Study on the Mass Transfer Performance of Metal Foam Flow Fields in PEMFC
The three-dimensional form of the metal foam flow field is established.Through three-dimensional numerical simulation,the results show that the metal foam flow field can effectively reduce the concentration polarization loss,thereby improving the performance of the fuel cell at high current densities.The increase in output power density is significant,while the corresponding pumping power loss is negligible.Furthermore,under the influence of the metal foam flow field,the oxygen concentration distribution inside the PEMFC is more uniform than that in the traditional straight-channel fuel cells.Bench experiments were conducted to observe the flow state of liquid water in the foam flow field and similar flow phenomenon was obtained through three-dimensional numerical simulations.Compared with the traditional straight-channel designs,the metal foam flow field is of great help in improving the flooding phenomenon in fuel cells.
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