed from the view point of chemical potential. As the result, LBM of micro-scale CO_2 in the porous media was performed stably.

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  • I124 Mass transport phenomena in an electrolyte solution by MRI

    CHIBA Hiroki, IRIGUCHI Norio, TSUSHIMA Shohji, UEMURA Suguru, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2013   279 - 280   2013.10

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    Electrolyte solution is often encountered in many energy related devices, i.e., Li/Air batteries and electrolyzers. However, mass transport phenomena of Li/Air batteries are not completely clarified. We visualized mass transport phenomena in an aqueous solution of lithium chloride as an electrolyte of a Li/Air battery by using MRI. We visualized ionic transportations in the electrolyte by measuring water molecules' transportations. We electrolyzed LiClaq using a pair of carbon electrodes and a pair of copper electrodes. When LiClaq was electrolyzed using carbon electrodes, the convection like Benard cells was observed. Similarly, when we used copper electrodes, the density induced convection by copper ions was observed.

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  • J061052 Numerical Simulation of Flow Fields and Reaction Distributions in a Redox Flow Battery with an Interdigitated Channel

    TSUSHIMA Shohji, SASAKI Sho, HIRAI Shuichiro

    Mechanical Engineering Congress, Japan   2013   "J061052 - 1"-"J061052-4"   2013.9

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    Numerical investigation on two-dimensional flow fields and reaction distribution in a Vanadium redox flow battery has been presented. A numerical model with finite element method has been constructed to consider kinetics of electrode reactions, ion equilibrium and transport in an acid electrolyte solution with flow convection in porous electrodes taken into account. Cell performance and ionic species distributions in a membrane electrode assembly have been examined. It is shown that thickness of the electrodes significantly affects polarization curves of the cell, also suggesting that a thinner electrode with larger active surface area gives better performance in Vanadium redox flow batteries.

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  • In situ measurements of fuel cells and secondary batteries by high-resolution soft X-ray radiography

    4 ( 1 )   32 - 35   2013.7

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  • Understanding and Control of Transport Phenomena in Fuel Cells and Batteries under Large Flux Operation

    33 ( 7 )   35 - 43   2013.7

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  • 1111 Effects of channel pattern and wettability on plugging phenomenon of PEFC

    ISHIZAKI Yugo, NISHIDA Kosuke, TSUSHIMA Shohji, HIRAI Shuichiro

    2013 ( 88 )   "11 - 21"   2013.3

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  • 1112 Observation of liquid water behavior at cathode GDL/channel interface of PEFC based on cross-sectional visualization method

    MURANISHI Toru, NISHIDA Kosuke, TSUSHIMA Shohji, HIRAI Shuichiro

    2013 ( 88 )   "11 - 22"   2013.3

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  • F115 Effect of perforation structure of cathode GDL on liquid water removal in PEFC

    Tonoike Takeshi, Nishida Kosuke, Tsuhima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2012   173 - 174   2012.11

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    In order to alleviate liquid water flooding in polymer electrolyte fuel cells (PEFCs), it is essential to design the optimum electrode structure on cathode side. In this study, the liquid water behavior in the cathode flow field of an operating PEFC was directly visualized using a high-resolution digital CCD camera, and the effect of perforation structure of cathode gas diffusion layer (GDL) on the liquid water transport and cell performance was investigated. The perforation holes were cut in the porous GDL by electric discharge machining or micro-driling technique. It was noted that the hydrophobic perforation holes machined by the micro-driling technique are effective in removing liquid water in the cathode GDL.

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  • G125 Visualization of enhanced oil recovery by X-ray CT of two-phase flow in porous media

    Suzuki Yudai, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2012   213 - 214   2012.11

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    Improvement of oil recovery rate is of great importance for carbon dioxide enhanced oil recovery (CO_2EOR), and fundamental mechanism of Oil/CO_2 two-phase flow in porous media is need to be clarified. However, flow process is still not completely understood because of the difficluty of experimental flow visualization. In this study, CO_2 was injected into a packed bed of silica sand that was saturated by decane, and two-phase flow process of decane/CO_2 under high pressure was visualized by using micro-focus X-Ray CT. As the result, three-dimensional behavior of the CO_2 distribution was clearly observed.

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  • I114 LBM simulation of two phase imbibition and drainage in porous media.

    YAMAMOTO Tomohisa, SAKASHITA Satoshi, UEMURA Suguru, TSUSHIMA Shohji, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2012   267 - 268   2012.11

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    In the article, we conducted lattice Boltzmann simulation (LBM) to investigate microscopic two-phase flow behaviors in homogeneous sphere packing medium and heterogeneous porous medium. A two-phase LBM model showed its feasibility to independently investigate effects of contact angle and surface tension on flow behaviors It was observed that liquid water invasion was affected by hydrophobicity of the surface wall in the medium and this was attributed to meniscus formed by liquid and gas phases.

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  • F121 高温運転PEFCにおける液水挙動の軟X線in situ 可視化(OS-12: 燃料電池関連研究の新展開(2))

    ディーフンサイ ペンサイ, 笹部 崇, 津島 将司, 平井 秀一郎

    熱工学コンファレンス講演論文集   2012   175 - 176   2012.11

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    We performed in situ through-plane visualization of liquid water distribution in a polymer electrolyte fuel cell operating at 30℃, 50℃, and 70℃ by using high-resolution soft X-ray radiography. Less liquid water accumulation in the membrane electrode assembly was observed in the elevated operating temperature. These observations indicated that water generated in the electrode is mainly transported as vapor phase at higher temperature conditions. It was also confirmed that liquid water accumulation was less significant in the micro porous layer than those in the gas diffusion layer.

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  • G123 Swelling of oil by CO_2 dissolution on Enhanced Oil Recovery

    Fukushima Eisuke, Uemura Suguru, Tsushima Shohji, Harada Makoto, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2012   209 - 210   2012.11

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    Improvement of the oil recovery rate is of great importance for carbon dioxide enhanced oil recovery (CO_2EOR). However, effective way to improve the efficiency of CO_2EOR is still not completely understood because of complexity of dissolution phenomena; swelling, reduction of viscosity and interface tension. In this study, fundamental dissolution and swelling process of decane/ CO_2 was observed under high pressure. As the result, it was calculated that the rate of swelling in the vicinity of the interface increases rapidly. It was also observed that the partial pressure of CO_2 has a dominant influence on the rate of swelling.

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  • G122 Observation and analysis of Liquid-Liquid-Vapor equilibria in Carbon Dioxide + n-Alkane binary mixtures for Enhanced Oil Recovery

    Takenouchi Keisuke, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2012   207 - 208   2012.11

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    An understanding of dissolution process and phase behavior in oil/CO_2 binary system under high pressure are of great importance to improve the oil recovery rate in carbon dioxide enhanced oil recovery (CO_2EOR). However, the non-equiliborium systems are less well understood even though the equilibrium phase behaviors in the binary systems have been reported by many researchers. In this study, the non-equilibrium dissolution process in decane/CO_2 binary system was observed. CO_2 concentration disribution in the liquid phase was measured by using laser Raman spectroscopy. Moreover, liquid-liquid-vapor three phase equilibrium in decane/CO_2 binary system was successfully observed when the pressure is being reduced.

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  • F114 Effects of stoichiometry and gas humidification on water transport through membrane in low-humidity PEFC

    Asa Masaya, Nishida Kosuk, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2012   171 - 172   2012.11

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    To alleviate membrane dryout in PEFCs under low-humidity operation, it is essential to understand and control water crossover through electrolyte membrane. This paper presented a novel method for quantitatively measuring the water vapor distribution in the gas channel of a low-humidity PEFC using humidity test paper (HTP), and investigated the effects of stoichiometry and gas humidification on the water transport in the anode. Furthermore, the flow distributions of hydrogen and water vapor on the anode side were estimated based on current distribution measurement, and the local water transport coefficient through the membrane was numerically predicted. It was found that the low stoichimetric cathode flow enhances the back-diffusion of product water across the membrane, and suppresses the membrane dehydration.

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  • D204 Measurement of Liquid Water Behavior in Gas Diffusion Layer with Perforation Structure of PEFC

    TONOIKE Takeshi, NISHIDA Kosuke, TSUSHIMA Shohji, HIRAI Shuichiro

    National Symposium on Power and Energy Systems   2012 ( 17 )   347 - 348   2012.6

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    In order to alleviate liquid water flooding in polymer electrolyte fuel cells (PEFCs), it is essential to design the optimum electrode structure on cathode side. In this study, the dynamic behavior of water droplets in an operating PEFC was optically visualized using a high-resolution microscope, and the effect of perforation structure of cathode gas diffusion layer (GDL) on the liquid water transport and cell performance was investigated. The perforation holes were cut in the porous GDL by electric discharge machining and micro-drilling technique. It is noted that the hydrophobic perforation hole machined by the micro-drilling technique effectively promotes the liquid droplet removal from the cathode GDL.

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  • F222 Lattice Boltzmann Method of Supercritical-CO_2/Water Two Phase Flow in CO_2 Geological Sequestration

    Noda Atsuto, Uemura Suguru, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2011   335 - 336   2011.10

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    CO_2 geological sequestration is considered as one of the effective technology to mitigate global warming by reducing carbon dioxide (CO_2) emission into the atmosphere. However, density difference between CO_2 and water causes buoyancy effect and CO_2 migrates slowly upward in the aquifer. In order to clarify the fundamental mechanism of CO_2 migration, microscopic study of immiscible two-phase flow of CO_2 and water in porous media is necessary. In this study, Lattice Boltzmann method (LBM) for supercritical-CO_2/water two-phase flow in a porous media has been performed under geological storage condition. Migration process of CO_2 droplet was visualized and analyzed in micro pore scale.

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  • A115 Molecular dynamics of CO_2 dissolution phenomena for EOR

    Odera Atsushi, Hirai Shuichiro, Uemura Suguru, Tsushima Shohji, Kawamura Katsuyuki

    Procee[d]ings of Thermal Engineering Conference   2011   9 - 10   2011.10

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    CO_2 dissolution phenomena are important issues in enhanced oil recovery (EOR). Fundamental mechanism of them, however, is not clarified. In this study, CO_2 dissolution in cyclohexane (C_6H_<12>) was investigated by molecular dynamics simulations. Although CO_2 seems to be dissolved into C_6H_<12> which shows distinct difference to the case of CO_2/H_2O, aggregation of CO_2 molecules was observed under the condition of high CO_2 mole fraction. Furthermore, dissolution process in the CO_2/C_6H_<12> interface was enhanced in the case of supercritical CO_2, compared with that of liquid CO_2.

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  • S053021 Analysis of State of Water in Polymer Electrolyte Membrane by Raman Spectroscopy and Density Functional Theory

    TABUCHI Yuichiro, IWAMOTO Yuki, ITO Rei, TSUSHIMA Shohji, HIRAI Shuichiro

    Mechanical Engineering Congress, Japan   2011   "S053021 - 1"-"S053021-4"   2011.9

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    Proton and water transport through polymer electrolyte membrane have great impacts on the cell performance under low relative humicity and high current density operation. In particular, proton transport are strongly related to state of water in the PEM. However, its mechanism is not yet fully understood. In this study, state of water in PEM was evaluated from OH stretching vibration mode obtained by micro-Raman spectroscopy. Density functional theory was adopted for the analysis of micro-Raman results. The results suggested that OH vibration peak around 3200 cm^-1 could be due to water molecule network, which affected proton conductivity under low relative humicity condition.

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  • G205 Image Measurement of Water Droplets in Cathode Electrode of PEFC Based on Background Subtraction Method

    NISHIDA Kosuke, TANAKA Shintaro, TSUSHIMA Shohji, HIRAI Shuichiro

    National Symposium on Power and Energy Systems   2011 ( 16 )   449 - 452   2011.6

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    In order to alleviate water flooding in polymer electrolyte fuel cells (PEFCs), it is essential to understand the fundamental phenomena of liquid water transport in cathode electrode of operating fuel cell. This study presented a novel imaging technique for quantitatively evaluating the liquid water droplets discharged from the cathode gas diffusion layer (GDL) of a PEFC using background subtraction method. Furthermore, the current density distribution in the cathode was measured using segmented cell structure concept, and the water balance in the membrane electrode assembly (MEA) was investigated. It was found that the liquid water distribution on the cathode GDL surface has the maximum value in the midstream region of the counter-flow fuel cell.

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  • G204 Investigation and Control of Water Transport in Low-Humidity PEFC Using Humidity Test Paper

    HIRAE Eiki, YOKOI Yoma, NISHIDA Kosuke, TSUSHIMA Shohji, HIRAI Shuichiro

    National Symposium on Power and Energy Systems   2011 ( 16 )   447 - 448   2011.6

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    To alleviate membrane dryout in polymer electrolyte fuel cells (PEFCs) under low-humidity operation, it is necessary to control water transport inside operating fuel cell. In this study, the water vapor distribution in the anode channel of a low-humidity PEFC was quantitatively evaluated by using humidity test paper (HTP), and the effects of gas humidification and MPL addition on the water transport inside the fuel cell were investigated. It was found that the MPL addition on the cathode side significantly enhances the back diffusion of water and improves the membrane hydration.

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  • 軟X線による燃料電池内水分可視化

    津島 将司, 平井 秀一郎

    Isotope news   ( 684 )   2 - 6   2011.4

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  • G214 Observation and Raman Spectroscopy of Oil/ Supercritical CO_2 Miscible Process for Enhanced Oil Recovery

    Ito Rei, Uemura Suguru, Tsushima Shohji, Harada Makoto, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2010   363 - 364   2010.10

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    Improvement of the oil recovery rate is of great importance for carbon dioxide enhanced oil recovery (CO_2EOR). Mixing phenomena of oil/CO_2 under high pressure is one of the most fundamental mechanisms in CO_2EOR, however, the mixing process is still not completely understood because of complexity of swelling, reduction of kinetics and interface tension. In this study, fundamental mixing process of decane/CO_2 was observed under high pressure. As the result, different mixing behavior was observed by changing concentration gradient of CO_2 in oil phase with a stirrer. Raman spectra which indicated dissolution process of oil in CO_2 phase were also obtained.

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  • A222 A study of CO_2 capture and storage (CCS) on buoyancy effect in water-saturated porous media by X-ray CT

    KATAOKA Ryoto, UEMURA Suguru, TSUSHIMA Shohji, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2010   243 - 244   2010.10

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    CCS is considered as an effective technology to reduce CO_2 emissions into the atmosphere. Geological sequestration is an immediately available and technologically feasible method, however, upward migration of CO_2 is caused by gravity. The evaluation of the storage site and the assessment of CO_2 leakage risks and storage costs are needed. In this paper, experimental research on buoyancy effect of air phase in a water saturated porous media is studied. Injected air into a packed bed of glass beads containing water was visualized by micro-focus X-Ray CT. As the result, the behavior of the air phase driven by buoyancy effect was clearly observed.

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  • C212 LBM analysis on the catalyst layer with liquid water in PEMFC

    Tsubota Akihiro, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2010   275 - 276   2010.10

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    Liquid water in cathode catalyst layers (CLs) in polymer electrolyte membrane fuel cells (PEMFCs) affects performance of PEMFCs. To evaluate an effect of liquid water, we developed a calculation method with Lattice Boltzmann method (LBM) and pore network modeling (PNM). LBM was used to calculate oxygen, proton and electron transport in a model CLs while PNM was used to obtain liquid water transport. We successfully demonstrated this novel calculation method useful to investigate liquid water behaviors and its effect on overall cell performance in the cathode catalyst layer in PEMFC.

