Simulation study of energy efficiency of proton exchange membrane electrolyzer based on fluid phase field under microgravity

In microgravity, bubble management within PEMWE is extremely important for the energy conversion efficiency of the system. In this study, a multiphysics model based on electrochemical model coupled with fluid phase field was developed to study the influence of basic parameters on bubble migration behavior and electrochemical efficiency in PEMWE under gravity microgravity environment.

The results show that in the microgravity environment, high inlet water flow velocity should be avoided, so as to reduce the bubble coverage of the bottom wall. To avoid forming a thin film flow blocking the lower wall of the runner, it is recommended that the anode runner maintain a depth of 1 mm while avoiding high outlet pressure. In the gravity environment, the inlet water velocity has a relatively low effect on the bubble coverage of the lower wall.