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자료유형
학술대회자료
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한국자동차공학회 한국자동차공학회 춘 추계 학술대회 논문집 한국자동차공학회 2007년 춘계학술대회 논문집 Volume IV
발행연도
2007.6
수록면
2,296 - 2,301 (6page)

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For the efficient operation of PEM fuel cells, complex water management strategies are needed to make the dedicate balance between the operation of avoiding cathode flooding and membrane dehydration possible. Especially, the dynamic responses of PEM fuel cells are closely related to novel water management for mobile applications. Therefore, the research of water transport during transients of PEM fuel cells as well as under steady state condition is essential for automotive applications. To this end, the transparent unit fuel cell was designed and manufactured to visualize the liquid water transport related to cathode flooding in parallel serpentine flow channels during the transient conditions (such as changes in current density). Using CCD imaging system, the visualization experiment was performed to observe the water droplet dynamics (formation, growth and removal of water droplets). The transport characteristics of liquid water droplets on the interface between the gas flow channels and the top surface of gas diffusion layers (GDLs) were mainly investigated with different operating temperatures. Based on this study, we can obtain the basic insight into water transport and its related cathode flooding during transient conditions. It is expected that data obtained can be much helpful for the development of a comprehensive transient PEM fuel cell model that incorporates water transport and heat transfer in the cell during dynamically changing operating conditions.

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