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  • C211 Investigation of PEFC electrodes by Atomic Force Microscope

    Nagai Kunio, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2010   273 - 274   2010.10

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    To improve energy efficiency with reduction of cost in polymer electrolyte fuel cells (PEFCs), optimization of PEFC electrode structure with sufficient oxygen, proton and electro supply is of great importance. Visualization of current path in catalyst layer (CLs) gives us a fruitful insight to understand the structure and mechanism of electrodes. In this study, PEFC electrodes were investigated using atomic force microscopy (AFM). We measured modeled catalyst layers deposited on stainless substrate using current sensing AFM to investigate distribution of electric current across the CLs. The conductive area decreased with ionomer content and current percolation limit was 75-80wt.% ionomer content. We also conducted AFM visualization of cross section of electrodes that was prepared by cross sectional polishing (CP) to investigate nano-scale structure of catalyst layer. It was shown that the carbon agglomerates were 35-70nm in diameter.

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  • B141 Lattice Boltzmann Simulation on Particle Transport and Deposition in Micro Porous Media

    KITAYAMA Daisuke, TSUSHIMA Shohji, SAKASHITA Satoshi, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2010   55 - 56   2010.10

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    In this article, we discuss microscopic behavior of the particle in micro porous media such as Diesel Particulate Filter (DPF). We developed a numerical simulation technique on particle transport and deposition using a Lattice Boltzmann Method, that was applied to the DPF structures obtained by micro-focus X-ray Computed Tomography. The LBM simulation on a small DPF domain showed a pressure drop curve related to the transition of filtration phenomena. We also conducted the LBM simulation on a large DPF domain. Particle deposition was identified in the middle of porous domain, resulting in variation of stream line due to particle loading.

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  • F205 Measurement of CO_2 under geological storage condition by using X-ray computed tomography with high spacial resolution

    UEMURA Suguru, KATAOKA Ryoto, FUKABORI Daichi, TSUSHIMA Shohji, HIRAI Shuichiro

    National Symposium on Power and Energy Systems   2010 ( 15 )   471 - 472   2010.6

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    The CO_2 geological storage is considered as an effective technology to reduce CO_2 emissions into the atmosphere. Field tests of CO_2 geological storage are proceeding in many part of the world recently. However, the behavior of injected CO_2 remains incompletely understood. The CO_2 behavior, storage potential and risk of leakage from reservoirs must be accurately estimated to realize practicable CO_2 storage. For these reason, laboratory-scale experimental analysis of the CO_2 behavior in the sandstone is important issues. In this study, CO_2 distribution and its behavior in the water saturated sandstone were observed by X-ray CT with high spacial resolution. As the result, CO_2 distribution and its behavior in the sandstone were clearly visualized and analyzed.

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  • Cross sectional SEM photographs of a membrane electrode assembly for polymer electrolyte fuel cell by using an ion beam polishing method

    TSUSHIMA Shohji, HIRAI Shuichiro

    49 ( 206 )   2010.1

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  • Recent Advances on In Situ Measurement of Fuel Cells

    TSUSHIMA Shohji, HIRAI Shuichiro

    Journal of the Heat Transfar Society of Japan   49 ( 206 )   14 - 22   2010.1

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  • Magnetic Resonance Imaging of Water in Operating Polymer Electrolyte Membrane Fuel Cells Reviewed

    S. Tsushima, S. Hirai

    FUEL CELLS   9 ( 5 )   506 - +   2009.10

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    DOI: 10.1002/fuce.200800151

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  • In Situ Visualization for Research & Development on Fuel Cell and Carbon Dioxide Storage

    TSUSHIMA Shohji, HIRAI Shuichiro

    Japanese journal of multiphase flow   23 ( 2 )   174 - 181   2009.6

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  • 506 Development of a stable geological storage method by liquid CO_2 ultramicronization

    UEMURA Suguru, TSUSHIMA Shohji, HIRAI Shuichiro

    2009 ( 58 )   309 - 310   2009.3

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  • Development of magnetic resonance imaging and soft X-ray radiography for water transport analysis in PEFC

    The Journal of fuel cell technology   9 ( 2 )   62 - 67,図巻頭1p   2009

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  • 研究室紹介 東京工業大学 炭素循環エネルギー研究センター 平井・津島研究室

    平井 秀一郎, 津島 将司

    水素エネルギ-システム   34 ( 3 )   50 - 52   2009

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  • Water Transport and Degradation Analysis in PEMFC by in-situ MRI Visualization Invited Reviewed

    S. Hirai, S. Tsushima

    PROTON EXCHANGE MEMBRANE FUEL CELLS 8, PTS 1 AND 2   16 ( 2 )   1337 - 1343   2008.10

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  • B11-2 Laser Measurement Techniques and MRI visualization for Fuel Cell and CO_2 sequestration R & D

    Hirai Shuichiro, Tsushima Shohji

    Procee[d]ings of Thermal Engineering Conference   2007   39 - 42   2007.11

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    This paper describes advanced laser measurement techniques and magnetic resonance imaging (MRI) visualization for thermo-fluid engineering on fuel cell and CO_2 sequestration. MRI visualization was successfully applied to measure transversal water content distributions in a polymer electrolyte fuel cell membrane, indicating that electro-osmotic drag plays an important role on membrane dehydration. Tunable diode laser absorption spectroscopy (TDLAS) was also introduced for remote optical sensing on water vapor concentration in narrow size of fuel cell channels. Two-dimensional time-series PIV captured vortex induced vibration, simulating a flow field around a CO_2 releasing pipe in CO_2 ocean sequestration.

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  • G135 Microscopic Observation of Frozen State of Water in a Porous Electrode of PEFC during Cold Startup

    Ito Hirokazu, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2007   243 - 244   2007.11

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    During cold startup of polymer electrolyte fuel cell (PEFC), water freezing in a cathode porous electrode is a critical barrier to achieve high power density, because ice particles in the catalyst layer (CL) and gas diffusion layer (GDL) block oxygen transport to the active reaction sites. In this study, we investigate water behavior inside a cathode electrode of PEFC at low temperature operations using an optical diagnostic, and show the effect of the mechanism of water freezing on the characteristic of cell voltage. The results showed that ice formation in cathode electrode during cold startup is largely affected by GDL structure.

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  • G134 Measurement of Water Content and Evaluation of Flooding in a Gas Diffusion Layer of PEFC

    Murakami Takeshi, Nishida Kosuke, Tsushima Shohji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2007   241 - 242   2007.11

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    Water management in a cathode electrode of polymer electrolyte fuel cell (PEFC) is essential for high performance operation. When the open pores inside the GDL are filled with liquid water, oxygen cannot be sufficiently supplied to reaction sites. This phenomenon known as 'water flooding' is critical to achieve high power density. In this study, we experimentally and quantitatively investigate water accumulation inside a cathode electrode of PEFC, and show the effect of it on the characteristic of cell voltage. It was found that the voltage drop due to water flooding is greatly affected by current density and oxygen partial pressure.

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  • G121 Analysis of Bi-layer Membrane Degradation in PEFC using SEM

    Shim J.Y., Tsushima S., Hirai S.

    Procee[d]ings of Thermal Engineering Conference   2007   229 - 230   2007.11

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    In this study, the membrane degradation experiments were conducted under open circuit voltage condition with high purity H_2 and O_2 under dry and fully humidified conditions to investigate which side of the membrane is severely deteriorated. For this experiments, the laminated bi-layer MEA was used to delineate the division of the membrane; anode and cathode. Based on the SEM images, it is figured out that the anode side of membrane is severely deteriorated than the cathode side of membrane under both gas supplying conditions. It is also found that the membrane under dry conditions was more deteriorated than humidified conditions.

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  • MRIを用いたCO_2地下貯留における岩石内流動に関する研究

    古川 直人, 末包 哲也, 津島 将司, 平井 秀一郎

    春季大会講演集. I, 資源編   19 ( 2 )   "企画 - 139"-"企画-142"   2007.3

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  • 314 Magnetic Resonance Imaging (MRI) as a Tool for Thermofluid Engineering

    TSUSHIMA Shohji, SUEKANE Tetsuya, HIRAI Shuichiro

    2007 ( 82 )   "3 - 20"   2007.3

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  • 格子ボルツマン法による界面張力・濡れ性を考慮した多孔質内流れ解析

    未包 哲也, 津島 将司, 平井 秀一郎

    計算数理工学レビュー   2007 ( 1 )   35 - 40   2007.3

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  • 固体高分子形燃料電池における「水」の輸送と制御 (特集:次世代エネルギーの旗手として期待される「水素・燃料電池」)

    津島 将司, 平井 秀一郎

    水   49 ( 2 )   10 - 16   2007

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  • F141 Flow analysis of the Vortex-Induced Vibration of a Circular Cylinder in high Reynolds Number Flow

    ARAHATA Taichiro, TSUSHIMA Shohji, HIRAI Shuichiro, OZAKI Masahiko

    Procee[d]ings of Thermal Engineering Conference   2006   213 - 214   2006.11

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    In CO_2 ocean sequestartion with a moving ship, oscillation of CO_2 releasing pipe by vortex induced vibration (VIV) is potential source to increase hydraulic resistance and possibly causes mechanical damage on the pipe. Wake flow formed behind the releasing pipe is to be a highly turbulent flow over critical Reynolds number. It is important to fundamentally elucidate generating mechanism of VIV around a cylinder. In this study, we investigated VIV behaviors and flow structure behind a cylinder by measuring two-dimensional velocity field with time-series particle image velocimetry (PIV). It was confirmed that oscillation of the cylinder was amplified in accordance with periodical vortex sheddling.

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  • B121 Inline mass spectroscopic analysis in exhaust gas for investigation of PEFC degradation

    Fujii Yoshinobu, Tsushima Shoji, Hirai Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2006   45 - 46   2006.11

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    In-line direct gas mass spectroscopy (DGMS) was applied for real-time monitoring of exhausted gas of a polymer electrolyte fuel cell (PEFC) in order to investigate degradation behaviors of the fuel cell. It was shown that hydrogen emission in cathode exhausted gas was larger under OCV operation than load operation, and that intermittent peaks of carbon dioxide emission in cathode exhausted gas were detected with positive sweep of cell potential, suggesting that carbon corrosion of the cathode catalyst proceed under load cycle operation.

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  • 2006A-G3-28 VIV behaviors and flow analysis of a wake flow behind a Circular Cylinder in high Reynolds Number

    Arahata Taichiro, Tsushima Shohji, Hirai Shuichiro, Ozaki Masahiko

    Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers   ( 3 )   333 - 334   2006.11

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  • 2006A-OS3-6 CO_2 dilution promoting technology near releasing point

    Hirai Shuichiro, Tsushima Shohji, Ozaki Masahiko

    Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers   ( 3 )   47 - 48   2006.11

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  • Modeling of the Flow in CO_2 Geological Storage Based on Microscopic Analysis by LBM

    SUEKANE Tetsuya, TAKIGISHI Tomoko, HIRAI Shuichiro

    Proceedings of the Annual Meeting of Japan Society of Energy and Resources   25   179 - 182   2006.6

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  • Fuel Cell Research with a Viewpoint of Combustion Research : Research Activities on PEFC at Research Center for Carbon Recycling and Energy in Tokyo Institute of Technology

    TSUSHIMA Shohji, HIRAI Shuichiro

    Journal of the Combustion Society of Japan   48 ( 144 )   180 - 186   2006.5

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  • MRIを用いたCO_2地下貯留における流動現象に関する研究

    末包 哲也, 水本 飛鳥, 古川 直人, 津島 将司, 平井 秀一郎

    春季大会講演集. I, 資源編   18 ( 2 )   5 - 6   2006.3

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  • Basic Study on Solubility and Residual Gas Trappings of CO_2 Geological Storage

    SUEKANE Tetsuya, MIZUMOTO Asuka, NOBUSO Tomohisa, HIRAI Shuichiro

    22   317 - 320   2006.1

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  • Lattice boltzmann simulation on flow fields connected with multiple side-channels

    Shohji Tsushima, Koji Moriyama, Shuichiro Hirai

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   72 ( 6 )   1613 - 1618   2006

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    DOI: 10.1299/kikaib.72.1613

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  • F142 Microscopic Analysis of Two-phase Flows in Porous Media including Wettabihty

    TAKIGISHI Tomoko, SUEKANE Tetsuya, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2005   239 - 240   2005.11

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    Storage of CO_2 to geological formations such as aquifers is considered as one of the possible options for the abatement of CO_2 emission to the atmosphere. Understandings of microscopic two-phase flows in porous media are very important to assess the long-term fate and trapping mechanism of stored CO_2. We had developed a numerical code, which simulates two-phase flow of supercritical CO_2 and water in porous media including the effect of interfacial tension, wettability, density, and viscosity by means of the lattice Boltzmann method. We investigated effect of CO_2 saturation on flow patterns of two-phase flow in a microscopic model of porous media which have highly water-wet surfaces. A present study shows that the interfacial tension affects the relative permeability of CO_2 and its bubble is trapped in porous media as non-wetting phase by capillary forces. Because the non-wetting phase selectively passes through the large pores, inhomogeneous porous structure affects the flow pattern of CO_2.

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  • G113 Lateral Distribution of Water Content in a Polymer Electrolyte Fuel Cell Membrane by Magnetic Resonance Imaging

    NANJO Takanori, TSUSHIMA Shohji, NISHIDA Kousuke, TERANISHI Kazuhiro, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2005   265 - 266   2005.11

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    Lateral distribution of water content in a polymer electrolyte membrane in an operating fuel cell was measured by using three-dimensional magnetic resonance imaging (3D-MRI), which clearly visualized not also lateral water distribution in the membrane but also condensed water in flow channels in the cell. A parallel flow and a serpentine flow were investigated. It was revealed that the membrane near the gas inlet shows lower water content compared to those near the gas outlet in both cases. It was also shown that flow pattern considerably affect water content distribution in the membrane presumably due to plugging the gas channel by condensed water droplet under fuel cell operation.

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  • G114 LBM analysis on Mass Transport in Gas Diffusion Layers in PEFC

    TSUSHIMA Shohji, SAKAGUCHI Michihiro, NISHIDA Kousuke, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2005   267 - 268   2005.11

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    Water vapor distribution in a cathode channel of polymer electrolyte fuel cell (PEFC) composed of gas supply channel and porous gas diffusion layer (GDL) is calculated by lattice Boltzmann method (LBM) in order to clarify effect of porous structure of GDL in PEFC on water distribution and dew point of supplied gas. It is shown that porosity of GDL affects maximum water concentration emerged in the GDL, resulting in increase of dew point with decrease of porosity. On the other hand, pore scale in the GDL is less influential on water concentration distribution and its resultant dew point of the supplied gas in the cathode of PEFC.

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  • Study on the Proton Transport Phenomenon in a Polymer Electrolyte Membrane by the MRI Measurement of the ^1H/^2D Replace during Operation Mode

    TERANISHI Kazuhiro, TSUSHIMA Shohji, NISHIDA Kosuke, HIRAI Shuichiro

    13 ( 4 )   55 - 56   2005.7

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  • Characteristics of the Dissolution of CO_2 in Porous Media in Geological Sequestration

    SUEKANE Tetsuya, YAMAZAKI Mitsuyuki, HIRAI Shuichiro

    Proceedings of the Annual Meeting of Japan Society of Energy and Resources   24   189 - 192   2005.6

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  • Proposal of a Method for Water Removal in a Cathode of Polymer Electrolyte Fuel Cell

    NISHIDA Kosuke, TSUSHIMA Shohji, TERANISHI Kazuhiro, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2004   37 - 38   2004.11

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    High performance operation of polymer electrolyte fuel cell (PEFC) is limited by water condensation in a cathode gas diffusion layer (GDL) because oxygen transport to reaction sites is blocked. In this study, we observe removal behavior of condensed water in a cathode of PEFC using a long-distance microscope and discuss its characteristics. Furthermore, the structure of cathode electrode for controlling water transport is proposed in order to improve cell performance. It is shown that water removal is promoted by using the cathode GDL with a slit and cell voltage is increased.

