文献类型：期刊文献

英文题名：A novel spider-web-like design of transition zone to improve two-phase flow uniformity for large-scale proton exchange membrane fuel cells

作者：Wang, Bin[1];Pan, Weitong[1,2];Hu, Zichao[1];Zhang, Guoyu[1];Tang, Longfei[1];Chen, Xueli[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Div Proc Equipment Sci & Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：623

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20243917107047);WOS:【SCI-EXPANDED(收录号:WOS:001327274400001)】；

基金：The research is supported by the China National Postdoctoral Pro-gram for Innovative Talents (BX20230121) , China Postdoctoral Science Foundation (2023M741163) , and Shanghai Post-doctoral Excellence Program (2023741) .

语种：英文

外文关键词：PEM fuel cells; Two-phase flow distribution; Spider-web-like transition zone; Flow field plate; Pressure regulation

摘要：Two-phase flow uniformity in the Flow Field Plate (FFP) is significant to the performance and durability of Proton Exchange Membrane (PEM) fuel cells, which is a scarce aspect in the existing studies to our knowledge. The objective of this work is to examine and optimize the gas-liquid two-phase flow distribution. A Coefficient of Variation (CV), defined as the ratio between the velocity standard deviation and the mean velocity of all channels, is utilized to quantitatively represent flow uniformity. Firstly, a three-dimensional two-phase Mixture model of the FFP with an active area of 257.4 cm(2) is constructed. The conventional "two-in-one" transition zone is revisited, and the effects of liquid water on flow uniformity are explored. The introduction of liquid water results in a different flow distribution compared to the single-phase flow, leading to reduced flow uniformity. Secondly, a novel spider-web-like transition zone is proposed to improve two-phase flow uniformity. The design philosophy and methodology are elucidated. The CV is reduced by 57.62 %. Thirdly, the superior impacts of the novel design on flow uniformity and cell performance are validated via a three-dimensional two-phase full-scale model of PEM fuel cells. The current density is enhanced from 1.270 A/cm(2) to 1.306 A/cm(2).