Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 40, Issue 1, Pages 652-664Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.11.051
Keywords
PEMFC; Gas diffusion layer; Compression; Computational fluid dynamics; Permeability
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Funding
- Engineering and Physical Sciences Research Council
- Engineering and Physical Sciences Research Council [1269327] Funding Source: researchfish
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A two-dimensional study of an idealised fibrous medium representing the gas diffusion layer of a PEMFC is conducted using computational fluid dynamics. Beginning with an isotropic case the medium is compressed uni-directionally to observe the effects on single and multiphase flow. Relations between the compression ratio and the permeability of the medium are deduced and key parameters dictating the changes in flow are elucidated. The main conclusions are that whilst compression reduces the absolute permeability of an isotropic medium, the creation of anisotropic geometry results in preferential liquid water pathways. The most important parameter for capillary flow, in uniformly hydrophobic media, is the minimum fibre spacing normal to the flow path. The effect is less pronounced with decreasing contact angle and non-existent for neutrally wettable media. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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