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首页> 外文会议>International Conference on Fuel Cell Science, Engineering and Technology; 20040614-20040616; Rochester,NY; US >NUMERICAL ANALYSIS OF WATER TRANSPORT IN PEM FUEL CELL MEMBRANES USING A PHENOMENOLOGICAL MODEL
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NUMERICAL ANALYSIS OF WATER TRANSPORT IN PEM FUEL CELL MEMBRANES USING A PHENOMENOLOGICAL MODEL

机译：基于PEM燃料电池膜水分迁移的现象学数值分析。

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摘要

A numerical investigation on the water transport across the membrane of a proton exchange membrane fuel cell is carried out to gain insight into water management issues, which are crucial to the efficient operation of such fuel cells. The transport equation of water content based on a phenomenological model, which includes an electro-osmotic drag term and a diffusion term, is solved using the finite volume method for a 1-D configuration with the assumption of a uniform temperature distribution. Transport properties including the drag coefficient and diffusion coefficient of water in the membrane and the ionic conductivity of the membrane are expressed as functions of water content and temperature. The effects on the water flux across the membrane and on overall membrane protonic conductivity due to variations of these properties are studied. The numerical results show that water transport in the membrane is mainly determined by the relative strength of electro-osmotic drag and diffusion, which are affected by operating conditions such as current density and relative humidity at the membrane surface, and design parameters such as membrane thickness and membrane material. Computed water fluxes for different humidity boundary conditions indicate that for a thick membrane, e.g. Nafion 117, electro-osmotic drag dominates transport over a wide range of operating conditions, whereas for a thin membrane, e.g. Nafion 112, diffusion of water becomes equally important under certain conditions. Implications of the one-dimensional investigation on comprehensive CFD based modelling of proton exchange membrane fuel cell are also discussed.
机译：对跨质子交换膜燃料电池的水传输进行了数值研究，以深入了解水管理问题，这些问题对于此类燃料电池的有效运行至关重要。基于一维模型，在有限温度分布的前提下，使用有限体积法求解基于一维模型的含水量输运方程，其中包括电渗阻力项和扩散项。包括膜中水的阻力系数和扩散系数以及膜的离子电导率在内的传输特性表示为水含量和温度的函数。研究了由于这些性质的变化而对穿过膜的水通量和对整个膜的质子传导率的影响。数值结果表明，水在膜中的传输主要取决于电渗阻力和扩散的相对强度，而电渗阻力和扩散的相对强度受工作条件（例如膜表面的电流密度和相对湿度）以及设计参数（例如膜厚度）的影响和膜材料。对于不同的湿度边界条件，计算出的水通量表明，对于厚膜，例如Nafion 117电渗透阻力在广泛的操作条件下占据着主导地位，而对于薄膜，例如Nafion 112，水的扩散在某些条件下同样重要。还讨论了一维研究对基于质子交换膜燃料电池的全面CFD建模的意义。

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