Abstract
The comprehensive three-dimensional model of a 10-channel anode-supported planar solid oxide fuel cell (SOFC) unit was developed in commercial Fluent CFD modeling platform with self-designed external VC++ sub-routine for the SOFC unit by considering mass, momentum, energy and charge balance equations. The continuum micro-scale PEN sub-model coupled the processes of ionic/electronic charge transport, porous electrode diffusion as well as the effects of electrode micro-structures. The PEN sub-model was well validated by the SOFC button cell experimental data. The effects of operating conditions parameters, cell unit macro structure (inter-connector rib), as well as the porosity of anode and cathode on cell performance, and the distribution of temperature, flow rate and current density was studied in detail. The proposed model was a possible tool for combined optimization of micro-scale electrode structures and macro-scale channel geometries, which also can be expended to be applied in SOFC stack level.
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