Droplet dynamic characteristics on PEM fuel cell cathode gas diffusion layer with gradient pore size distribution
Droplet dynamic characteristics on PEM fuel cell cathode gas diffusion layer with gradient pore size distribution
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梯度孔径分布的质子交换膜燃料电池阴极气体扩散层液滴动态特性
DOI：
10.1016/j.renene.2021.06.135
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发表时间：
2021-11
期刊：
影响因子：
8.7
通讯作者：
Qin Yanzhou
中科院分区：
文献类型：
--
作者：
Wang Yulin;Wang Xiaodong;Wang Xiaoai;Liu Tao;Zhu Tingting;Liu Shengchun;Qin Yanzhou
了解聚合物电解质膜(PEM)燃料电池气体扩散层上液滴的动态特性对提高电池性能具有重要意义。研究了具有梯度孔径分布(GPSD)的燃料电池阴极GDL液滴动力学特性。通过分析液滴上作用力之间的相互作用，采用流体体积(VOF)方法，数值计算了不同孔径、不同几何尺寸和不同润湿性的GDL对液滴动态特性的影响。结果表明，与中等疏水的GDL相比，超疏水和超亲水GDL的液滴脱离时间较短，脱离半径较小，与孔径大小无关。此外，大孔有利于液滴的脱离，但增大了液滴的脱离半径和压降。与均匀(U)型PSD相比，横向(T)-GPSD在相对较低的气流速度下具有较小的孔距或在较高的气流速度下具有较大的孔距，或纵向(L)-GPSD在较大的孔距下具有上游大孔和下游小孔的PSD，液滴脱离时间分别缩短了34.3%和25.2%，同时降低了压降。
Understanding of droplet dynamic characteristics on gas diffusion layer (GDL) of polymer electrolyte membrane (PEM) fuel cell is of great importance for cell performance improvement. This study comprehensively investigated droplet dynamic characteristics on fuel cell cathode GDL with gradient pore size distribution (GPSD). The influence of different pore sizes, GPSD and wettabilities of GDL on droplet dynamic characteristics is numerically evaluated by using the volume of fluid (VOF) method through the analysis of the interaction among the forces over droplet. Results indicate that droplet has a relatively short detachment time and a smaller detachment radius on superhydrophobic and superhydrophilic GDLs compared with on a moderately hydrophobic GDL regardless of pore size. Moreover, large pores can facilitate droplet detachment, but increase droplet detachment radius and pressure drop. Compared with uniform (U)PSD, for transverse (T)-GPSDs with a small pore distance at a relatively low airflow velocity or a large pore distance at a high airflow velocity, or for the longitudinal (L)-GPSD with a large pore in the upstream and a small pore in the downstream at a large pore distance, the droplet detachment time decreases by 34.3% and 25.2% with a reduction of pressure drop, respectively.
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