建立了质子交换膜燃料电池(PEMFC)流道内气体扩散层(GDL)表面的微型凹槽模型,考虑到GDL表面微型凹槽处疏水涂层的脱落,将微型凹槽内的壁面当作亲水性壁面处理,运用FLUENT软件中的Volume of Fluid(VOF)模型模拟PEMFC处于工况下流道内液...建立了质子交换膜燃料电池(PEMFC)流道内气体扩散层(GDL)表面的微型凹槽模型,考虑到GDL表面微型凹槽处疏水涂层的脱落,将微型凹槽内的壁面当作亲水性壁面处理,运用FLUENT软件中的Volume of Fluid(VOF)模型模拟PEMFC处于工况下流道内液态水的传输现象,得出了在GDL表面的亲水性微型凹槽会阻碍流道内液态水的传输及排出的结论,并通过对比三组不同空气流速下流道内液态水的体积分数,分析了空气流速对流道内水传输的影响,对于正确认识PEMFC流道内的水传输现象和提高PEMFC的水管理性能具有重要意义。展开更多
<div style="text-align:justify;"> Proton exchange membrane fuel cell (PEMFC) reaction byproduct water is eventually discharged from the cathode channel through the surface of the diffusion layer (GDL)....<div style="text-align:justify;"> Proton exchange membrane fuel cell (PEMFC) reaction byproduct water is eventually discharged from the cathode channel through the surface of the diffusion layer (GDL). Although there are many studies on the kinetic behavior of liquid water in the cathode flow channel, there is still a lack of literature on water transport behavior in the flow channel considering the pore structure distribution on the GDL surface. In this paper, the effect of different size liquid water inlet arrangements on the GDL surface on the water management performance of the cathode runner is investigated. The volume of fluid (VOF) model is used to simulate the gas-liquid two-phase flow phenomenon in the channel. The results show that the droplet size discharged from the cathode flow channel is basically the uniformity when the liquid water inlet is distributed in gas flow from the largest to the smallest in size. At the same time, the maximum total liquid water content achievable in the flow channel, the maximum GDL surface coverage is the smallest, and the cathode flow channel has the best water management performance. The effect of pore structure distribution on the surface of GDL should be considered when conducting the study of water transport behavior in the cathode flow channel to reveal further the transport process of liquid water in the cathode channel and the removal mechanism. </div>展开更多
文摘建立了质子交换膜燃料电池(PEMFC)流道内气体扩散层(GDL)表面的微型凹槽模型,考虑到GDL表面微型凹槽处疏水涂层的脱落,将微型凹槽内的壁面当作亲水性壁面处理,运用FLUENT软件中的Volume of Fluid(VOF)模型模拟PEMFC处于工况下流道内液态水的传输现象,得出了在GDL表面的亲水性微型凹槽会阻碍流道内液态水的传输及排出的结论,并通过对比三组不同空气流速下流道内液态水的体积分数,分析了空气流速对流道内水传输的影响,对于正确认识PEMFC流道内的水传输现象和提高PEMFC的水管理性能具有重要意义。
文摘<div style="text-align:justify;"> Proton exchange membrane fuel cell (PEMFC) reaction byproduct water is eventually discharged from the cathode channel through the surface of the diffusion layer (GDL). Although there are many studies on the kinetic behavior of liquid water in the cathode flow channel, there is still a lack of literature on water transport behavior in the flow channel considering the pore structure distribution on the GDL surface. In this paper, the effect of different size liquid water inlet arrangements on the GDL surface on the water management performance of the cathode runner is investigated. The volume of fluid (VOF) model is used to simulate the gas-liquid two-phase flow phenomenon in the channel. The results show that the droplet size discharged from the cathode flow channel is basically the uniformity when the liquid water inlet is distributed in gas flow from the largest to the smallest in size. At the same time, the maximum total liquid water content achievable in the flow channel, the maximum GDL surface coverage is the smallest, and the cathode flow channel has the best water management performance. The effect of pore structure distribution on the surface of GDL should be considered when conducting the study of water transport behavior in the cathode flow channel to reveal further the transport process of liquid water in the cathode channel and the removal mechanism. </div>
