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首页> 外文期刊>Journal of power sources >Dynamic water transport and droplet emergence in PEMFC gas diffusion layers
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Dynamic water transport and droplet emergence in PEMFC gas diffusion layers

机译：PEMFC气体扩散层中的动态水传输和液滴出现

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摘要

The dynamics of liquid water transport through the gas diffusion layer (GDL) and into a gas flow channel are investigated with an ex situ experimental setup. Liquid water is injected through the bottom surface of the GDL, and the through-plane liquid pressure drop, droplet emergence and droplet detachment are studied. The dynamic behaviour of water transport in and on the surface of the GDL is observed through fluorescence microscopy, and the through-plane liquid pressure drop is measured with a pressure transducer. With an initially dry GDL, the initial breakthrough of liquid water in the GDL is preceded by a substantial growth of liquid water pressure. Post-breakthrough, droplets emerge with a high frequency, until a quasi-equilibrium liquid water pressure is achieved. The droplet emergence/detachment regime is followed by a transition into a slug formation regime. During the slug formation regime, droplets tend to pin near the breakthrough location, and the overall channel water content increases due to pinning and the formation of water slugs. Droplets emerge from the GDL at preferential breakthrough locations; however, these breakthrough locations change intermittently, suggesting a dynamic interconnection of water pathways within the GDL. The experiments are complemented by computational fluid dynamics (CFD) simulations using the volume of fluid method to illustrate the dynamic eruption mechanism.
机译：用异位实验装置研究了液态水通过气体扩散层（GDL）进入气体流动通道的动力学。通过GDL的底面注入液态水，并研究了整个平面上的液体压降，液滴出现和液滴分离。通过荧光显微镜观察水在GDL内部和表面的动态行为，并通过压力传感器测量整个平面的液体压降。对于最初干燥的GDL，液态水在GDL中的最初突破之前是液态水压力的大幅增长。突破后，液滴以高频率出现，直到达到准平衡液态水压力。液滴出现/脱离状态之后是过渡到团状形成状态。在团状形成过程中，液滴倾向于在穿透位置附近钉扎，并且由于钉扎和水团的形成，总的通道水含量增加。在优先突破位置，液滴从GDL中流出。但是，这些突破性的位置会间歇性地变化，这表明GDL中水路的动态互连。实验通过计算流体动力学（CFD）模拟进行了补充，使用流体体积法来说明动态喷发机理。

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