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  • Injection behaviors of gas CO_2 with hydrate

    MAEYAMA Yuichiro, HIRAI Shuichiro, SUEKANE Tetsuya, TSUSHIMA Shohji

    Procee[d]ings of Thermal Engineering Conference   2004   179 - 180   2004.11

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    Sequestration of CO_2 to geological formations such as aquifers is considered to be one of possible strategies for the abatement of CO_2 emissions to the atmosphere. Because CO_2 rises upward in underground, one of options to ensure safety is to inject CO_2 into the layer under the seabed. In this case, it is essential to understand CO_2 leakage behavior that leads to whether CO_2 leaked gas could be sequestrated in seawater or not. CO_2 gasifies and leaks from the seabed with hydrate under the high-pressure and low-temperature condition. As injection behaviors of CO_2 gas with hydrate hasn't been researched, we observed injection behaviors of CO_2 gas with hydrate from single-hole nozzle including propagation velocity.

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  • Analysis of Two-Phase Flow in Porous Media Based on in-situ Measurement by MRI.

    ISHII Toshihiro, SUEKANE Tetsuya, Tsushima SHOHJI, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2004   191 - 192   2004.11

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    This paper describes experimental research on two-phase flow of supercritical CO_2 and water in a porous medium. We used a magnetic resonance imaging (MRI) technique to directly visualize the distribution of supercritical CO_2 injected into a packed bed of glass beads containing water. In-situ saturation distributions were successfully visualized under the temperature and pressure conditions corresponding to the aquifers at the depth of about 800m. A new coreflood interpretation method proposed by Goodfield et al. was applied to in-situ saturation data to evaluate two-phase flows in porous media directly. We calculate darcy velocity of two-phase flows of super critical CO_2 and water in porous media.

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  • Advanced CO_2 dilution technology for ocean CO_2 sequestration

    Hirai Shuichiro, Sanda Hisashi, Tsushima Shoji, Muraoka Ryoichi, Ozaki Masahiko

    Procee[d]ings of Thermal Engineering Conference   2004   165 - 166   2004.11

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    CO_2 sequestration in the ocean would be a highly advanced counter-measure to global warming if biological impact induced by CO_2 dissolution into ocean water is sufficiently small. Releasing liquid CO_2 droplets from a pipe towed by a ship is effective because of dilution due to the moving release point. If liquid CO_2 droplet sizes are controlled, dissolution into ocean water while rising up due to buoyancy, would take a long distance, which leads to vertical dilution. Dilution could be enhanced by a multi-nozzle array placed in the direction of ship width. Here we show that CO_2 dilution could be effectively further promoted by dispersing liquid CO_2 droplets horizontally by a turbulent wake formed by bodies placed at upper part of the multi-nozzle array. Turbulence formed at the downstream of the bodies could enlarge the width of rising liquid CO_2 droplets by turbulent mixing between sea water and droplets. We made a measurement of flow and statistical turbulent properties needed for numerical simulation behind a body. Based on the measured data, CO_2 enhanced dilution was simulated. Increase of partial CO_2 pressureand acidification are drastically decreased as compared with the case without dilution.

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  • Numerical simulation on water transport in a PEFC cathode with porous gas diffusion layer

    SAKAGUCHI Michihiro, HIRAI Shuichiro, NISHIDA Kosuke, TSUSHIMA Shohji

    Procee[d]ings of Thermal Engineering Conference   2004   35 - 36   2004.11

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    The polymer electrolyte fuel cell (PEFC) is expected as one of the next power generation system. Although high-performance PEFC is expected, understanding of mass transfer is not enough due to the complex structure of PEFC. So it is very important to investigate the mass transfer inside the porous gas diffusion layer. We calculated the distribution of water concentration to simulate water transfer in PEFC cathode with porous gas diffusion layer. We used lattice Boltzmann method (LBM) to calculate the flow and water transfer in porous media, because LBM is easy to set boundary conditions. From these result, we suggest the way to estimate the conditions that PEFC works without flooding and concentration overvoltage.

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  • Effect of Capillary Pressure on the Flow and Leakage of Sequestered CO_2

    SUEKANE Tetsuya, TSUKAMOTO Yoshihisa, MIZUMOTO Asuka, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   193 - 194   2004

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    Carbon dioxide is considered to be the greenhouse gas which most contributes to global warming on the earth. Sequestration of CO_2 to geological formations such as aquifers is considered as one of the possible options for the abatement of CO_2 emission to the atmosphere. One of the crucial problems about geological sequestration is the leakage of CO2 from reservoirs. This paper describes numerical research on the mechanism of leakage from the reservoir through the cap-rock. Not absolute permeability of cap-rock but the difference of capillary pressure characteristics between cap-rock and reservoir governs the saturation of sequestered CO_2.

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  • Numerical simulation on two-phase flow in porous media by LBM for underground sequestration of CO_2

    TSUKAMOTO Yoshihisa, SUEKANE Tetsuya, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2003   521 - 522   2003.11

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    In this article, we employ a recently introduced numerical technique, known as lattice Boltzmann method (LBM), to numerically simulate immiscible two-phase flow in microscopic models of porous media. This model takes into account the ratio of (dynamic) viscosity, density, interfacial tension, and wettability, . The two-phase flows of supercritical CO_2 and water in a straight channel with a lot of hexagonal cylinders (imitation porous media) were simulated numerically to show the effect of (dynamic) viscosity ratio on the permeability of porous media. The imbibition of wettable liquid into porous media driven by capillary pressure can be simulated successfully.

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  • Flow field measurement of highly turbulent flow past a releasing pipe for CO_2 ocean sequestration

    MURAOKA Ryoichi, TSUSHIMA Shohji, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2003   253 - 254   2003.11

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    In CO_2 ocean sequestration, dilution process of injected CO_2 past a releasing pipe is of great importance to predict biological impact. Highly turbulent flow past the releasing pipe at supercritical Reynolds number plays an important roll for enhancement of CO_2 dilution. In this study, we investigated the highly turbulent flow field past a circular cylinder by using time-series particle image velocimetry (PIV). We measured two-dimensional velocity field and its turbulent properties such as mean velocity, turbulent intensity, and Reynolds shear stress at supercritical Reynolds number.

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  • Microscopic Observation and a Numerical Approach on Flow and Particle Deposition Behaviors in a Diesel Particulate Filter

    TSUSHIMA Shohji, SUGIYAMA Keisuke, MORIYAMA Koji, HIRAI Shuichiro, SAKASHITA Satoshi, NAKASUJI Yoshizumi

    Procee[d]ings of Thermal Engineering Conference   2003   7 - 8   2003.11

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    In this article, we discuss microscopic particle deposition behaviors in a Diesel Particulate Filter (DPF). We measured a particle deposition process in a porous side wall in the DPF by using a long range microscope connected to a CCD camera. We also monitored variation of pressure drop due to particle deposition. We confirmed that the pressure drop curve had two different modes, i.e., a rapid increase of pressure drop observed in the initial stage and a moderate increase in the later. The microscopic observations show that in the initial stage, particles are trapped inside the porous wall and that thereafter particles accumulates on its surface of the porous wall. We also conducted a lattice Boltzmann Simulation of a particle depositon process in a porous system.

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  • MRI measurement of two-phase flow in porous media for underground sequestration of CO_2

    SUEKANE Tetsuya, ISHII Toshihiro, TSUSHIMA Shoji, HIRAI Shuichiro

    Procee[d]ings of Thermal Engineering Conference   2003   517 - 518   2003.11

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    This paper describes experimental research on two-phase flow of supercritical CO_2 and water in a porous medium. We used a magnetic resonance imaging (MRI) technique to directly visualize the distribution of supercritical CO_2 injected into a packed bed of glass beads containing water. After the CO_2 displaced much of the water, about 20% of water remained in the porous medium under the condition at the depth of 1000m. Supercritical CO_2 moves upward swiftly due to buoyancy.

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  • Magnetic Resonance Imaging for Engineering applications : Measurement of polymer electrolyte fuel cell membrane

    TSUSHIMA Shohji, SUEKANE Tetsuya, HIRAI Shuichiro

    42 ( 177 )   14 - 17   2003.11

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  • Numerical simulation on two-phase flow in porous media by LBM for underground sequestration of CO_2

    SUEKANE Tetsuya, TSUKAMOTO Yoshihisa, HIRAI Shuichiro

    Fluids engineering conference ...   2003   97 - 97   2003.9

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  • Effect of water in side membrane on performance of Polymer Electrolyte Fuel Cell by direct measurement of water distribution in membrane

    TERANISHI Kazuhiro, TSUSHIMA Shohji, HIRAI Shuichiro

    22   237 - 240   2003.6

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  • D207 VISUALIZATION OF CHANNEL FLOW IN PACKED BED USING MAGNETIC RESONANCE IMAGING(Complex flow measurement) :

    OGAWA Kuniyasu, YOKOUCHI Yasuo, HIRAI Shuichiro

    Proceedings of the ... JSME-KSME Thermal Engineering Conference   2   "2 - 293"-"2-298"   2000

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    Axial velocity maps of interstitial flow through a water-saturated packed bed were measured using magnetic resonance imaging (MRI) to understand mass transport in porous media. The obtained maps showed that channel flows with higheraxial velocity were induced not only nearthe wall but also in the internal region of the packed bed, and that velocity profiles of the channel flow normalized by mean flow velocity were influenced by the Reynolds number. Furthermore, pore structure in the packed bed was characterized by partitioning of void space and connection of pore sections in the axial direction in order to analyze the flow-structure correlation. Pore characterization showed that axial channels with long void spaces in the axial direction were present in the packed bed, and that most of the channel flows with higher axial velocity were induced in the axial channels. In addition, it was found from the analysis of the flow-structure correlation that the averaged flow rate through individual axial channels is almost proportional to the square of the net cross section of the axial channel.

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  • MRIによる球状カプセル内の氷凍結・融解挙動の可視化

    橋本克巳, 小川邦康長谷川浩巳, 平井秀一郎, 岡崎健

    第36回日本伝熱シンポジウム講演論文集   II   351 - 352   1999

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  • Dissolution Behavior of Liquid CO_2 Droplet Covered with Clathrate-Hydrate in Pressurized Water Flow : CO_2 Sequestration to be Benign for the Ocean Environment

    OKAZAKI Ken, HIRAI Shu-ichiro, HIJIKATA Kunio, MORI Yasuo

    4 ( 1 )   95 - 100   1996.1

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  • CO2海洋貯留と混相流

    平井秀一郎, 岡崎健, 土方邦夫

    混相流   10 ( 1 )   12 - 22   1996

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  • エネルギーシステムの新しい評価スキームに関する研究

    土方 邦夫, 小塚 勝彦, 平井 秀一郎, 岡崎 健

    エネルギーシステム・経済・環境コンファレンス講演論文集 = Proceedings of the ... Conference on Energy, Economy, and Environment   11   177 - 182   1995.1

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  • CO2海洋貯留の動的挙動の実験と分子動力学解析

    平井秀一郎, 岡崎健, 土方邦夫

    伝熱研究   34 ( 134 )   30 - 37   1995

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  • PREDICTION OF THE LAMINARIZATION PHENOMENA IN TURBULENT SWIRLING FLOWS

    S HIRAI, T TAKAGI, M MATSUMOTO

    BULLETIN OF THE JSME-JAPAN SOCIETY OF MECHANICAL ENGINEERS   29 ( 258 )   4462 - 4462   1986.12

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Presentations

  • 海洋隔離の CO_2 希釈促進技術 (オーガナイズドセッション 12 CO_2 排出抑制技術に関する熱工学)

    平井秀一郎, 三田尚, 津島将司, 村岡良一, 尾崎雅彦

    熱工学コンファレンス講演論文集 2004  2004  一般社団法人 日本機械学会

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  • 直接加水による電解質膜の含水促進と固体高分子形燃料電池の性能向上 (マイクロ・小型分散・発電プラントにおける燃料電池最新技術, マイクロ・小型分散・発電プラントにおける燃料電池最新技術)

    津島将司, 寺西一浩, 平井秀一郎

    年次大会講演論文集 2004.3  2004  一般社団法人 日本機械学会

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  • 電解質膜の締め付けと加湿の影響を考慮した PEFC 膜内水分輸送解析 (マイクロ・小型分散・発電プラントにおける燃料電池最新技術, マイクロ・小型分散・発電プラントにおける燃料電池最新技術)

    寺西一浩, 津島将司, 福里克彦, 平井秀一郎

    年次大会講演論文集 2004.3  2004  一般社団法人 日本機械学会

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  • 電極多孔質構造を包含したカソード内水分移動の数値シミュレーション (テクニカルフォーラム 1 水素の製造・輸送・貯蔵・利用)

    阪口道洋, 平井秀一郎, 西田耕介, 津島将司

    熱工学コンファレンス講演論文集 2004  2004  一般社団法人 日本機械学会

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  • CO_2 地中隔離における貯留 流動に与える毛管圧の影響

    末包, 塚本, 佳久, 水本, 飛島, 平井秀一郎

    2004 年度熱工学コンファレンス講演論文集, 日本機械学会  2004  一般社団法人日本機械学会

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  • CO_2 地中隔離における岩石内二相流動特性の解明 (オーガナイズドセッション 12 CO_2 排出抑制技術に関する熱工学)

    石井稔宏, 末包哲也, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2004  2004  一般社団法人 日本機械学会

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  • 4318 CO_2 地下貯留における溶解・残留ガストラップに関する研究 (S59-2 温室効果ガス排出抑制技術 (2), S59 温室効果ガス排出抑制技術)

    末包哲也, 信宗知寿, 平井秀一郎

    年次大会講演論文集 2006.3  2006  一般社団法人 日本機械学会

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  • Characteristics of an immiscible flow of supercritical CO2 and water in porous media under sequestration conditions

    Suekane, Tetsuya, Ishii, Toshihiro, Tsushima, Shohji, Hirai, Shuichiro

    Greenhouse Gas Control Technologies 7  2005  Elsevier

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  • F142 濡れ性を考慮した多孔質内二相流の微視的解析 (OS-12 マイクロ・ナノスケール熱流動現象 IV)

    瀧岸知子, 末包哲也, 平井秀一郎

    熱工学コンファレンス講演論文集 2005  2005  一般社団法人 日本機械学会

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  • 3626 MRI による岩石内可視化に基づいた CO_2 地中隔離における二相流動現象の解明 (S51 温室効果ガス排出抑制技術)

    末包哲也, 石井稔宏, 津島将司, 平井秀一郎

    年次大会講演論文集 2005.3  2005  一般社団法人 日本機械学会

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  • G114 燃料電池多孔質電極内物質輸送現象の LBM 解析 (一般セッション 燃料電池 I)

    津島将司, 阪口道洋, 西田耕介, 平井秀一郎

    熱工学コンファレンス講演論文集 2005  2005  一般社団法人 日本機械学会

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  • G113 燃料電池電解質膜面内水分濃度分布の MRI 計測 (一般セッション 燃料電池 I)

    南條崇徳, 津島将司, 西田耕介, 寺西一浩, 平井秀一郎

    熱工学コンファレンス講演論文集 2005  2005  一般社団法人 日本機械学会

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  • 3625 地中隔離における多孔質内 CO_2 溶解特性の解明 (S51 温室効果ガス排出抑制技術)

    山崎光潔, 末包哲也, 平井秀一郎

    年次大会講演論文集 2005.3  2005  一般社団法人 日本機械学会

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  • Performance of Polymer Electrolyte Membrane Fuel Cell with Pressurization up to 4.0 MPa

    Tsushima, Shohji, Mibae, Tatsuro, Teranishi, Kazuhiro, Hirai, Shuichiro

    ECS Proceedings Volumes  2004  The Electrochemical Society

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  • 多孔質内二相流の LBM 解析

    末包哲也, 塚本佳久, 平井秀一郎

    理論応用力学講演会 講演論文集 第 54 回理論応用力学講演会 講演論文集  2005  日本学術会議 「機械工学委員会・土木工学・建築学委員会合同 IUTAM 分科会」

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  • 地中隔離における多孔質内 CO_2 溶解特性の解明

