Two-phase flow distributors for fuel cell flow channels |
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Authors: | Hsiaotao T. Bi, Pierre Sauriol,Jü rgen Stumper |
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Affiliation: | a Clean Energy Research Centre and Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada, V6T 1Z4;b Automotive Fuel Cell Corporation, Burnaby, BC, Canada, V5J 5J8 |
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Abstract: | All existing proton exchange membrane (PEM) fuel cell gas flow fields have been designed on the basis of single-phase gas flow distribution. The presence of liquid water in the flow causes non-uniform gas distribution, leading to poor cell performance. This paper demonstrates that a gas flow restrictor/distributor, as is commonly used in two-phase flow to stabilize multiphase transport lines and multiphase reactors, can improve the gas flow distribution by significantly reducing gas mal-distribution caused by either non-uniform water formation in parallel flow channels or flow instability associated with negative-slope pressure drop characteristic of two-phase horizontal flow systems. |
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Keywords: | Gas distributor Gas– liquid two-phase flow Fuel cell flow field Pressure drop hysteresis Flow mal-distribution |
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