| Summary: | 碩士 === 元智大學 === 機械工程學系 === 98 === This paper employs a 3D CFD simulation technique to study important physical parameters such as temperature, potential and current density distributions of a micro PEM fuel cell. Simulation results are validated by experiments based on the micro sensor measurement. The flow field configuration used is double-serpentine and the reaction area is 5.29cm2. The operation temperature is set to be 65℃ and the fuel is assumed to be fully humidified. The results show that the temperature difference between simulation and experiment are 0.1℃and 1.5℃ for high and low voltage, respectively. At high current density operation condition, some of the liquid water is found at the anode side because of the back diffusion from cathode side. In the conditions of half humidity under various operating temperature, 65℃ case shows better performance. On the other hand, if we fixed operating temperature and changed humidity The membrane proton conductivity increases with increasing humidity because of the higher water content inside membrane. Large amount of water vapor is tend to affect the transportation of oxygen into porous media in the case of 85℃ with fully humidify condition.
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