【摘要】 采用格子Boltzmann方法(LBM)数值模拟研究了质子交换膜燃料电池(PEMFC)中气体通道(GC)表面润湿特性对气体扩散层(GDL)中液态水分布和含量的影响,从微观层次详细分析了液态水在GDL-肋板(land)交界面处的传输过程。研究结果表明,与亲水GC相比,疏水GC增加了GDL中的液态水含量。由于GDL中的液态水对电池性能的影响很大,在建立相关模型研究PEMFC中液态水分布时必须考虑GC表面润湿特性的影响。更多还原

【Abstract】 Lattice Boltzmann method(LBM)is used to investigate the effects of gas channel(GC)wall wettability on liquid water distribution and content in gas diffusion layer(GDL)of a proton exchange membrane fuel cell(PEMFC).The effects of GC wall wettability are explored by simulating liquid water transport process in GDL and GC.Simulating results reveal that GC wall wettability significantly affects liquid water amount in GDL.Compared with hydrophobic GC,a hydrophilic GC leads to less liquid water accumulated in the GDL.A better understanding of the results is obtained by analyzing the pore-scale dynamic behaviors of liquid water with special attention given to that at the GDL-GC interface.The simulation results suggest that in future study of liquid water transport and distribution in the PEMFC,effects of GC wall wettability on liquid water distribution within the GDL should be considered.更多还原