    末包哲也, 山崎光潔, 平井秀一郎

    研究発表会講演論文集/エネルギー・資源学会 [編]  2005  エネルギー・資源学会

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  • D224 多孔質内での残留飽和度における CO_2 の溶解特性 (OS-18 多孔質の新しい展開 II)

    末包哲也, 山崎光潔, 平井秀一郎

    熱工学コンファレンス講演論文集 2005  2005  一般社団法人 日本機械学会

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  • B104 単純配列球充填層内流れに与える Re 数の影響の MRI 計測 (オーガナイズドセッション 7: 多孔質体内の輸送現象)

    末包哲也, 横内康夫, 平井秀一郎

    熱工学講演会講演論文集 2001  2001  一般社団法人 日本機械学会

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  • 高周波電磁界が作用する管内流動の数値シミュレーション

    末包哲也, 小路宏幸, 平井秀一郎

    シンポジウム電磁力関連のダイナミックス講演論文集  2001 

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  • 502 LBM に CIP 法を適用した多孔質内高レイノルズ数流動の数値シミュレーション (OS22-1 粒子法 (格子気体法, 格子ボルツマン法など) による熱流動解析 (1))(OS22 粒子法 (格子気体法, 格子ボルツマン法など) による熱流動解析)

    島田聡彦, 平井秀一郎

    計算力学講演会講演論文集 2001.14  2001  一般社団法人 日本機械学会

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  • K-1220 磁気共鳴イメージングによる急縮流チャネル内粘土流動の計測 (S17-5 複雑流体の流れ)(S17 非ニュートン流体の複雑流路内の流れ)

    津島将司, 長谷川敦司, 末包哲也, 平井秀一郎, 田中孔浩, 中筋善淳

    年次大会講演論文集 II. 01.1  2001  一般社団法人 日本機械学会

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  • E120 PEM 内水分子拡散係数の NMR 計測 (新技術フォーラム-3: 水素利用技術の進展と熱工学的問題)

    津島将司, 寺西一浩, 平井秀一郎

    熱工学講演会講演論文集 2001  2001  一般社団法人 日本機械学会

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  • K-1617 CO_2 海洋隔離におけるハイドレート膜の特性 (J10-2 地球温暖化問題への熱・環境工学の役割 (2))(J10 地球温暖化問題への熱・環境工学の役割)

    平井秀一郎, 三田尚

    年次大会講演論文集 V. 01.1  2001  一般社団法人 日本機械学会

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  • Local heat flux measurement in an ice thermal storage capsule pack using magnetic resonance imaging

    Ogawa, Kuniyasu, Beck, Mitsuhiro, Hasegawa, Hiromi, Hashimoto, Katsumi, Hirai, Shuichiro

    International Heat Transfer Conference Digital Library  2002  Begel House Inc.

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  • B164 多孔質内における超臨界 CO_2-水の二相流動

    末包哲也, 惣川真吾, 岩谷聡, 津島将司, 平井秀一郎

    熱工学講演会講演論文集 2002  2002  一般社団法人 日本機械学会

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  • A114 ディーゼルパーティキュレートフィルター内流動と微粒子捕集のミクロ観察と予測法に関する研究

    津島将司, 杉山恵介, 盛山浩司, 平井秀一郎, 坂下俊, 中筋善淳

    熱工学コンファレンス講演論文集 2003  2003  一般社団法人 日本機械学会

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  • G121 CO_2 海洋隔離における放出管後方超高レイノルズ数乱流の計測

    村岡良一, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2003  2003  一般社団法人 日本機械学会

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  • 2333 海洋中層溶解法における CO_2 希釈の評価

    平井秀一郎, 津島将司, 三田尚, 村岡良一

    年次大会講演論文集 2003.3  2003  一般社団法人 日本機械学会

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  • G224 CO_2 地中隔離における多孔質内二相流の LBM 解析

    塚本佳久, 末包哲也, 平井秀一郎

    熱工学コンファレンス講演論文集 2003  2003  一般社団法人 日本機械学会

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  • 705 CO_2 地下貯留における多孔質内二相流の LBM 解析

    末包哲也, 塚本佳久, 平井秀一郎

    流体工学部門講演会講演論文集 2003  2003  一般社団法人 日本機械学会

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  • G222 CO_2 地中隔離における多孔質内二相流の MRI 計測

    末包哲也, 石井稔宏, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2003  2003  一般社団法人 日本機械学会

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  • 7-17. メタンからの炭素固定型水素生成 ((5) 水素 II, Session 7 新エネルギー)

    平井秀一郎, 加藤一郎, 高橋大志, 津島将司, 末包哲也

    日本エネルギー学会大会講演要旨集 第 12 回日本エネルギー学会大会  2003  一般社団法人 日本エネルギー学会

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  • E133 空間発展型反応性乱流混合層における渦と反応の DNS 解析

    平舘澄賢, 平井秀一郎

    熱工学コンファレンス講演論文集 2003  2003  一般社団法人 日本機械学会

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  • 4-5. 電解質膜厚の違いによる固体高分子形燃料電池の発電特性と膜内水分濃度分布 ((2) 分散型エネルギーシステム II, Session 4 分散型エネルギーシステム)

    津島将司, 寺西一浩, 平井秀一郎

    日本エネルギー学会大会講演要旨集 第 12 回日本エネルギー学会大会  2003  一般社団法人 日本エネルギー学会

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  • TED-AJ03-635 CO_2 SEQUESTRATION IN AQUIFERS: EXPERIMENTAL AND NUMERICAL STUDIES ON FLOW OF SUPERCRITICAL CO_2 IN POROUS MEDIA

    SUEKANE, Tetsuya, SOUKAWA, Shingo, IWATANI, Satoshi, TSUSHIMA, Shoji, HIRAI, Shuichiro

    Proceedings of the... ASME/JSME Thermal Engineering Joint Conference  2003  日本機械学会

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  • 固体高分子形燃料電池における電解質膜厚が含水状態と出力特性に与える影響

    寺西一浩, 津島将司, 平井秀一郎

    研究発表会講演論文集/エネルギー・資源学会 [編]  2003 

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  • DIRECT NUMERICAL SIMULATION OF TURBULENT REACTING JET INTRODUCING FULLY DEVELOPED TURBULENCE AT THE INLET

    Hirai, Shuichiro, Takeno, Masanori, Hiradate, Kiyotaka

    TSFP DIGITAL LIBRARY ONLINE  2003  Begel House Inc.

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  • Elucidation of hydrogen cross leak mechanism in PEFC by magnetic resonance imaging and in-line direct gas mass spectroscopy

    Tsushima, Shohji, Hirai, Shuichiro, Nanjo, Takanori, Fujii, Yoshinobu

    Nippon Dennetsu Shinpojiumu Koen Ronbunshu  2007 

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  • Optical remote sensing of oxygen and water vapor concentration in PEMFC channel by using tunable diode laser absorption spectroscopy techniques

    Fujii, Yoshinobu, Tsushima, Shohji, Hirai, Shuichiro

    ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference  2007  American Society of Mechanical Engineers Digital Collection

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  • 4-17 固体高分子形燃料電池の水分 in-situ 計測とカソードガス微量分析による水素クロスリーク機構の解明 ((4) 燃料電池 (2), Session 4 新エネルギー, 研究発表 (口頭発表))

    津島将司, 南條崇徳, 藤井義喜, 平井秀一郎

    日本エネルギー学会大会講演要旨集 第 16 回日本エネルギー学会大会  2007  一般社団法人 日本エネルギー学会

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  • 0540 溶解および残留ガストラップに基づいた CO_2 地下貯留に関する研究 (S52-2 温室効果ガス排出抑制技術 (2), S52 温室効果ガス排出抑制技術)

    末包哲也, 信宗知寿, 平井秀一郎

    年次大会講演論文集 2007.3  2007  一般社団法人 日本機械学会

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  • Experimental elucidation on rate-determining process of water transport in polymer electrolyte fuel cell membrane by magnetic resonance imaging

    Takita, Shinpei, Tsushima, Shohji, Hirai, Shuichiro, Kubo, Norio, Aotani, Koichiro

    Nippon Dennetsu Shinpojiumu Koen Ronbunshu  2007 

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  • Transport analysis of generated water and water vapor on hydration of polymer electrolyte fuel cell membrane by nuclei-labeling MRI

    Kotaka, Toshikazu, Tsushima, Shohji, Hirai, Shuichiro

    Nippon Dennetsu Shinpojiumu Koen Ronbunshu  2007 

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  • PEFC 拡散層内二相流動の LBM 数値シミュレーション

    伊藤, 平井秀一郎, 津島将司, 末包哲也

    化学工学会 研究発表講演要旨集 化学工学会第 38 回秋季大会  2006  公益社団法人 化学工学会

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  • CO_2 地下貯留における溶解・残留ガストラップに関する基礎的研究

    末包哲也, 水本飛鳥, 信宗知寿, 平井秀一郎

    エネルギーシステム・経済・環境コンファレンス講演論文集= Proceedings of the... Conference on Energy, Economy, and Environment  2006 

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  • MRI 電解質膜水分の高空間分解能計測

    川田健太郎, 津島将司, 吉田瑞穂, 藤井義喜, 平井秀一郎

    化学工学会 研究発表講演要旨集 化学工学会第 38 回秋季大会  2006  公益社団法人 化学工学会

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  • 次世代型バイオマス利用基盤技術開発戦略

    横溝修, 平井秀一郎, 大矢克

    エネルギーシステム・経済・環境コンファレンス講演論文集= Proceedings of the... Conference on Energy, Economy, and Environment  2006 

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  • F141 高レイノルズ数領域における円柱の渦励振 (VIV) 挙動と流動解析 (強制対流 2)

    荒畑太一朗, 津島将司, 平井秀一郎, 尾崎雅彦

    熱工学コンファレンス講演論文集 2006  2006  一般社団法人 日本機械学会

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  • B121 PEFC 劣化機構解明のための排ガス中微量成分 in-line 計測 (分散エネルギーシステムにおける要素技術とその集積化 2)

    藤井義喜, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2006  2006  一般社団法人 日本機械学会

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  • 2006A-G3-28 高レイノルズ数領域における渦励振 (VIV) 発生時の円柱後方乱流場の流動解析 (一般講演 (G3))

    荒畑太一朗, 津島将司, 平井秀一郎, 尾崎雅彦

    日本船舶海洋工学会講演会論文集 3  2006  公益社団法人 日本船舶海洋工学会

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  • 4317 CO_2 地下貯留におけるモニタリング技術に関する基礎的研究 (S59-2 温室効果ガス排出抑制技術 (2), S59 温室効果ガス排出抑制技術)

    山崎光潔, 末包哲也, 平井秀一郎

    年次大会講演論文集 2006.3  2006  一般社団法人 日本機械学会

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  • MRI を用いた CO_2 地下貯留における流動現象に関する研究

    末包哲也, 水本飛鳥, 古川直人, 津島将司, 平井秀一郎

    春季大会講演集. I, 資源編  2006 

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  • 水素エネルギーシステム基盤研究開発戦略

    平井秀一郎, 大矢克

    エネルギーシステム・経済・環境コンファレンス講演論文集= Proceedings of the... Conference on Energy, Economy, and Environment  2006 

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  • LBM による微視的解析に基づいた CO_2 地下貯留における流動現象のモデル化

    末包哲也, 瀧岸知子, 平井秀一郎

    研究発表会講演論文集/エネルギー・資源学会 [編]  2006  エネルギー・資源学会

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  • 314 熱流体計測のための磁気共鳴マイクロイメージング (MRI)(FM-1 熱流体計測の新展開)

    津島将司, 末包哲也, 平井秀一郎

    関西支部講演会講演論文集 2007.82  2007  一般社団法人 日本機械学会

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  • G121 積層電解質膜を用いた PEFC における劣化構造の SEM 解析 (PEFC (構造))

    沈宰暎, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2007  2007  一般社団法人 日本機械学会

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  • MRI を用いた CO_2 地下貯留における岩石内流動に関する研究

    古川直人, 末包哲也, 津島将司, 平井秀一郎

    春季大会講演集. I, 資源編  2007 

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  • 0541 CO_2 地下貯留における岩石内流動の MRI 計測 (S52-2 温室効果ガス排出抑制技術 (2), S52 温室効果ガス排出抑制技術)

    古川直人, 末包哲也, 津島将司, 平井秀一郎

    年次大会講演論文集 2007.3  2007  一般社団法人 日本機械学会

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  • G134 PEFC ガス拡散層内における水分率測定とフラッディング評価 (PEFC (水分))

    村上毅, 西田耕介, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2007  2007  一般社団法人 日本機械学会

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  • G135 氷点下起動時における PEFC 多孔質電極内水分の凍結状態の微視的観察 (PEFC (水分))

    伊藤寛和, 西田耕介, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2007  2007  一般社団法人 日本機械学会

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  • 流動電位を用いた CO_2 地下貯留におけるモニタリング技術に関する研究

    末包哲也, 山崎光潔, 平井秀一郎

    エネルギーシステム・経済・環境コンファレンス講演論文集= Proceedings of the... Conference on Energy, Economy, and Environment  2007 

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  • B304 核磁気共鳴を用いた岩石内 CO 2 流動・溶解現象の可視化

    末包哲也, 古川直人, 水本飛鳥, 津島将司, 平井秀一郎

    可視化情報学会誌  2006  社団法人 可視化情報学会

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  • 2006A-OS3-6 放出点近傍の CO_2 希釈促進 (オーガナイズドセッション (OS3): CO_2 海洋隔離研究の最新動向-海洋隔離は是か非-)

    平井秀一郎, 津島将司, 尾崎雅彦

    日本船舶海洋工学会講演会論文集 3  2006  公益社団法人 日本船舶海洋工学会

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  • B11-2 燃料電池・CO_2 隔離のレーザ・MRI 計測

    平井秀一郎, 津島将司

    熱工学コンファレンス講演論文集 2007  2007  一般社団法人 日本機械学会

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  • Investigation of Water Content Distribution in a Single-Channel PEMFC by Environmental-Controlled MRI

    Nanjo, Takanori, Tsushima, Shohji, Hirai, Shuichiro

    Meeting Abstracts  2006  The Electrochemical Society

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  • 微細ファイバセンサーによる PEFC 触媒層表面酸素濃度の光学計測

    植村豪, 吉田利彦, 饒庭竹, 笹部崇, 平井秀一郎

    熱工学コンファレンス講演論文集 2016  2016  一般社団法人 日本機械学会

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  • ヒートパイプ効率向上を目指した水滴の動的濡れ現象の解析

    植村豪, 笹部崇, 河村雄行, 平井秀一郎

    熱工学コンファレンス講演論文集 2016  2016  一般社団法人 日本機械学会

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  • Performance Degradation of PEMFC by Sea Salt Aerosol Contamination

    Uemura, Suguru, Yamazki, Munetoshi, Yoshida, Toshihiko, Jao, Ting-Chu, Hirai, Shuichiro

    Meeting Abstracts  2017  The Electrochemical Society

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  • Oxygen Concentration Measurement in the Porous Cathode of Aqueous Lithium?Air Battery By Fine Optical Fiber

    Fujimoto, Shogo, Uemura, Suguru, Imanishi, Nobuyuki, Hirai, Shuichiro

    Meeting Abstracts  2017  The Electrochemical Society

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  • Quantitative Measurement of Lithium Ion Concentration in an Operating Lib Using Low Energy X-Ray

    Komiyama, Shohei, Uemura, Suguru, Sasabe, Takashi, Kotaka, Toshikazu, Aoki, Osamu, Tabuchi, Yuichiro, Hirai, Shuichiro

    Meeting Abstracts  2018  The Electrochemical Society

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  • 水系リチウム空気電池正極構造が性能に及ぼす影響に関する研究

    植村豪, 山下雄大, 平井秀一郎

    年次大会 2018  2018  一般社団法人 日本機械学会

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  • Observation and Analysis of Nafion Solution By Frozen TEM Technology

    Yoshida, Toshihiko, Sugimori, Hidekazu, Miyazawa, Atsuo, Matsumoto, Hidetoshi, Konosu, Yuichi, Sasabe, Takashi, Uemura, Suguru, Kameya, Yuki, Terao, Takeshi, Iriguchi, Norio

    Meeting Abstracts  2016  The Electrochemical Society

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  • Impact of Catalyst Ink Stirring Condition on Oxygen Transport within PEFC

    Sasabe, Takashi, Jao, Ting-Chu, Uemura, Suguru, Yoshida, Toshihiko, Hirai, Shuichiro

    Meeting Abstracts  2016  The Electrochemical Society

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  • 微細ファイバーセンサーを用いたリチウム空気電池正極多孔質内の酸素濃度計測

    藤本翔悟, 植村豪, 今西誠之, 平井秀一郎

    年次大会 2017  2017  一般社団法人 日本機械学会

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  • 電解液内におけるイオン輸送現象の MRI タギング計測

    吉村昇三, 吉田利彦, 植村豪, 入口紀男, 亀谷雄樹, 平井秀一郎

    年次大会 2017  2017  一般社団法人 日本機械学会

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  • NUMERICAL SIMULATION OF HEAT PIPE WITH VERIFICATION OF X-RAY CT

    Uemura, Suguru, Yoshimura, Shozo, Imai, Takashi, Hirai, Shuichiro

    International Heat Transfer Conference Digital Library  2018  Begel House Inc.

