Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16350
Title: Effective diffusivity of gas diffusion layer in proton exchange membrane fuel cells
Authors: Shou, D
Fan, J
Ding, F 
Keywords: Analytical model
Effective diffusivity
Fibrous media
Gas diffusion layers
Proton exchange membrane fuel cell
Issue Date: 2013
Publisher: Elsevier
Source: Journal of power sources, 2013, v. 225, p. 179-186 How to cite?
Journal: Journal of power sources 
Abstract: In gas diffusion layers (GDLs) of proton exchange membrane fuel cells (PEMFCs), effective gas diffusivity is a key parameter to be determined and engineered. Existing theoretical models of effective diffusivity are limited to one-dimensional (1D) regular fiber arrays. Numerical simulations were carried out to simulate gas diffusion through more realistic fibrous materials like GDLs, in which fibers are randomly distributed in a two-dimensional (2D) plane or three-dimensional (3D) space, but they could not fully reveal the underlying mechanisms. In this paper, we propose an analytical model to predict the effective diffusivities of 1D, 2D and 3D randomly distributed fiber assembles. The present model is established by extending the model of 1D regular fiber alignments to 1D random fiber arrangements through Voronoi Tessellation method, and using the 1D local diffusivities to determine the 2D and 3D diffusivities based on mixing rules. The predicted effective diffusivities agree well with experimental results and numerical data. With the new model, the influences of porosity, fiber distribution, and fiber orientation are analyzed in this study.
URI: http://hdl.handle.net/10397/16350
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2012.10.039
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