文献类型：期刊文献

英文题名：Revealing the impact of two-phase flow in different length channels on mass transfer and performance of fuel cells

作者：Zhang, Xiaoqing[1];Zhou, Yuqiao[3];Zhang, Zhaohuan[2];Ma, Xiao[2];Xuan, Fu-Zhen[1,4,5];Shuai, Shijin[2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Tsinghua Univ, Sch Vehicle & Mobil, State Key Lab Intelligent Green Vehicle & Mobil, Beijing 100084, Peoples R China;[3]Shanghai Power Equipment Res Inst Co Ltd, Shanghai 200240, Peoples R China;[4]East China Univ Sci & Technol, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2027

卷号：429

外文期刊名：FUEL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001843305800001)】；

基金：This research is supported by Natural Science Foundation of China (Grant No. 52576125) , National Key R&D Program of China (Grant No. 2024YFB2505405) , Self-funded Scientific Research Project of SPIC Energy Science and Technology Research Institute (Project No. 202698220J): Research on Anti-toppling Monitoring Technology for Wind Turbine Generators.

语种：英文

外文关键词：Two-phase flow; Channel length; Mass transfer; Performance; Multiphysics coupled model

摘要：Two-phase flow within the channels of proton exchange membrane fuel cells critically governs reactant transport and overall cell performance, yet the role of channel length in modulating these effects remains insufficiently understood. In this study, we develop a coupled multiphysics framework that integrates a volume-of-fluid model for gas-liquid interface tracking with comprehensive transport and electrochemical governing equations. This approach enables, for the first time, a systematic investigation of how channel length influences two-phase flow morphology and, in turn, the underlying mass transfer and reaction rate. The results reveal that while channels of different lengths capture the same qualitative trends of two-phase flow effects, shorter channels systematically overestimate the detrimental impacts on mass transport and performance degradation. Specifically, as channel length increases from 50 mm to 150 mm, the two-phase-to-single-phase pressure drop ratio decreases from 14.04 to 3.48, and the amplitude of current density fluctuations increases from 8 to 9% to 25-30%. Moreover, the average oxygen concentration in the cathode catalyst layer predicted by two-phase simulations exhibits a reversal relative to single-phase predictions beyond 125 mm, indicating that longer channels with detailed interface tracking yield more realistic oxygen transport characteristics. These findings highlight the critical importance of channel-length-dependent two-phase dynamics and provide rational guidance for selecting computational domain dimensions in large-scale fuel cell simulations.