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  • X-Ray CT Measurement of All Solid State Lithium-Ion Battery Under High Pressure Condition

    Kodama, Manabu, Uemura, Suguru, Miyuki, Takuhiro, Hirai, Shuichiro

    Meeting Abstracts  2019  The Electrochemical Society

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  • ADVANCED X-RAY VISUALIZATION OF FUEL CELL AND LITHIUM ION BATTERY

    Hirai, Shuichiro, Naito, H, Yoshida, T, Sasabe, Takashi, Kawamura, K, Uemura, Suguru

    International Heat Transfer Conference Digital Library  2018  Begel House Inc.

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  • Analysis of so2 Contamination Effects on PEFC Performance and Water Distribution By in-Situ Soft X-Ray Microscopy

    Sasabe, Takashi, Jao, Ting-Chu, Yamaguchi, Takahiro, Uemura, Suguru, Hirai, Shuichiro

    Meeting Abstracts  2015  The Electrochemical Society

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  • Cell Performance Improvement By Surface Modification of Porous Carbon Electrodes in Vanadium Redox Flow Battery

    Tsushima, Shohji, Kondo, Fumiya, Hirai, Shuichiro

    Meeting Abstracts  2014  The Electrochemical Society

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  • G224 シリカゲル水分吸脱着の X 線 CT 可視化解析 (OS-12: 先端計測による熱工学の学際的展開 (3))

    安田圭介, 植村豪, 伊藤睦弘, 中野義夫, 平井秀一郎

    熱工学コンファレンス講演論文集 2015  2015  一般社団法人 日本機械学会

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  • D144 溶解酸素濃度がリチウム空気電池の分極現象に及ぼす影響 (OS-05: 燃料電池・二次電池関連研究の新展開 (1))

    鳥飼孝介, 植村豪, 笹部崇, 平井秀一郎

    熱工学コンファレンス講演論文集 2015  2015  一般社団法人 日本機械学会

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  • In-Situ Visualization of Li-Ion Secondary Battery Using Soft X-Ray Microscopy

    Uemura, Suguru, Tanaka, Shogo, Sasabe, Takashi, Tabuchi, Yuichiro, Aoki, Tetsuya, Miyakubo, Hiroshi, Kurihara, Junko, Hirai, Shuichiro

    Meeting Abstracts  2015  The Electrochemical Society

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  • In-Situ Analysis of Water Distribution within PEFC Catalyst Layer By Soft X-Ray Imaging

    Sasabe, Takashi, Jao, Ting-Chu, Uemura, Suguru, Hirai, Shuichiro

    Meeting Abstracts  2015  The Electrochemical Society

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  • D145 フロー型リチウム空気電池における物質移動・反応の数値シミュレーション (OS-05: 燃料電池・二次電池関連研究の新展開 (1))

    桝田哲太郎, 植村豪, 平井秀一郎

    熱工学コンファレンス講演論文集 2015  2015  一般社団法人 日本機械学会

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  • D143 低エネルギー X 線 CT 計測による水系リチウム空気電池電極内析出挙動の可視化 (OS-05: 燃料電池・二次電池関連研究の新展開 (1))

    古山知諒, 植村豪, 笹部崇, 今西誠之, 平井秀一郎

    熱工学コンファレンス講演論文集 2015  2015  一般社団法人 日本機械学会

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  • D213 白金担持量が PEFC 電極触媒層のナノ構造と輸送現象に及ぼす影響 (OS-05: 燃料電池・二次電池関連研究の新展開 (2))

    笹部崇, 青木慶彦, 新谷彩, 饒庭竹, 平井秀一郎

    熱工学コンファレンス講演論文集 2015  2015  一般社団法人 日本機械学会

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  • B124 PEFC 低温排熱利用におけるマイクロチャンネル内メタノール水溶液の相変化現象 (OS-8: マイクロ・ナノ熱工学 (2))

    深井勝行, 植村豪, 青木努, 平井秀一郎

    熱工学コンファレンス講演論文集 2015  2015  一般社団法人 日本機械学会

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  • D207 VISUALIZATION OF CHANNEL FLOW IN PACKED BED USING MAGNETIC RESONANCE IMAGING (Complex flow measurement)

    OGAWA, Kuniyasu, YOKOUCHI, Yasuo, HIRAI, Shuichiro

    Proceedings of the... JSME-KSME Thermal Engineering Conference  2000  日本機械学会

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  • Direct numerical simulation of spatially developing mixing layer

    Hirai, Shuichiro, Takagi, Toshimi, Taniguchi, Taichi

    6th National Symposium on Computational Fluid Dynamics  1993 

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  • Calculation of turbulent swirling flow in a long pipe with Reynolds stress closure

    Hirai, Shuichiro, Takagi, Toshimi, Takada, Masahiko

    ISCFD Nagoya 1989-3rd International Symposium on Computational Fluid Dynamics  1989 

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  • 2519 MRI による氷蓄熱用球状カプセル充てん層内の熱伝達計測

    小川邦康, 別宮光洋, 長谷川浩巳, 橋本克巳, 平井秀一郎

    年次大会講演論文集 2000.4  2000  一般社団法人 日本機械学会

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  • エネルギーシステムの新しい評価スキームに関する研究

    土方邦夫, 小塚勝彦, 平井秀一郎, 岡崎健

    エネルギーシステム・経済・環境コンファレンス講演論文集= Proceedings of the... Conference on Energy, Economy, and Environment  1995 

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  • 固体高分子形燃料電池のカソード電極における凝縮水排出促進手法の提案 (テクニカルフォーラム 1 水素の製造・輸送・貯蔵・利用)

    西田耕介, 津島将司, 寺西一浩, 平井秀一郎

    熱工学コンファレンス講演論文集 2004  2004  一般社団法人 日本機械学会

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  • Measurements of Water Vapor and Current Distributions and Prediction of Water Crossover in PEMFC under Low-Humidity Conditions

    Nishida, Kosuke, Asa, Masaya, Tsushima, Shohji, Hirai, Shuichiro

    Meeting Abstracts  2012  Citeseer

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  • G125 多孔質内二相流の X 線 CT 計測による原油増進回収の可視化 (OS-9: エネルギー・CO_2 削減 (2))

    鈴木雄大, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2012  2012  一般社団法人 日本機械学会

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  • G122 原油増進回収における CO_2/油系三相平衡の可視化解析 (OS-9: エネルギー・CO_2 削減 (2))

    竹之内啓侑, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2012  2012  一般社団法人 日本機械学会

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  • G123 原油増進回収の CO_2 溶解による油の体積膨張 (OS-9: エネルギー・CO_2 削減 (2))

    福島瑛介, 植村豪, 津島将司, 原田亮, 平井秀一郎

    熱工学コンファレンス講演論文集 2012  2012  一般社団法人 日本機械学会

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  • F121 高温運転 PEFC における液水挙動の軟 X 線 in situ 可視化 (OS-12: 燃料電池関連研究の新展開 (2))

    笹部崇, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2012  2012  一般社団法人 日本機械学会

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  • F115 PEFC カソード側ガス拡散層の貫通構造が液水排出挙動に及ぼす効果 (OS-12: 燃料電池関連研究の新展開 (1))

    外池武司, 西田耕介, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2012  2012  一般社団法人 日本機械学会

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  • Effects of Wettability and Flow Direction of Cathode Channel on Plugging Phenomenon in Polymer Electrolyte Fuel Cell

    Taniguchi, Ryo, Nishida, Kosuke, Kamada, Hisashi, Tsushima, Shohji, Hirai, Shuichiro

    ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability  2011  American Society of Mechanical Engineers Digital Collection

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  • Investigation of Liquid Water Behaviors in Carbon Paper GDL for PEMFCs by Soft X-Ray Radiography

    Tsushima, Shohji, Sasabe, Takashi, Hirai, Shuichiro

    ASME/JSME 2011 8th Thermal Engineering Joint Conference  2011  American Society of Mechanical Engineers Digital Collection

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  • I114 異なる相が多孔質内に流入する過程の LBM 解析 (OS-16: 多孔質体内の熱物質輸送と応用 (1))

    山本知央, 坂下俊, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2012  2012  一般社団法人 日本機械学会

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  • Significance of Micro-Scale Mass Transport Phenomena on Fuel Cells and CO2 Sequestration

    Hirai, Shuichiro, Tsushima, Shohji, Uemura, Suguru

    ASME/JSME 2011 8th Thermal Engineering Joint Conference  2011  American Society of Mechanical Engineers Digital Collection

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  • D204 貫通構造を有する PEFC ガス拡散層内における液水挙動計測 (OS5 水素・燃料電池)

    外池武司, 西田耕介, 津島将司, 平井秀一郎

    動力・エネルギー技術の最前線講演論文集: シンポジウム 2012.17  2012  一般社団法人 日本機械学会

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  • 1111 PEFC プラッギング抑制のための流路パターン及び壁面濡れ性の有効性評価 (GS-8 動力エネルギー (1))

    石崎勇吾, 西田耕介, 津島将司, 平井秀一郎

    関西支部講演会講演論文集 2013.88  2013  一般社団法人 日本機械学会

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  • I122 リチウム空気電池電解液内物質移動の数値シミュレーション (OS-5: 燃料電池・二次電池関連研究の新展開 (2))

    柴田一喜, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2013  2013  一般社団法人 日本機械学会

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  • D225 二相系 LBM の安定化手法の開発と CO_2 地中隔離解析 (一般講演 (8))

    坪井優介, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2013  2013  一般社団法人 日本機械学会

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  • 1112 断面可視化手法による PEFC カソード側 GDL/流路界面の液水挙動観察 (GS-8 動力エネルギー (1))

    村西徹, 西田耕介, 津島将司, 平井秀一郎

    関西支部講演会講演論文集 2013.88  2013  一般社団法人 日本機械学会

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  • J061052 櫛刃構造フローバッテリーにおける反応流動シミュレーション ([J061-05] 燃料電池・二次電池におけるナノ・マイクロ現象とマクロ性能 (5): 各種電池)

    津島将司, 佐々木肖, 平井秀一郎

    年次大会 2013  2013  一般社団法人 日本機械学会

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  • G113 多孔質内二相流のミクロ計測技術開発による原油増進回収の可視化 (OS-7: マイクロ・ナノ熱工学 (1))

    小池史明, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2013  2013  一般社団法人 日本機械学会

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  • I143 PEFC カソード電極内水分輸送におけるマイクロポーラス層の影響評価 (OS-5: 燃料電池・二次電池関連研究の新展開 (4))

    奥畑剛, 大村究, 西田耕介, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2013  2013  一般社団法人 日本機械学会

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  • Visualization of Liquid Water Accumulation in PEMFCs Operating at Different Temperatures by Soft X-ray Radiography

    Deevanhxay, Phengxay, Sasabe, Takashi, Tsushima, Shohji, Hirai, Shuichiro

    Meeting Abstracts  2012  The Electrochemical Society

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  • Effects of Channel Structure and Wettability on Liquid Water Transport in Cathode of PEFC

    Ishizaki, Yugo, Taniguchi, Ryo, Nishida, Kosuke, Tsushima, Shohji, Hirai, Shuichiro

    Meeting Abstracts  2012  The Electrochemical Society

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  • I124 電解質溶液内の物質移動の MRI 計測 (OS-5: 燃料電池・二次電池関連研究の新展開 (2))

    千葉弘樹, 入口紀男, 津島将司, 植村豪, 平井秀一郎

    熱工学コンファレンス講演論文集 2013  2013  一般社団法人 日本機械学会

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  • In Situ Water Distribution Visualization in MEA by Soft X-ray Radiography

    Tsushima, Shohji, Deevanhxay, Phengxay, Sasabe, Takashi, Hirai, Shuichiro

    Meeting Abstracts  2012  The Electrochemical Society

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  • S053021 ラマン分光法・密度汎関数法による固体高分子電解質膜内の水吸着状態解析 ([S05302] 次世代電池のナノ・マイクロフルイディクス (2))

    田渕雄一郎, 岩本祐樹, 伊藤礼, 津島将司, 平井秀一郎

    年次大会 2011  2011  一般社団法人 日本機械学会

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  • Measurement of Water Content Distribution in Catalyst Coated Membrane at Water Permeation Condition by Magnetic Resonance Imaging

    Suzuki, Takahiro, Tabuchi, Yuichiro, Tsushima, Shohji, Hirai, Shuichiro, Aotani, Koichiro, Kubo, Norio

    ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology  2010  American Society of Mechanical Engineers Digital Collection

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  • A115 EOR のための CO_2 溶解現象の分子動力学解析 (OS-1: 環境・再生可能エネルギ (1))

    小寺厚, 平井秀一郎, 植村豪, 津島将司, 河村雄行

    熱工学コンファレンス講演論文集 2011  2011  一般社団法人 日本機械学会

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  • PEFC カソード流路の濡れ性が液水の排出挙動に及ぼす影響

    谷口僚, 西田耕介, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • In-Situ Observation of the Water Distribution in Porous Layers of PEMFCs by Soft X-Ray Radiography

    Sasabe, Takashi, Tsushima, Shohji, Hirai, Shuichiro

    ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology  2010  American Society of Mechanical Engineers Digital Collection

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  • X-Ray Computed Tomography of CO2 Behavior in Water Saturated Sandstone for Geological Storage

    Uemura, Suguru, Kataoka, Ryoto, Tsushima, Shohji, Hirai, Shuichiro

    2010 14th International Heat Transfer Conference  2010  American Society of Mechanical Engineers Digital Collection

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  • Quantitative Evaluation of Liquid Water at Cathode Interface of Polymer Electrolyte Fuel Cell using Near-Infrared Reflectance Spectroscopy

    Nishida, Kosuke, Ishii, Motoyuki, Taniguchi, Ryo, Tsushima, Shohji, Hirai, Shuichiro

    ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology  2010  American Society of Mechanical Engineers Digital Collection

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  • F222 地中隔離における多孔質内超臨界 CO_2/水二相流動 LBM 解析 (OS-6: 多孔質の最近の進展 (3))

    野田豊人, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2011  2011  一般社団法人 日本機械学会

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  • PEFC カソード側におけるガス拡散層の構造設計と水分排出促進に関する研究

    外池武司, 西田耕介, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • G205 背景差分法に基づく PEFC カソード電極内の液滴画像計測 (OS5 水素・燃料電池)

    西田耕介, 田中慎太郎, 津島将司, 平井秀一郎

    動力・エネルギー技術の最前線講演論文集: シンポジウム 2011.16  2011  一般社団法人 日本機械学会

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  • Soft X-Ray Investigation on the Effect of Microstructure of PEMFC Porous Layers on Liquid Water Transport

