Numerical and experimental study of two-phase flow uniformity in channels of parallel PEM fuel cells with modified Z-type flow-fields

The aim of this study is to improve two-phase flow uniformity of proton exchange membrane fuel cells (PEMFCs) with parallel flow-fields. Therefore, a series of experiments are performed to find the relevance of cathode stoichiometry ratio, unsteady distribution of water coverage ratios and power of a PEMFC with Z-type flow-field. The experimental results indicate that at high cathode stoichiometry ratios, the power and efficiency are stable but...