Two‐dimensional model for proton exchange membrane fuel cells
Two‐dimensional model for proton exchange membrane fuel cells
复制标题
DOI：
10.1002/aic.690441109
复制
发表时间：
1998-11
期刊：
影响因子：
3.7
通讯作者：
V. Gurau;Hongtan Liu;S. Kakaç
中科院分区：
文献类型：
--
作者：
V. Gurau;Hongtan Liu;S. Kakaç
建立了包括气体通道在内的质子交换膜燃料电池整个夹层结构的二维数学模型。多孔介质的自洽模型用于描述膜，催化剂层和气体扩散器中的传输现象的方程，而Navier-Stokes，能量传输，连续性和物种浓度的标准方程在气体通道中求解。一个特殊的处理的传输方程，使我们能够使用相同的数值方法在统一的域组成的气体通道，气体扩散器，催化剂层和膜。它还消除了在燃料电池夹层的不同部分之间的界面处规定任意或近似边界条件的需要。通过求解输运方程、电化学反应方程和电流密度与膜相电位的关系式，得到了不同操作条件下的极化曲线。建模结果与文献中的实验结果进行了比较。研究了在不同工作电流密度下，阴极气体通道-气体扩散器耦合结构中氧气和水蒸气摩尔分数的分布。得到了液水在膜内的速度分布以及各参数对电池性能的影响。
A 2-D mathematical model for the entire sandwich of a proton-exchange membrane fuel cell including the gas channels was developed. The self-consistent model for porous media was used for the equations describing transport phenomena in the membrane, catalyst layers, and gas diffusers, while standard equations of Navier-Stokes, energy transport, continuity, and species concentrations are solved in the gas channels. A special handling of the transport equations enabled us to use the same numerical method in the unified domain consisting of the gas channels, gas diffusers, catalyst layers and membrane. It also eliminated the need to prescribe arbitrary or approximate boundary conditions at the interfaces between different parts of the fuel cell sandwich. By solving transport equations, as well as the equations for electrochemical reactions and current density with the membrane phase potential, polarization curves under various operating conditions were obtained. Modeling results compare very well with experimental results from the literature. Oxygen and water vapor mole fraction distributions in the coupled cathode gas channel-gas diffuser were studied for various operating current densities. Liquid water velocity distributions in the membrane and influences of various parameters on the cell performance were also obtained.