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Characteristics of oxygen bubble transport process in proton exchange membrane electrolysis cell |
(1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, Hubei 430070, China; 2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, Hubei 430070, China; 3. Clean Energy Research Centre, Department of Chemical and Biological Engineering, University of British Columbia, Vancouver V6T 1Z3, Canada)
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Abstract The dynamic behaviors of a single oxygen bubble in the anode flow field of proton exchange membrane electrolysis cell (PEMEC)were investigated. The effects of porous transport layer (PTL) contact angle, water flow rate, oxygen generating rate and pore size on the motion characteristics of oxygen bubbles in the flow channel were analyzed by the volume of fluid (VOF) method. The simulation results show that hydrophilic PTL is beneficial to detach bubble, reduce the gas coverage ratio and promote the reactants to catalytic layer. High liquid water flow rate can reduce the bubble detachment time and volume and lower the surface gas coverage ratio and volume gas content to promote the bubble exhausting from the channel. The increasing of gas generation rate can increase the volume gas content and gas coverage ratio, which is not conducive for the performance. With the increasing of pore size, the bubble detachment volume is increased, and the detachment time is decreased with latter increasing.
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Received: 11 November 2019
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