The performance of a direct methanol fuel cell (DMFC) can be significantly reduced by methanol crossover. One method to reduce methanol crossover is to utilize a flowing electrolyte channel. This is known as a flowing electrolyte-direct methanol fuel cell (FE-DMFC). In this study, recommendations for the improvement of the flowing electrolyte channel design and operating conditions are made using previous modelling studies on the fluid dynamics in the porous domain of the flowing electrolyte channel, and on the performance of a 1D isothermal FE-DMFC incorporating multiphase flow, in addition to modelling of the non-isothermal effects on the fluid dynamics of the FE-DMFC flowing electrolyte channel. The results of this study indicate that temperature difference between flowing electrolyte inflow and the fuel cell have negligible hydrodynamic implications, except that higher fuel cell temperatures reduce pressure drop. Reducing porosity and increasing permeability is recommended, with a porosity of around 0.4 and a porous material microstructure typical dimension around 60-70 μm being potentially suitable values for achieving these goals. Copyright

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Persistent URL dx.doi.org/10.1115/FuelCell2013-18122
Conference ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2013 Collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability
Citation
Duivesteyn, E. (Eric), Cruickshank, C, & Matida, E. (2013). Non-isothermal hydrodynamic modelling of the flowing electrolyte channel in a flowing electrolyte-direct methanol fuel cell. Presented at the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2013 Collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability. doi:10.1115/FuelCell2013-18122