考虑多孔电极内气液分布的数学模型  

Mathematical Model of Gas and Liquid Distribution in the Porous Electrode

作　　者：徐献芝[1] 朱梅[1] 杨基明[1] 

机构地区：[1]中国科学技术大学力学和机械工程系,合肥230027

出　　处：《中国工程科学》2005年第8期36-40,共5页Strategic Study of CAE

基　　金：国家自然科学基金资助项目(10272100)

摘　　要：给出了多孔电极内不同气液分布形状的溶液欧姆定律;在单孔电极模型基础上定义了电化学反应的有效三相分界线长度概念,并给出了对应的计算方法;建立了基于多孔介质气液分布理论的一维电流和过电位数学模型,用数值迭代方法计算了沿电极面法线方向上的电流和过电位分布,分析了气体饱和度分布和有效三相分界线长度对它们的影响。The Ohm＇s Law in solution considering the gas and liquid distribution in porous electrodes is given. Based on the mathematical model of the single pore electrode, the effective three-phase boundary length of the electrochemical reaction is defined and calculated. One-dimensional current and overpotential mathematical model of the porous electrode process is also established by the gas and liquid distribution theory of the porous medium. Current and overpotential distributions along normal direction of the electrode are given by numerical iteration method. Influence of the gas saturation and effective three-phase boundary length to the current and overpotential distributions are discussed.

关 键 词：多孔介质 过电位 单孔电极模型 三相界面 数学模型 

分 类 号：O335[理学—一般力学与力学基础] TQ15[理学—力学]