被动式直接甲醇燃料电池阳极混合对流模拟

Numerical Simulation of Mixed Convection in Anode of a Passive Direct Methanol Fuel Cell

本文根据被动式微小型直接甲醇燃料电池的运行特性,建立了其阳极膜电极二维、非等温、稳态数学模型。模拟结果表明:阳极膜电极内部温度的分布是不均匀的,最高温度出现在阳极催化层,且质子交换膜的温度要高于阳极气体扩散层。由于被动式直接甲醇燃料电池燃料的供给与消耗所引起的强制对流的存在,使得混合对流温度场和速度矢量场与自然对流情况下的不尽相同,利用模型对此进行了数值分析。

A two-dimensional,non-isothermal,steady-state modeling for anode and membrane of a passive direct methanol fuel cell is presented with consideration of its operation characteristics. Computational results show that the temperature distribution inside anode and membrane is not homogeneous.Highest temperature is in anodic catalyst layer.Temperature of membrane is higher than that of anodic gas diffusion layer.As a result of forced convection caused by fuel supply and consumption,temperature and velocity fields of mixed convection inside passive direct methanol fuel cell are different from that of natural convection.This difference is analyzed numerically using the model.