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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >A TWO-PHASE AND MULTI-COMPONENT MODEL FOR THE CATHODE OF PEM FUEL CELLS
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A TWO-PHASE AND MULTI-COMPONENT MODEL FOR THE CATHODE OF PEM FUEL CELLS

机译：PEM燃料电池阴极的两相多组分模型

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摘要

A two-dimensional, two-phase and multi-component flow and transport model has been developed to simulate the flow and transport phenomena in the cathodes of PEM fuel cells. First, the governing equations based on a "two-phase mixture model" are derived by using a unified approach that describes the flow and transport in the gas channel and gas diffuser simultaneously. Then, the detailed boundary conditions are discussed especially at the gas diffuser/catalyst layer interface, which couples the flow, transport, potential and current density in the anode, the catalyst layer and membrane. Next, th model is validated by comparing the modeling results with experimental data. Further, typical distributions of oxygen and water-mass fraction in the "two-phase mixture," as well as water vapor mass fraction, liquid saturation and liquid velocity vector are presented. Finally, the model is used to study the influences of two of the most critical issues of PEM fuel cell operation: i.e., the water and the thermal management on the two-phase flow. It was found that the two-phase flow characteristics in the cathode depend on some of the following factors: current density, operating temperature, and cathode and anode humidification temperatures. The dependence of the formation and the distribtition of the two-phase flow in the gas diffuser and gas channel on these factors is explored. By studying the effects of these parameters on the two-phase flow and the fuel cell perfomance, the model can be used to study a water and thermal management scheme.
机译：已经开发了二维，两相和多组分流动和传输模型，以模拟PEM燃料电池阴极中的流动和传输现象。首先，使用统一的方法导出基于“两相混合物模型”的控制方程，该方法同时描述了气体通道和气体扩散器中的流动和传输。然后，详细讨论了边界条件，尤其是在气体扩散器/催化剂层界面处，该边界条件耦合了阳极，催化剂层和膜中的流动，传输，电势和电流密度。接下来，通过将建模结果与实验数据进行比较来验证模型。此外，给出了“两相混合物”中氧气和水的质量分数的典型分布，以及水蒸气的质量分数，液体饱和度和液体速度矢量。最后，该模型用于研究PEM燃料电池运行的两个最关键问题的影响：即水和热管理对两相流的影响。发现阴极中的两相流动特性取决于以下一些因素：电流密度，工作温度以及阴极和阳极增湿温度。探讨了气体扩散器和气体通道中两相流的形成和分布与这些因素的关系。通过研究这些参数对两相流和燃料电池性能的影响，该模型可用于研究水和热管理方案。

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