Abstract: Two-phase flow in channels and water and gas management of proton exchange membrane fuel cell （including H2/O2 PEMFC and direct methanol fuel cell） have a great influence on its performance and life. Visualization technique is one of the most powerful tools to study the two-phase flow in a fuel cell. The formation and development of gas bubbles or water droplets in channels are truly presented by the visualization study. Moreover, it can help us to understand the evolution mechanism，optimize water and gas management and improve the performance of the fuel cell. This article reviews the experimental and theoretical studies relating to visualization of two-phase flow and transport in proton exchange membrane fuel cells，discusses the wettability of the diffusion layer and water transport mechanism, presents a variety of techniques for visualization and puts forward some disadvantages and the development direction of visualization study.

摘要： 质子交换膜燃料电池（包括氢氧质子交换膜燃料电池和直接甲醇燃料电池）内的两相流动以及相应的水管理、气管理对燃料电池的性能和寿命有很大的影响，而可视化方法是研究流场槽道内两相流动非常重要的方法之一。可视化实验可以真实地展示气泡或液滴在流场槽道内的生成以及发展过程，有利于了解其进化机制，从而进一步优化气管理、水管理并提高电池性能。本文主要综述了质子交换膜燃料电池两极流场内两相流动的可视化研究进展，讨论了扩散层的润湿性以及扩散层内水的传递机理，还介绍了实现可视化的方法，并提出了可视化研究的不足及发展方向。