润湿性对质子交换膜燃料电池（PEMFC）气体扩散层中液态水传输的影响
Influence of wettability on liquid water transport in gas diffusion layer of proton exchange membrane fuel cells (PEMFC)
摘要：
水管理是限制PEFC性能的关键因素。我们展示了如何深入了解这个问题，可以从孔隙尺度的模拟模型纤维介质中的水入侵。我们探讨了接触角对水侵入模式和水饱和度的影响，并显示了一个戏剧性的变化，在入侵模式，从分形紧凑，发生系统从疏水性到亲水性的变化。然后，我们探讨的情况下，混合润湿性的系统，即包含亲水性和疏水性孔。突破时的饱和度作为亲水性孔隙分数的函数进行了研究。讨论了与水管理问题，GDL的优化设计和燃料电池性能退化机制的关系的结果。我们概述了如何研究可以扩展到3D系统，特别是从二进制图像的GDL获得的X射线显微断层扫描。
英文摘要：
Water management is a key factor that limits PEFC's performance. We show how insights into this problem can be gained from pore-scale simulations of water invasion in a model fibrous medium. We explore the influence of contact angle on the water invasion pattern and water saturation at breakthrough and show that a dramatic change in the invasion pattern, from fractal to compact, occurs as the system changes from hydrophobic to hydrophilic. Then, we explore the case of a system of mixed wettability, i.e. containing both hydrophilic and hydrophobic pores. The saturation at breakthrough is studied as a function of the fraction of hydrophilic pores. The results are discussed in relation with the water management problem, the optimal design of a GDL and the fuel cell performance degradation mechanisms. We outline how the study could be extended to 3D systems, notably from binarised images of GDLs obtained by X ray microtomography.
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