期刊
JOURNAL OF POWER SOURCES
卷 186, 期 1, 页码 104-114出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.09.086
关键词
Lattice Boltzmann; Permeability; Gas diffusion layer; Anisotropic; Tortuosity
资金
- National Natural Science Foundation of China [50536010]
The multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) with multi-reflection solid boundary conditions is used to study anisotropic permeabilities of a carbon paper gas diffusion layer (GDL) in a fuel cell. The carbon paper is reconstructed using the stochastic method, in which various porosities and microstructures are achieved to simulate different samples. The simulated permeability and tortuosity show anisotropic characteristics of the reconstructed carbon papers with in-plane permeability higher than through-plane, and in-plane tortuosity lower than through-plane. The calculated permeabilities are in good agreement with existing measurements. The relationship between the permeability and the porosity is fitted with empirical relations and some fitting constants are determined. Furthermore, the obtained relationship of tortuosity and porosity is used in a fractal model for permeabilities. The results indicate that the fractal model and the Kozeny-Carman equation provide similar predictions on the through-plane permeability of the carbon paper GDL. (c) 2008 Published by Elsevier B.V.
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