| Summary: | 碩士 === 南榮科技大學 === 工程科技研究所碩士班 === 103 === A three-dimensional numerical model of multi-component mixture transport is presented and implemented in COMSOL Multiphysics to study the affections of the operation parameters and the physical properties on the performance and the electric fields in the planar solid oxide fuel cell (SOFC) with 10mm×1.0mm×1.3mm. The modeled section of the SOFC consists of the gas channels, the anode, the cathode, and the electrodes. The model contains the conservation of mass, momentum, species, and charge with electrochemical reactions.
According to the numerical results, both the hydrogen mass fraction in the anode and the oxygen mass fraction in the cathode decrease along the flow direction, but the water mass fraction will increase. The maximum normal current density occurs at the inlet of the cathode. All the parameters, such as the fuel flow directions, the physical properties of the porous electrodes and the operation conditions of the fuel cells, have unapparent effects upon the fuel cell performance and the electric fields at low current density. Increasing the overpressure at the inlets of the anode and the cathode, the porous material permeability, the porous material conductivity, the bipolar plate conductivity, and reactants overpressure at the inlets, reducing the fuel cell operation temperature and the tortuosity of the porous media can improve the SOFC performance and the electric fields at high current density. The maximum power output for the unit SOFC occurs at cell voltage 0.65V.
Keywords: Multi-Component Mixture Transport, Planar Solid Oxide Fuel Cell, Conservation of Charge, Normal Current Density
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