Liquid water transport in straight micro-parallel-channels with manifolds for PEM fuel cell cathode |
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| Affiliation: | 1. Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran;2. Centre for Solar Energy and Hydrogen Research (ZSW), Helmholtzstr. 8, 89081 Ulm, Germany;3. Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran;1. College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, China;2. College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, Fujian, China;3. School of Information Science and Engineering, Central South University, Changsha, 410082, China;1. Multiphase Flow Lab, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran;2. In Sabbatical Leave in Department of Mechanical and Industrial Engineering, Faculty of Applied Science and Engineering, University of Toronto, Toronto, Ontario, Canada;3. Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, New York, USA |
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| Abstract: | Water management in a proton exchange membrane (PEM) fuel cell stack has been a challenging issue on the road to commercialization. This paper presents a numerical investigation of air–water flow in micro-parallel-channels with PEM fuel cell stack inlet and outlet manifolds for the cathode, using a commercial Computational Fluid Dynamics (CFD) software package FLUENT. Different air–water flow behaviours inside the straight micro-parallel-channels with inlet and outlet manifolds were simulated and discussed. The results showed that excessive and unevenly distributed water in different single PEM fuel cells could cause blockage of airflow or uneven distribution of air along the different flow channels. It is found that for a design with straight-channels, water in the outflow manifold could be easily blocked by air/water streams from the gas flow channels; the airflow could be severely blocked even if there was only a small amount of water in the gas flow channels. Some important suggestions were made to achieve a better design. |
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