Numerical simulation of proton exchange membrane fuel cell catalyst ink mixing process
In this paper,the mixing process of the catalyst ink for proton exchange membrane fuel cell is investigated.The relationship between the rheological properties and density of the ink and the volume fraction of platinum-carbon particles is experimentally determined.A three-phase multiphase flow model for the mixing process is developed specifically for the preparation of polymer electrolyte fuel cell ink.Numerical simulations are performed to analyze the flow field and dispersion characteristics of platinum-carbon particles considering the influence of both blade stirring and high-speed shear dispersion.The results suggest that the large-scale flow structures generated by the mixing blade are ineffective in preventing the settling of platinum-carbon particles.However,by introducing a high-speed shear dispersion device,the settling of platinum-carbon particles can be alleviated to some extent.Additionally,the dispersion characteristics of platinum-carbon particles in the flow field can be improved due to the mixing effect of this device.The results could provide an important guide for the design and improvement of ink-mixing devices,and offer substantial theoretical support for the efficient preparation of catalyst ink for proton exchange membrane fuel cells.
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