    Sasabe, Takashi, Deevanhxay, Phengxay, Tsushima, Shohji, Hirai, Shuichiro

    ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability  2011  American Society of Mechanical Engineers Digital Collection

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  • 発電時の液水挙動を考慮した PEFC 触媒層の LBM 解析

    津島将司, 坪田晶博, 平井秀一郎

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • 高圧下での密度・濃度の計測に基づく超臨界 CO2 の油への溶解現象

    平井秀一郎, 伊藤礼, 植村豪, 津島将司, 原田亮

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • ラマン分光を用いた燃料電池膜内水のミクロ構造解析

    岩本祐樹, 田渕雄一郎, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • PEFC の触媒層構造形成と発電性能

    鈴木崇弘, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • CO2 の液体溶解現象に関する分子動力学シミュレーション

    小寺厚, 平井秀一郎, 植村豪, 津島将司, 河村雄行

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • PEFC 発電時液水挙動に及ぼす GDL ミクロ構造の影響

    笹部崇, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • G204 乾燥度試験紙を用いた低加湿運転 PEFC セル内の水分輸送の解明と制御 (OS5 水素・燃料電池)

    平得永基, 横井陽馬, 西田耕介, 津島将司, 平井秀一郎

    動力・エネルギー技術の最前線講演論文集: シンポジウム 2011.16  2011  一般社団法人 日本機械学会

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  • CO2 地中隔離における浮力駆動多孔質内流動の X 線 CT 計測

    植村豪, 片岡亮人, 鈴木雄大, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 日本伝熱学会創立 50 周年記念第 48 回日本伝熱シンポジウム  2011  社団法人 日本伝熱学会

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  • Measurement of water, temperature and current distributions in anode of polymer electrolyte fuel cell during low humidity operation

    Nishida, Kosuke, Yokoi, Yoma, Umeda, Kazumasa, Tsushima, Shohji, Hirai, Shuichiro

    ASME/JSME 2011 8th Thermal Engineering Joint Conference  2011  American Society of Mechanical Engineers Digital Collection

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  • Investigation of Through-Plane Liquid Water Distribution and Its Variation with Operating Condition of PEMFC by Soft X-ray Radiography

    Deevanhxay, Phengxay, Sasabe, Takashi, Tsushima, Shohji, Hirai, Shuichiro

    Meeting Abstracts  2011  The Electrochemical Society

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  • H111 リチウム空気電池多孔質電極内の固相析出・溶解 in-situ 三次元可視化

    植村豪, 桝田哲太郎, 津島将司, 今西誠之, 平井秀一郎

    熱工学コンファレンス講演論文集 2014  2014  一般社団法人 日本機械学会

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  • D132 原油増進回収における油/CO_2 超臨界混和の解析

    久保田英之, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2014  2014  一般社団法人 日本機械学会

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  • CO 2 Trapping Phenomena in Porous Media of Geological Storage by Lattice Boltzmann Method

    Uemura, Suguru, Noda, Atsuto, Tsushima, Shohji, Hirai, Shuichiro

    International Heat Transfer Conference Digital Library  2014  Begel House Inc.

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  • Influence of cell geometry and operating parameters on performance of a redox flow battery with serpentine and interdigitated flow fields

    Tsushima, Shohji, Sasaki, Sho, Hirai, Shuichiro

    Meeting Abstracts  2013  The Electrochemical Society

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  • Performance Improvement in Redox Flow Battery With Flow-Through Channel Geometry

    Tsushima, Shohji, Sasaki, Sho, Suzuki, Takahiro, Deevanhxay, Phengxay, Hirai, Shuichiro

    ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels  2013  American Society of Mechanical Engineers Digital Collection

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  • H123 PEFC カソード側 MPL の微細構造が液水輸送と発電特性に及ぼす影響

    奥畑剛, 西田耕介, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2014  2014  一般社団法人 日本機械学会

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  • In-situ visualization of generated gas distribution in an operating direct hydrazine hydrate fuel cell by soft X-ray radiography

    Sakamoto, Tomokazu, Asazawa, Koichiro, Deevanhxay, Phengxay, Tsushima, Shohji, Hirai, Shuichiro, Tanaka, Hirohisa

    Meeting Abstracts  2013  The Electrochemical Society

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  • Visualization of Water Transport and Freezing Process in a Gas Diffusion Layer of PEFC During Low Temperature Operation

    Nishida, Kosuke, Murakami, Takeshi, Kobayashi, Kazutaka, Tsushima, Shohji, Hirai, Shuichiro

    ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference  2007  American Society of Mechanical Engineers Digital Collection

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  • Lattice Boltzmann simulation on flow fields connected with multiple side‐channels

    Tsushima, Shohji, Moriyama, Koji, Hirai, Shuichiro

    Heat Transfer?Asian Research: Co‐sponsored by the Society of Chemical Engineers of Japan and the Heat Transfer Division of ASME  2007  Wiley Online Library

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  • 2117 ガスクロスオーバの分圧依存性の評価にもとづく電解質膜劣化挙動解析 (J17-2 燃料電池 (2) 固体高分子形燃料電池, ジョイントセッション, 21 世紀地球環境革命の機械工学: 人・マイクロナノ・エネルギー・環境)

    沈宰暎, 津島将司, 平井秀一郎

    年次大会講演論文集 2008.7  2008  一般社団法人 日本機械学会

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  • PEFC カソード側ガス拡散層内における水分の可視化と定量測定

    伊藤寛和, 村上毅, 西田耕介, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 45 回日本伝熱シンポジウム  2008  社団法人 日本伝熱学会

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  • 低加湿運転 PEEC の発電特性と電極間水移動

    藤井義喜, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 45 回日本伝熱シンポジウム  2008  社団法人 日本伝熱学会

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  • PEFC 発電特性と水分輸送に及ぼすミクロ多孔質層の効果

    津島将司, 小高敏和, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 45 回日本伝熱シンポジウム  2008  社団法人 日本伝熱学会

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  • 安定地中隔離を目指した液体 CO2 の超微粒化

    植村豪, 鈴木啓祐, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 45 回日本伝熱シンポジウム  2008  社団法人 日本伝熱学会

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  • PEFC 触媒層内物質移動の格子ボルツマンシミュレーション

    瀧田晋平, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 45 回日本伝熱シンポジウム  2008  社団法人 日本伝熱学会

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  • 4-24 排ガス中微量成分 in-line 分析にもとづく PEFC 内不純物挙動の解析 ((7) 燃料電池 3, Session 4 新エネルギー)

    平井秀一郎, 盛岡弘幸, 津島将司

    日本エネルギー学会大会講演要旨集 第 17 回日本エネルギー学会大会  2008  一般社団法人 日本エネルギー学会

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  • 2120 低加湿運転 PEFC 内水分輸送が流路方向発電性能分布に及ぼす影響 (J17-3 燃料電池 (3) 固体高分子形燃料電池, ジョイントセッション, 21 世紀地球環境革命の機械工学: 人・マイクロナノ・エネルギー・環境)

    藤井義喜, 津島将司, 平井秀一郎

    年次大会講演論文集 2008.7  2008  一般社団法人 日本機械学会

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  • 4-5-3 空気極混入 SO2 による PEFC 電極被毒と性能低下機構 (4-5 燃料電池 1, Session 4 新エネルギー, 研究発表)

    北村房男, 大坂武男, 金子佳亮, 津島将司, 平井秀一郎

    日本エネルギー学会大会講演要旨集 第 19 回日本エネルギー学会大会  2010  一般社団法人 日本エネルギー学会

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  • Measurement of Water Distribution in Anode of Polymer Electrolyte Fuel Cell Under Low Humidity Conditions

    Nishida, Kosuke, Yokoi, Yohma, Tsushima, Shohji, Hirai, Shuichiro

    ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology  2009  American Society of Mechanical Engineers Digital Collection

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  • 高濃度メタノール発電のための DMFC 内物質輸送の解析と制御

    津島将司, 細谷友麿, 藤井義喜, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • 軟 X 線による PEFC 多孔質内液水輸送の高分解能可視化

    笹部崇, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • C210 EXPERIMENTAL VISUALIZATION AND NUMERICAL SIMULATION OF WATER TRANSPORT IN GAS DIFFUSION LAYER OF PEFC (Fuel Cell-2)

    NISHIDA, Kosuke, ISHII, Motoyuki, TSUSHIMA, Shohji, HIRAI, Shuichiro

    The Proceedings of the International Conference on Power Engineering (ICOPE) 2009.2  2009  The Japan Society of Mechanical Engineers

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  • 低加湿運転 PEFC のアノード電極内における反応分布の予測

    横井陽馬, 梅田一雅, 西田耕介, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • オゾン光吸収を用いた非シーディング型 PEFC 内ガス流動計測

    野田豊人, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • 超臨界・液体 CO2 の高圧砂岩内 X 線 CT 計測

    植村豪, 片岡亮人, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • A222 X 線 CT 計測を用いた水飽和多孔質中における浮力の影響に関する CCS の研究 (OS-3: 多孔質体内の伝熱 (II))

    片岡亮人, 植村豪, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2010  2010  一般社団法人 日本機械学会

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  • CO2 地中隔離における高空間分解能 X 線 CT 計測

    深堀大地, 植村豪, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • 50μm 電解質膜内水分布の高分解能 MRI 計測

    沈宰暎, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • C212 液水挙動を考慮した PEFC 触媒層の LBM 解析 (OS-5: 燃料電池関連研究の新展開 (I))

    坪田晶博, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2010  2010  一般社団法人 日本機械学会

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  • P3002-(7) 東京工業大学グローバル COE プログラム 「エネルギー学理の多元的学術融合」 における教育プログラム ([P3002] 世界で活躍する若手研究者の育成に向けた大学院博士課程教育, 特別企画)

    平井秀一郎

    年次大会講演資料集 2010.9  2010  一般社団法人 日本機械学会

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  • 湿度非平衡環境下における電解質膜水分輸送に及ぼす触媒層の影響

    鈴木崇弘, 田渕雄一郎, 津島将司, 平井秀一郎, 青谷幸一郎, 久保則夫

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • C211 固体高分子形燃料電池触媒層の AFM 計測 (OS-5: 燃料電池関連研究の新展開 (I))

    永井邦雄, 津島将司, 平井秀一郎

    熱工学コンファレンス講演論文集 2010  2010  一般社団法人 日本機械学会

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  • F205 地中隔離における砂岩内 CO_2 の高空間分解能 X 線 CT 計測 (OS11 温暖化対策と CO_2 削減技術), 動力エネルギーシステム部門 20 周年, 次の 20 年への新展開

    植村豪, 片岡亮人, 深堀大地, 津島将司, 平井秀一郎

    動力・エネルギー技術の最前線講演論文集: シンポジウム 2010.15  2010  一般社団法人 日本機械学会

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  • 東工大環境エネルギーイノベーション棟における先進エネルギー シ ステムの設計

    伊原学, 佐々木真人, 大庭正俊, 阿久津太一, 平山浩樹, 小寺豊, 三好立志, 佐久間武史, 佐藤政弘, 平井秀一郎

    化学工学会 研究発表講演要旨集 化学工学会第 42 回秋季大会  2010  公益社団法人 化学工学会

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  • G214 原油増進回収における油/超臨界 CO_2 混和形成過程の観察とラマン分光計測 (一般講演)

    伊藤礼, 植村豪, 津島将司, 原田亮, 平井秀一郎

    熱工学コンファレンス講演論文集 2010  2010  一般社団法人 日本機械学会

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  • PEFC カソード電極内水分輸送における MPL の有効性評価

    谷口僚, 西田耕介, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 47 回日本伝熱シンポジウム  2010  社団法人 日本伝熱学会

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  • B141 ミクロ多孔質における微粒子輸送・堆積の LBM 解析 (OS-4: マイクロ・ナノ熱工学 (II))

    北山大介, 津島将司, 坂下俊, 平井秀一郎

    熱工学コンファレンス講演論文集 2010  2010  一般社団法人 日本機械学会

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  • PEFC 発電特性に与える空気中微量不純物の影響解析

    盛岡弘幸, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 45 回日本伝熱シンポジウム  2008  社団法人 日本伝熱学会

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  • PEFC 膜電極複合体内の極細熱電対による温度計測

    笹部崇, 津島将司, 平井秀一郎

    化学工学会 研究発表講演要旨集 化学工学会第 40 回秋季大会  2008  公益社団法人 化学工学会

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  • クロスオーバによる電解質膜の劣化挙動解析とモデル化

    沈宰暎, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 45 回日本伝熱シンポジウム  2008  社団法人 日本伝熱学会

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  • 核ラベリング計測による PEFC 電解質膜内水分輸送解析

    藤井義喜, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • F0502 (2) 燃料電池システムおよび水素関連技術の研究開発動向: 東工大 GCOE 「エネルギー学理の多元的学術融合」 を中心として ([F0502] 燃料電池・水素技術の実用化に向けて, 先端技術フォーラム)

    平井秀一郎

    年次大会講演資料集 2009.9  2009  一般社団法人 日本機械学会

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  • 506 液体 CO_2 の超微粒化による安定地中隔離手法の開発 (OS7-2 環境エネルギー関連の流体工学諸問題 2)

    植村豪, 津島将司, 平井秀一郎

    東海支部総会講演会講演論文集 2009.58  2009  一般社団法人 日本機械学会

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  • 屈折率マッチング法を用いた複雑流路内における非混和性二液体の可視化手法開発

    植村豪, 中盛知, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • 4-5-4 SO_2 濃度と加湿条件が PEFC 電極の被毒に及ぼす影響 (4-5 燃料電池 2, Session 4 新エネルギー, 研究発表)

    金子佳亮, 津島将司, 平井秀一郎

    日本エネルギー学会大会講演要旨集 第 18 回日本エネルギー学会大会  2009  一般社団法人 日本エネルギー学会

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  • 固体高分子電解質膜の透湿過程における濃度拡散と物質伝達

    津島将司, 鶴本真介, 瀧田晋平, 平井秀一郎, 田渕雄一郎, 久保則夫, 青谷幸一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • 軟 X 線による PEFC 内液水分布の可視化

    笹部崇, 津島将司, 平井秀一郎, 南勝利, 矢田慶治

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • レーザ誘起蛍光を用いた燃料電池内ガス流動の計測

    鈴木崇弘, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • 感水試験紙による PEFC アノード側水分状態の可視化計測

    横井陽馬, 西田耕介, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • 原子間力顕微鏡による加湿条件下 PEFC 電解質膜表面ナノクラスター構造解析

    坪田晶博, 田渕雄一郎, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • PEFC 被毒に及ぼす空気中混入不純物濃度と加湿条件の影響

    金子佳亮, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • Liquid water visualization in an operating PEMFC by soft X-ray radiography

    Sasabe, Takashi, Tsushima, Shohji, Hirai, Shuichiro, Minami, Katsunori, Yada, Keiji

    ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology  2009  American Society of Mechanical Engineers Digital Collection

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  • マイクロフォーカス X 線 CT による水飽和砂岩に注入された非混和流体の可視化解析

    片岡亮人, 植村豪, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • [展望講演] 燃料電池と CO2 貯留の研究開発にみる in situ 計測がもたらす新展開

    津島将司, 平井秀一郎

    化学工学会 研究発表講演要旨集 化学工学会第 41 回秋季大会  2009  公益社団法人 化学工学会

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  • PEFC カソード触媒層における物質移動・過電圧分布の 3 次元 LBM シミュレーション

    瀧田晋平, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • 近赤外吸収分光法に基づく PEFC カソード側電極内の水分量測定

    石伊志行, 西田耕介, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • ラマン分光による PEFC 電解質膜内水の動的挙動解析

    伊藤礼, 田渕雄一郎, 津島将司, 平井秀一郎

    日本伝熱シンポジウム講演論文集 第 46 回日本伝熱シンポジウム  2009  社団法人 日本伝熱学会

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  • Analysis of Water Transport in PEFC by MRI Measurement

