Temperature distribution affects water transport in the porous medium layer of proton exchange membrane fuel cell (PEMFC) by phase-change-induced (PCI) flow. Thus, it is meaningful to reveal the role of PCI flow in removing water. In the present work, a 1-D, non-isothermal, two-phase model is employed to investigate the water transport in cathode gas diffusion layer (GDL) and micro porous layer (MPL). A dimensionless parameter $\mathit{Ts}$ is also proposed to characterize the relation between PCI flow and capillary-driven (CD) flow. It is found that elevating the operating temperature (from 323.15 K to 363.15 K) can facilitate the PCI flow. The high anode and low cathode relative humidity (RHa90%/RHc50%) case contributes to the optimal output performance, corresponding to the largest $\mathit{Ts}$ number and thermal strain. The thermal strain is insignificant compared with the swelling strain and the hygrothermal strain is influenced by the combination of output performance, water distribution and operating conditions. Furthermore, reducing water saturation ($s_c$) at the GDL/gas channel (GC) interface (from 0.12 to 0.0) is conducive to enhancing the proportion of PCI flow in GDL and MPL. By adjusting the operating temperature, inlet RH and removing water at the GDL/GC interface in time enable enhancement of PCI flow and better performance. This work aims to provide a valuable reference for understanding the water transport process and optimizing water management.

温度分布通过相变诱导 (PCI) 流影响质子交换膜燃料电池 (PEMFC) 多孔介质层中的水传输。因此，揭示PCI流在除水中的作用是有意义的。在目前的工作中，采用一维、非等温、两相模型来研究阴极气体扩散层 (GDL) 和微孔层 (MPL) 中的水传输。无量纲参数$\mathit{Ts}$还建议表征 PCI 流量和毛细管驱动 (CD) 流量之间的关系。发现提高工作温度（从 323.15 K 到 363.15 K）可以促进 PCI 流动。高阳极和低阴极相对湿度 (RHa90%/RHc50%) 的情况有助于优化输出性能，对应于最大的$\mathit{Ts}$数和热应变。与膨胀应变相比，热应变微不足道，湿热应变受输出性能、水分布和操作条件的综合影响。此外，降低水饱和度（${秒}_C$) 在 GDL/气体通道 (GC) 界面（从 0.12 到 0.0）有利于提高 PCI 流量在 GDL 和 MPL 中的比例。通过调整操作温度、入口相对湿度和及时去除 GDL/GC 接口处的水，可以增强 PCI 流量和更好的性能。本工作旨在为了解水运过程和优化水管理提供有价值的参考。