STUDY ON MASS TRANSFER AND PERFORMANCE OF GRADUAL FLOW FIELD STRUCTURE IN PEM ELECTROLYSIS CELLS
The parallel and serpentine flow fields of the traditional proton exchange membrane(PEM)electrolysis cells have poor electrical performance,due to weak mass transfer.In view of this,this paper proposed a gradually-varied flow field.The changes of flow velocity,pressure,gas distribution and current density distribution in the flow field under different inflow directions(denoted as gradualⅠ-type and gradual Ⅱ-type,respectively)were compared by numerical simulation.The results show that the pressure drop of the gradual Ⅰ-type flow field is second only to the parallel flow field,which has a higher flow velocity and can also effectively and rapidly discharge gas.The average current density achieved by gradual Ⅰ-type flow field is 8%higher than that of the serpentine and 4%higher than that of the parallel.The PEM electrolysis cells with gradual Ⅰ-type flow field has better electrical performance.
hydrogen productionelectrolytic cellsnumerical simulationflow fieldsmass transfer
万方数据
维普