    Teranishi, Kazuhiro, Nishida, Kosuke, Tsushima, Shohji, Hirai, Shuichiro

    ECS Proceedings Volumes  2004  The Electrochemical Society

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  • ハイドレートを伴う CO_2 ガスの噴出挙動 (オーガナイズドセッション 12 CO_2 排出抑制技術に関する熱工学)

    前山雄一郎, 平井秀一郎, 末包哲也, 津島将司

    熱工学コンファレンス講演論文集 2004  2004  一般社団法人 日本機械学会

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  • 長期安定隔離を目指した CO_2 の貯留・漏洩メカニズムに関する研究

    末包哲也, 水本飛鳥, 平井秀一郎

    研究発表会講演論文集/エネルギー・資源学会 [編]  2004  エネルギー・資源学会

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  • CO_2 地中隔離における貯留・流動に与える毛管圧の影響 (オーガナイズドセッション 12 CO_2 排出抑制技術に関する熱工学)

    末包哲也, 塚本佳久, 水本飛島, 平井秀一郎

    熱工学コンファレンス講演論文集 2004  2004  一般社団法人 日本機械学会

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Research Projects

  • 対流起因勾配拡散と電気泳動が重畳干渉するイオン輸送現象解明と可逆電池への発展

    Grant number:22H01412  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    平井 秀一郎

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    Grant amount:\17550000 ( Direct Cost: \13500000 、 Indirect Cost:\4050000 )

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  • 対流起因勾配拡散と電気泳動が重畳干渉するイオン輸送現象解明と可逆電池への発展

    Grant number:23K22683  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    平井 秀一郎

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    Grant amount:\17550000 ( Direct Cost: \13500000 、 Indirect Cost:\4050000 )

    亜鉛空気電池は,高エネルギー密度,低コストであることから,次世代二次電池として注目されている.しかし,高速充電時に亜鉛の樹枝状結晶(デンドライト)が成長し,内部短絡によって電池機能を喪失する課題がある.デンドライトは亜鉛極表面の濃度勾配により電位差が生じ,析出先端の局所電流が大きくなることにより誘起されると推定されていることから,デンドライト成長を抑制する手法として,フロー型亜鉛空気電池を対象にしている.フロー型亜鉛空気電池は電解液の流動により亜鉛イオン分布の不均一性を抑制することができ,先行研究により電池動作の可逆性の向上が実証されている.しかし,電池動作中の亜鉛極挙動は明らかになっておらず,更なる高速充電の実現には,電解液流動条件下での亜鉛極挙動の理解が重要である.そこで本研究では,フロー型亜鉛空気電池の充電時における亜鉛極挙動の解明を目的として,電解液流動条件ならびに充電速度を変えたオペランドX線イメージングを実施した.その結果,電解液の流れなしで充電を行った場合,亜鉛はデンドライト構造で析出し,高電流密度(100 mA/cm2)条件ではデンドライトの成長速度が上がるのに対し,電解液を流動させて充電を行った場合,電流密度条件に関わらずデンドライト成長が抑制され,緻密な亜鉛析出になることが明らかになった.また,流れなしでは発生した気泡が電極表面に滞留し,反応表面積の減少により過電圧が増加するが,流れありでは電解液流動により気泡が電極表面から除去されることで,過電圧増加が抑制されることが明らかになった.本研究を総じて,電解液流動は亜鉛析出の均一化と過電圧増加の抑制により電池性能を向上させるといえる.

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  • In-situ multiple measurements for integrated elucidation of lithium/oxygen transport/reaction phenomena and battery performance improvement

    Grant number:15H02347  2015.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Hirai Shuichiro

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    Grant amount:\43940000 ( Direct Cost: \33800000 、 Indirect Cost:\10140000 )

    The lithium-air battery is the secondary battery with the largest theoretical capacity. However, high rate discharge required for practical use cannot be realized. Because the low oxygen diffusivity in the electrolyte limits the discharge performance. In this study, low energy X-ray CT, XRD, and microfiber type oxygen sensor are used to elucidate and improve the oxygen transport and reaction phenomena in the cathode.
    As a result, it was clarified that sufficient oxygen was not transported into the deep part of the cathode. The discharge reaction and precipitation of reaction products occurred near the electrode surface. Furthermore, it was shown that high rate discharge can be realized by improving the electrode structure and the impregnation state of the electrolyte.

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  • High fluxi mass transport in a narrow space by smart control of nanobubble generation/dissolution

    Grant number:15K13881  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Hirai Shuichiro

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    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    To realize a more powerful lithium-air battery, it is necessary to clarify and improve the O2 transport phenomena in the cathode. In this study, the effect of dissolved O2 concentration in the electrolyte on the cathode performance of a lithium-air battery was investigated. Using a beaker-type cell and nano/micro-bubble generator to dissolve O2, O2 concentration in the electrolyte was varied from 6.5 to 15.0 mg/L.
    As a result, discharge performance was improved by increasing the dissolved O2 concentration in the electrolyte. However, concentration overpotential still dominates the discharge at high current density. By using a fine optical oxygen sensor, O2 concentration in the porous cathode was measured. It was found that O2 concentration in the cathode reached considerably low value. In order to improve the performance, an electrolyte flow cell was employed, and the concentration overpotential (transport resistance) was lowered.

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  • Integrative Understanding of Mass Transport Phenomena in a PEMFC by Laser Ablation Tagging Visualization and Oxygen Absorption Spectroscopy

    Grant number:22246024  2010.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    HIRAI Shuichiro, TSUSHIMA Shohji, UEMURA Suguru, NISHIDA Kosuke

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    Grant amount:\47450000 ( Direct Cost: \36500000 、 Indirect Cost:\10950000 )

    We developed a visualization system of gas flow behavior called laser ablation tagging visualization (LATV), which showed a strong potential to examine flow behaviors in gas flow channel in an operating proton exchange membrane fuel cells (PEMFC). LATV system was constructed with two pulsed lasers: one is for laser ablation tagging and the other is for excitation of the tag material for visualization. The system was validated and was also applied to an operating PEMFC. Flow velocity in gas channel at operating conditions was examined with variation of current density. The results obtained by LATV shows deceleration of the cathode gas flow velocity. It suggests that the liquid water condensed in the downstream of the channel. Combined measurement with flow velocity and oxygen concentration along the cathode channel is also demonstrated to obtain variation of local current in the cell. It revealed that intensive reaction was established in the upstream region of the cell.

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  • Elucidation of mass transport and material degradation mechanisms in PEFC by advanced diagnostics using magnetic resonance imaging and laser techniques

    Grant number:18206023  2006 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    HIRAI Shuichiro, TSUSHIMA Syoji, SUEKANE Tetsuya, UEMURA Suguru

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    Grant amount:\48880000 ( Direct Cost: \37600000 、 Indirect Cost:\11280000 )

    In this project, elucidation of mass transport and material degradation mechanisms in polymer electrolyte fuel cells (PEFCs) by advanced diagnostics using magnetic resonance imaging (MRI) and laser techniques were performed. We developed an nuclear-labeing MRI technique to investigate water transport with and without micro porous layer in PEFCs. We also developed a visualization system of gas flow behavior in PEFC by optical absorption of Ozone. The system applied ultra violet light absorption that is characteristic of Ozone to unseeded velocity measurement and captured the shift of light absorption point. A penetration flow through porous gas diffusion layer was experimentally identified in an operating PEFC.

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  • R&D on stabilized CO2 geological storage free from leak risk

    Grant number:18510069  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    SUEKANE Tetsuya, HIRAI Shuichiro, TSUSHIMA Shoji

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    Grant amount:\4060000 ( Direct Cost: \3700000 、 Indirect Cost:\360000 )

    A CO_2 geological storage technology based on residual gas and solubility trapping is proposed. First, we experimentally evaluated the maximum trapped CO_2 saturation for typical conditions of aquifers at depths from 750 to 1,000m. To avoid the experimental difficulty due to the dissolution of CO_2 in water and the compressibility of CO_2, the trapped gas saturations were estimated from the relationship between pressure and volume under an isothermal expansion process. The trapped gas saturation is in the range from 24.8 to 28.2% despite the variation of CO_2 density, viscosity and interfacial tension. Therefore, at least 38.8% of CO_2 would be stored by residual gas and solubility trapping per unit volume as compared to physical trapping with cap rock. The storage potential of Japan by the proposed scheme is evaluated to be 71.6 Gt CO_2, which corresponds to the emission in Japan for 53.6 years. The storage by residual gas and solubility trapping not only augments the storage capacity but also provides the sites that are located close to the large emission sources.

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  • Transport phenomena of proton and water in PEFC by MRI and its application to high stability and performance

    Grant number:16360103  2004 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIRAI Shuichiro, SUEKANE Tetsuya, TSUSHIMA Shoji

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    Grant amount:\15100000 ( Direct Cost: \15100000 )

    Polymer electrolyte fuel cells (PEFCs) are promising power sources for vehicle applications and on-site power generation. One of the most important materials under development for PEFC stacks is a polymer electrolyte membrane (PEM), which conducts protons the anode to the cathode side, and it is well known that its proton conductivity depends on its water content. It implies that water in a PEM strongly relate to proton conducting mechanism. Here, we demonstrate the ^1H and ^2D atom replace in the electrolyte membrane by supplying hydrogen (H_2) or deuterium (D_2) as the fuel for the PEFC operation. By supplying deuterium as the fuel, D^+ comes into the electrolyte membrane by oxidation reaction, and replace with protons that are counter ion of sulfonic acid group and/or hydrogen atoms of water molecule. We measure the H atom distribution change after switching hydrogen to heavy hydrogen supply by the magnetic resonance imaging (MRI). The MR images clearly show that the replacement of the H and D atoms takes place in the anode side (fuel supply side), and D atoms replace almost all H atoms in the electrolyte membrane. This suggests the proton conducting mechanism in the polymer electrolyte membrane is 'bulk mechanism', which protons transport by Grotthuss mechanism in the water of hydrophilic region of the membrane^<7,8>, rather than 'surface mechanism' or 'vehicular mechanism'.
    Water vapor distribution is a cathode channel of polymer electrolyte fuel cell (PEFC) composed of gas supply channel and porous gas diffusion layer is calculated by lattice Boltzmann method (LBM) in order to clarify effect of porous structure of GDL in PEFC on water distribution and dew point of supplied gas. It is shown that porosity of GDL affects maximum water concentration emerged in the GDL, resulting in increase of dew point with decrease of porosity. On the other hand, pore scale in the GDL is less influential on water concentration distribution and its sesultant dew point of the supplied gas in the cathode of PEFC.

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  • Convection and Diffusion of Supercritical Carbon Dioxide in High-Pressure Porous Media Filled with Water

    Grant number:13450081  2001 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIRAI Shuichiro, TSUSHIMA Shoji, SUEKANE Tetsuya

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    Grant amount:\14000000 ( Direct Cost: \14000000 )

    This paper describes experimental and numerical research on two-phase flow of supercritical CO_2 and water in porous media under sequestration conditions. We used a magnetic resonance imaging technique to directly visualize the distribution of supereritical CO_2 injected into porous media containing water. in situ water saturation distributions in a Berea sandstone core and a packed bed of glass beads were successfully visualized under conditions that simulate those at 700 -1000-m depths in an aquifers at the depth in the range from 700m to 1000m. By applying the coreflood interpretation method to our saturation data, we could describe the local Darcy phase velocities as a function of saturation. Finally, the effect of buoyancy on displacement process and gravity dominated pure counter-current flow is discussed by comparing the data obtained at two conditions that model the aquifers at depths of 1000 m and 700 m. We found that buoyancy largely controls the pure counter-current flow in well permeable porous media for conditions at 700 and 1000-m depths. We had developed a numerical code, which simulates two-phase flow of supercritical C0_2 and water in porous media including the effect of interfacial tension, wettability, buoyancy, and viscosity ratio, by a lattice Boltzmann method. A present study shows that the wettability and interfacial tension affect the relative permeability to deviate from Darcy law at low body forces such as buoyancy. Therefore, the effect of wettability and interfacial tension on the relative permeability should be taken into account to estimate the long-term fate of sequestered C0_2 by large-scalp reservoir simulations. The relative permeability of C0_2 decreases with an increase of the capillary pressure of water, As a result, the capillary pressure could make the flow of C0_2 slower than that has estimated in former simulations. Since the effect of the capillary pressure is significant in cap-rocks, the deviation from Darcy law is vital to the leakage of C0_2 through the cap-rocks.

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  • Advance CO_2 Ocean Disposal for Long-term Sequestration and Reduced Biological Impact

    Grant number:12555055  2000 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIRAI Shuichiro, SUEKANE Tetsuya, OKAZAKI Ken, OSUMI Takashi, TSUSHIMA Shoji

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    Grant amount:\6600000 ( Direct Cost: \6600000 )

    Among various CO_2 ocean sequestration technologies, measures to restrict the increase of atmospheric CO_2 concentration, releasing CO_2 droplets from towed pipe of ship reduces biological impact by the dilution of dissolved CO_2 due to the motion of moving ship. CO_2 droplets, released around 1500m ocean depth, rise upward due to buoyancy and dissolved CO_2 at the sea depth of 500-1500m is considered to outgas to the atmosphere in 20-100 years. Here, we present a new concept of CO_2 sequestration in the ocean that CO_2 would dissolve at the sea depth deeper than the release point (I.e., 1500m) and biological impact would be minimized. Before releasing CO_2 droplets from the tip of towed pipe of moving ship, hydrate line particles are formed by injecting water small droplets inside CO_2 droplets. Since density of hydrate is 1.1g/cm3, CO_2 droplets including hydrate line particles more than 40vol% sink downward from release point into deep ocean that result in longer term sequestration. In addition, since depth of ocean is 4000m on an average, long travel distance for CO_2 droplets dissolution enables diluted CO_2 dissolution、 pH profiles in most of the part of sea depth would be larger than 7.0, Where biological impact would be minimized. The present concept is verified by an experiment.

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  • Fundamental study of ultra clean, high efficiency combustion system with integrated mass and Heat recirculations

    Grant number:11305019  1999 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    OKAZAKI Ken, FUSHINOBU Kazuyoshi, HIRAI Shuichiro

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    Grant amount:\32530000 ( Direct Cost: \30700000 、 Indirect Cost:\1830000 )

    The investigators has proposed and studied a ultra clean (CO2, NOx, SOx free), high efficiency combustion and gasification system that uses low quality fuels such as coal or biomass. By integrating the mass and heat recirculation, a new concept of combustion and gasification system has been proposed. The drastic reduction mechanisms of NOx and SOx emission are investigated both experimentally and theoretically. An unexpectedly high temperature field with heat recirculation and a totally new reaction field with mass recirculation, the amount of CO2 is so large that it can be easily liquefied, the NOx concentration is decreased due to the reduction reaction, and the SOx concentration is decreased due to the decreased decomposition of desulfurizer. Also, the gasification process has been investigated. Due to the high temperature field realized with the heat recirculation, the hidrogen-rich gasification is shown to be possible , which is one of the most promising utilization technology of biomass for future hydrogen -based energy systems.

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  • Elucidation of Mass Transport and Film Structure by MRI and LBM

    Grant number:11650209  1999 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HIRAI Shuichiro, TSUSHIMA Shouji, SUEKANE Tetsuya, OKAZAKI Ken

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    Grant amount:\3700000 ( Direct Cost: \3700000 )

    CO2 Hydrate Film is formed at the interface between liquid CO_2 and water, which is observed in ocean sequestration. It possesses a porus structure that water and CO_2 molecules are transported through the film to keep the thickness constant. The present research has been made for the followings.
    (1) MRI Measurement of hydrate growth has been made. The growth rate of hydrate film thickness has been measured by an specially designed high-pressure apparatus. Application to advanced CO_2 sequestration technology has also been proposed.
    (2) Measurement of CO_2 hydrate film thickness based on mass transport mechanism has been made by an high pressure apparatus. It was estimated to be 0.0004mm.
    (3) Massive CO_2 clathrate hydrate growth at a High-Polar-Energy Surface has been clarified and also, lateral growth rates of CO_2 clathrate-hydrate Film has been measured.
    (4) A New Boundary Condition of Lattice Boltzmann Method has been developed for the calculation of complex flow in porus media.

