Effect of porosity heterogeneity on the permeability and tortuosity of gas diffusion layers in polymer electrolyte membrane fuel cells

被引：72
作者：
Nabovati, Aydin [1 ]
Hinebaugh, James [2 ]
Bazylak, Aimy [2 ]
Amon, Cristina H. [1 ]
机构：
[1] Univ Toronto, Dept Mech & Ind Engn, Adv Thermal Fluids Optimizat Modelling & Simulat, Toronto, ON M5S 3G8, Canada
[2] Univ Toronto, Dept Mech & Ind Engn, Thermofluids Energy & Adv Mat TEAM Lab, Toronto, ON M5S 3G8, Canada
来源：
JOURNAL OF POWER SOURCES | 2014年 / 248卷
基金：
加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词：
Porosity heterogeneity; Binder & PTFE; Permeability; Tortuosity; Gas diffusion layer; Lattice Boltzmann method; EFFECTIVE THERMAL-CONDUCTIVITY; MASS-TRANSPORT; PEMFC GDLS; DISTRIBUTIONS; FLOW; SIMULATIONS; CONVECTION; RESISTANCE; INPLANE;
D O I：
10.1016/j.jpowsour.2013.09.061
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper, we study the effect of porosity heterogeneity on the bulk hydrodynamic properties (permeability and tortuosity) of simulated gas diffusion layers (GDLs). The porosity distributions of the heterogeneous reconstructed samples are similar to those previously reported in the literature for Toray TGP-H 120 (TM), GDLs. We use the lattice Boltzmann method to perform pore-level flow simulations in the reconstructed GDL samples. Using the results of pore-level simulations, the effect of porosity distribution is characterized on the predicted in- and cross-plane permeability and tortuosity. It was found that porosity heterogeneity causes a higher in-plane permeability and lower in-plane tortuosity, while the effect is opposite in the cross-plane direction, that is a lower cross-plane permeability and a higher crossplane tortuosity. We further investigate the effect of adding poly-tetra-fluoro-ethylene (PTFE) & binder material to the reconstructed GDL samples. Three fiber volume percentages of 50, 75, and 100% are considered. Overall, increasing the fiber volume percentage reduces the predicted in- and cross-plane permeability and tortuosity values. A previously reported relationship for permeability of fibrous materials is fitted to the predicted permeability values, and the magnitude of the fitting parameter is reported as a function of fiber volume percentage. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：83 / 90
页数：8
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