SOFC电极多组分传质过程的格子Boltzmann模拟  

Lattice Boltzmann Modelling of Multi-Component Gas Transport in a SOFC Electrodes Layer

作　　者：徐晗[1,2] 党政[2] 白博峰[1] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]西安交通大学建筑环境与设备工程系,陕西西安710049

出　　处：《工程热物理学报》2013年第9期1711-1714,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50976092);教育部博士点基金(No.20090201120076);中央高校基本科研业务费专项资金资助2012

摘　　要：本文建立了基于气体混合物动力学理论的多组分流动与基于Brinkman方程的REV尺度多孔介质流动的耦合二维LB模型,研究了SOFC阳极与阴极内多组分气体传质过程,对SOFC浓差极化进行预测.计算结果表明:对含有惰性气体的三组分等摩尔反向扩散过程,本文计算的各组分摩尔分数分布与采用Stefan-Maxwell方程计算的结果吻合较好;对多组分气体在多孔电极内的传质过程,本文计算的浓差极化与采用Extended FM、DGM与SMM计算的结果相比更加接近实验结果。A two-dimensional coupled Lattice Boltzmann （LB） model composed of a multi-component model based on kinetic theory for gas mixtures and an algorithm based on the Brinkman equation for flows in porous media at representative elementary volume （REV） scale is established to study the gas transport in the porous anode and cathode of SOFC. The molar fraction distribution of each species simulated using the present model is consistent with that obtained by Stefan-Maxwell equation for the equi-molar counter-diffusion including three components with the inert gas. Moreover, the concentration overpotential of SOFC calculated by the LB model agrees much better with the experimental results compared with that predicted by the extended Fiek＇s Model （FM）, the Dusty Gas Model （DGM）, and the Stefan Maxwell Model （SMM）.

关 键 词：格子BOLTZMANN方法 多组分 多孔介质 质量传递 固体氧化物燃料电池 

分 类 号：TM911.47[电气工程—电力电子与电力传动]