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  • 磁気共鳴3次元画像計測と分子動力学によるCO2水和物の構造・物質移動機構の解明

    Grant number:09750220  1997 - 1998

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    平井 秀一郎

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    Grant amount:\2800000 ( Direct Cost: \2800000 )

    大気中のCO2濃度の増加を抑制するために分離回収した液体CO2を深海底に貯留し隔離しようとする方策は,深海底の超高圧力条件下でCO2ハイドレートと呼ばれる固体水和物が液体CO2と海水の界面に形成され,CO2が海洋中に溶解することを抑制し,海洋環境に与える影響を大きく低減する効果を有していると考えられている.しかし,液体CO2と海水の界面に存在する固体水和物を通してCO2が海水へ溶解拡散する物質移動機構については不明で,特にこのことを固体水和物の構造との関連において明らかにすることが基礎的にも,またCO2を安定に隔離し,貯留する制御指針を得るためにも重要であると考えられる.CO2ハイドレートは,サッカーボール状のケージが集合することによって超微粒子群を形成しており,その超微粒子群のすき間をフリーな水分子ならびにCO2分子が運動していることがCO2ハイドレート内での物質移動の担い手になっていると考えられる.本研究では温度を高度に制御された恒温室内で,耐圧特殊アクリル内に耐圧ガラスを密着させたペンシル型の超高圧MRI用試料管に,液体CO2とイオン交換した水を2つの液の間に界面が形成されるように注入した.界面でCO2ハイドレートを成長させ,CO2ハイドレート中の水分子を構成している水素原子核は,超伝導傾斜磁場内で水素原子核の固有回転振動数と同じ振動数をもつ電磁波の照射により共鳴励起され,これにより生じる誘導電流を検出することにより,2次元空間内における水分子濃度を画像計測を行い、CO2ハイドレートの成長速度を明らかにした。これにより、CO2ハイドレートの中の成長機構について考察をくわえることが可能となり、そのモデリングならびに透過係数を算出した。

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  • Mechanisms of Ultra-low NOx and High Efficiency De-SOx in CO_2 Recycled Coal Combustion

    Grant number:09450089  1997 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    OKAZAKI Ken, OGAWA Kuniyasu, HIRAI Shuichiro

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    Grant amount:\9900000 ( Direct Cost: \9900000 )

    CO_2 recycled coal combustion is promising because of its easy CO_2 recovery, extremely low NOx emission and high in-furnace desulfurization efficiency. The feasibility of simultaneous CO_2/NOx/SOx reduction in CO_2 recycled coal combustion was studied in order to develop a novel environmentally favorable coal combustion technology.
    It was identified through experiments that the amount of NOx exhausted from the system is reduced to less than about one fourth of that exhausted with conventional air combustion. The contributions to the total NO decrease from coal combustion with air caused by the use of recycled CO_2 are as follows : 1. The effect of an increase of CO_2 concentration in the furnace is not significant below 10%. 2. The effect of interaction between fuel-N and recycled NO is 10-50 %. 3. The effect of a reduction of recycled NO in the furnace is dominant and amounts to 50-80%. Theoretical simulation also confirmed the validity of this result. The characteristics and mechanism of desulfurization were clarified through experiment and modeling. The desulfurization efficiency in CO_2 recycled coal combustion is about three times as high as that with coal combustion in air and does not suffer so much from CaSO_4 decomposition. The high desulfurization efficiency is mainly attributed to : 1. high concentration of SO_2 inside furnace owing to the recirculation of gases ; 2. decrease in CaSO_4 decomposition resulted from high SO_2 concentration. CO_2 recycled coal combustion was identified to be a promising system with which simultaneous reduction of CO_2/NOx/SOx can be realized.

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  • 核磁気共鳴と分子動力学計算による超高圧下固体水和物中でのCO_2物質移動現象の解明

    Grant number:08750226  1996

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    平井 秀一郎

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    Grant amount:\1000000 ( Direct Cost: \1000000 )

    大気中のCO_2濃度の増加を抑制するために火力発電所等の大量発生源から分離回収した液体CO_2を深海底に貯留する方策は,深海底の超高圧力条件下でCO_2クラスレートハイドレート(CO_2包接水和物)と呼ばれる固体水和物が液体CO_2と海水の界面に形成され,CO_2が海洋中に拡散することに対して抑制する効果を有すると考えられているため,有望なものと考えられている.しかし,液体CO_2と海水の界面に存在する固体水和物を通してCO_2が海水へ溶解拡散する物質移動機構については不明で,特にこのことを固体水和物の生成過程とその特異な構造の関連を明らかにすることが基礎的に重要であると考えられる.本研究は,水分子とCO_2分子を構成する原子間にポテンシャルを与えるCO_2クラスレートハイドレート形成過程の分子動力学シミュレーションを行った.初期条件として,まず,368個の水分子をランダムに配置した場を形成し、これにCO_2クラスレートの大ケージの中心位置にCO_2分子を配置した.その後,分子動力学シミュレーションを行い,水分子が水素結合を行い,これによりケージが構成され,CO_2クラスレートが形成されていく過程をコンピュータシミュレーションにより再現することができた.また,このシミュレーションにより得られるデータベースを用いて,CO_2クラスレートがなぜ形成されるのかを考察を行い,CO_2分子間に形成される狭いポテンシャル領域が,水分子の運動を2次元の範囲に限定し,これにより5員環,6員環が,最終的にはCO_2クラスレートのネットワークが形成されることを分子論的な視点から明らかにした.

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  • Development of Measuring CO_2 Concentration by Laser Induced Multiphoton Fluorescence

    Grant number:07558069  1995 - 1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    OKAZAKI Ken, SUZUKI Yuji, ITO Teruyuki, HIRAI Shuichiro

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    Grant amount:\7200000 ( Direct Cost: \7200000 )

    In order to develop strateges for global warming, it is needed to develop non-intrusive measurement technique of CO_2 concentration. It can be applied, for example, direct injection engine system which reduces CO_2 for 30 percent. In the present study, we developed a measurement technique using multiphoton absorption type laser induced fluorescence. A high-power pulse YAG laser light of 355nm (3.5eV) was focussed into a cell, where prescribed CO_2 concentration gas with Nitrogen flows through it. The laser induced fluorescence spectrum intensity was detected by an monocromator and CCD diode camera equipped with an image-intensifier. CO2 molecules was excited into a higher level of C,CO,CO_+ and CO_<2+> and characteristic laser induced fluorescence spectrum was detected. The mechanism of LIF was made clear. Effect of CO_2 concentration on the laser induced fluorescence intensity was clarified. In addition, laser intensity and pressure on the present measurement technique was elucidated. The present technique requires laser pulse enery larger than 200mJ/pulse. The pressure condition needs not to be low and the presetn method could be applied in atmospheric pressure condition. The nitrogen is also breaks into N_+ by the high power laser and the magnitude of its spectrum reduces when concentration of nitrogen becomes low. Its phenomena could be applied to an advanced measurement technique without considering laser power fluctutation and sensitivity of CCD diode array since the ratio of N_+ to CO_<2+> becomes only a function of CO_2 concentration.

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  • Thermoelectric Phenomana in High-Temperature and High-Pressure Electrostatic Precipitator and Performance Improvement

    Grant number:07455092  1995 - 1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    OKAZAKI Ken, HIRAI Shuichiro

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    Grant amount:\7700000 ( Direct Cost: \7700000 )

    Efficient removal of fly ash particles from high temperature flue gas is one of the most important technologies to be developed for realizing advanced high efficiency coal utilization systems such as an integrated coal gasification combined cycle (IGCC), and ceramics filtering systems have been considered for this purpose. On the other hand, high-temperature electrostatic precipitator systems also have a high possibility to be used for gas clean-up in IGCC.But in this case, high-pressure condition should be required to maintain corona discharge. The purpose of this study is to clarify separated effects of temperature and pressure on various electric and thermal phenomena in the high-temperature and high-pressure electrostatic precipitator and to obtain fundamental knowledges necessary to develop a highly efficient high-temperature and high-pressure electrostatic precipitator. For this purpose, one-dimensional cylindrical electrostatic precipitator with a thin wire electrode at the centerline has been constructed and effects of temperature and pressure on various electric and thermal phenomena have been derived separately and then coupled effect of them on precipitation performances have been clarified.
    Drastic decrease of collection efficiency at high temperature can be qualitatively explained by decrease of ion formation rate near the center electrode, decrease of particle charging rate and decrease of particle drift velocity with high kinematic viscosity and this result can be well explained by the dependency of mean free path on the temperature. The discharge mode should have changed from corona to glow mode. So, applying high pressure is definitely necessary to maintain high performance and low energy consumption in a high-temperature electrostatic precipitator.

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  • 深海相当超高圧下におけるクラスレート水和物を界面に伴う液体CO2の動的挙動の解明

    Grant number:07750224  1995

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    平井 秀一郎

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    Grant amount:\1100000 ( Direct Cost: \1100000 )

    地球温暖化の主要な原因の1つである大気中のCO2濃度の増加を抑制するために,火力発電所や製鉄所の大量発生源から分離回収した液体CO2を深海底に貯留する方法は,3000m以深の深海底では液体CO2は海水より密度が大きくなるため深海底の凹地を利用して液体CO2を貯留することが可能になることと,深海底の温度・圧力条件下で液体CO2と海水の反応によりCO2クラスレート水和物(以下,CO2クラスレート)と呼ばれる固体が界面に形成され,CO2の海洋への拡散の抑制に寄与するため,CO2による地球温暖化対策の有望なものの1つとして考えられている.
    本研究は,レーザ応用画像計測法を深海相当超高圧下をシミュレートするためにプローブ等の挿入が困難な超高圧下のCO2の実験に適用した.CO2のプールからの深層流による拡散挙動について,CO2クラスレートの溶解に伴うpHの変化をレーザシート内の2次元の誘起蛍光強度分布を受光することにより明らかにし,CO2クラスレートの物理化学挙動を含めたCO2の動的挙動を解明を行った。
    液体CO2または水にDye(色素)を混入し,Yagレーザ光の吸収により放射されるレーザ誘起蛍光の瞬時2次元分布を高感度CCDカメラにより受光した.CO2の拡散は,周囲の水に対してpHの変化を誘起し,Dye(色素)としてフルオレセインを用いると,2次元瞬時のpH分布の計測を行った。
    これにより、CO2の溶解速度を算出し、液体CO2噴出により得られた液体CO2のプールの上を深層流が流れ,これによりCO2が液体CO2を深海底に貯留することがどの程度のタイムスケールで行えるかを明らかにした。1GWの火力発電所から排出されるCO2の10年分が完全に溶解するまで240年程度要することを明らかにした

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  • レーザ平面蛍光法と直接シミュレーションによる密度変動を伴う旋回乱流輸送現象の解明

    Grant number:06750196  1994

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    平井 秀一郎

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    Grant amount:\900000 ( Direct Cost: \900000 )

    速度の異なる2流体がしきり板を介して混合する混合層について,数値粘性を加えない4次精度の中心差分を用いた直接シミュレーションを行い,以下の結論を得た.
    (1)速度比が0.7の場合について得られるシミュレーション結果より,混合層の初期生成領域では,運動量ならびにスカラー量の輸送が抑制される.特に,運動量の場合は抑制効果が大きく,逆勾配拡散現象が観測される.これらの特異な輸送現象が生じる原因について,運動量ならびにスカラー量の輸送を表わすu′v′ならびにv′c′の輸送方程式の各項の大きさと渦運動の相互作用について考察した.その結果,混合層初期生成領域においては,渦間の間隔が狭く,渦相互の干渉する効果により,渦の間に2次流れが生成され,主流と直角方向の速度変動が大きなものになること,その効果により,勾配拡散を駆動する生成項の大きさより,逆勾配拡散を駆動する速度圧力勾配相関項の大きさが卓越し,これにより運動量ならびにスカラー量の輸送が抑制されていることが明らかになった.
    (2)混合層の下流領域では,渦の合体が観測される.混合層の発達には,渦の合体が大きな役目を果たしていることが従来より指摘されているが,渦の合体時にどのような運動量輸送が行われるか明確ではなかった.直接シミュレーションから得られるデータベースを用いて,その現象について考察を行った.その結果,渦の合体時には,瞬時の速度変動のu′v′の負の領域,すなわち勾配拡散を駆動する領域が合体し,大きな負の領域が形成され,これにより運動量の勾配拡散が駆動されること,また,その後,u′v′の正の領域が生成され,逆勾配拡散が生じることが明らかになった.
    さらにスカラー量の輸送についても考察を行い,スカラー量の輸送をあらわすu′c′は,渦合体挙動の初期には勾配拡散が駆動され,さらに合体が進むと逆勾配拡散が駆動される特徴的な輸送機構が生じていることが明確になった.

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  • レーザ応用計測と直接シミュレーションによる密度変動を伴う旋回乱流輸送現象の解明

    Grant number:05750193  1993

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    平井 秀一郎

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    Grant amount:\900000 ( Direct Cost: \900000 )

    速度の異なる2流体がしきり板を介して混合する混合層について,数値粘性を加えない4次精度の中心差分を用いた直接シミュレーションを行い,以下の結論を得た.
    (1)速度比が0.7の場合について得られるシミュレーション結果より,混合層の初期生成領域では,運動量ならびにスカラー量の輸送が抑制される.特に,運動量の場合は抑制効果が大きく,逆勾配拡散現象が観測される.これらの特異な輸送現象が生じる原因について,運動量ならびにスカラー量の輸送を表わすu′v′ならびにv′c′の輸送方程式の各項の大きさと渦運動の相互作用について考察した.その結果,混合層初期生成領域においては,渦間の間隔が狭く,渦相互の干渉する効果により,渦の間に2次流れが生成され,主流と直角方向の速度変動が大きなものになること,この効果により,勾配拡散を駆動する生成項の大きさより,逆勾配拡散を駆動する速度圧力勾配相関項の大きさが卓越し,これにより運動量ならびにスカラー量の輸送が抑制されていることが明らかになった.
    (2)混合層の下流領域では,渦の合体が観測される.混合層の発達には,渦の合体が大きな役目を果たしていることが従来より指摘されているが,渦の合体時にどのような運動量輸送が行われるか明確ではなかった.直接シミュレーションから得られるデータベースを用いて,その現象について考察を行った.その結果,渦の合体時には,瞬時の速度変動のu′v′の負の領域,すなわち勾配拡散を駆動する領域が合体し,大きな負の領域が形成され,これにより運動量の勾配拡散が駆動されること,また,その後,u′v′の正の領域が生成され,逆勾配拡散が生じることが明らかになった.

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  • Development of Detection of Molecular Velocity and Pressure by Laser Induced Fluorescence

    Grant number:62850039  1987 - 1988

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Developmental Scientific Research

    TAKAGI Toshimi, KOMIYAMA Masaharu, HIRAI Shuichiro, OKAMOTO Tatuyuki

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    Grant amount:\7700000 ( Direct Cost: \7700000 )

    Detection of velocity and pressure by non-intrusive method using induced fluorescence were investigated.
    Velocity of gaseous molecules was detected using the relation between the fluorescence intensity and the velocity.
    Fluorescence intensity is related by the ralative position between the absorption line shape of the molecules and the incident laser light wave length. When the molecules are moving, the relative position of the absorption line and the incident laser light wave length is changed due to the Doppler effect.
    Numerical simulation of the relation between fluorescence intensity and velocity, and the experimental verification were conducted to investigate the validity of the measureing method.
    Pressure detection was conducted by use of the fluorescence from iodine molecules excited by the UV light source(near 190nm). The relation between fluorescence intensity and pressure was correlated experimentally and the validity of the measureing method was investigated. The mechanism of the pressure dependence of the fluorescence intensity was discussed.

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