Effect of a Cone Perforation Design in Gas Diffusion Layers of PEMFC on Water Transport Under a Wave-Like Flow Channel 2019-01-0380
Water management, particularly in the gas diffusion layers (GDL), plays an important role in the performance and reliability of PEMFC. In this study, a two-phase multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) is employed to simulate the characteristics of liquid water transport in reconstructed GDL with cone perforation under a wave-like channel. The revised pseudopotential multiphase model is adopted to realize high density ratio, thermodynamic consistency and surface tension adjustment. The cone shape properties including cone angle, cone height, and separation distance are varied in the analysis to reveal the influences of the cone perforation designs on the water removal in the GDL. And the material properties including contact angle and thickness of GDL are also considered. The LBM simulation provides detailed results in mesoscale and indicates that an optimized cone perforation design has significant advantages compared with the conventional design of GDL. It is found that the asymmetric perforation exhibits better water transport performance than the symmetric perforation. The water-removal performance increases first then decrease with increasing cone height. A positive correlation is found between the cone angle and the water-removal rate. But there is no direct relation between the cone shapes and the time when the water starts to move into the flow channel.
Jiapei Yang, Kai H. Luo, Xiao Ma, Yanfei Li, Shijin Shuai
Tsinghua Univ., Tsinghua Univ. and Univ. College London