The pressure drop reduction is attributed to “slip” of coolant on the channel wall due to the presence of porous fins. The results show that the pressure drop of the new design is reduced by 43.0% to 47.9% at various coolant flow rates as compared with that of the conventional heat sink, with only about 5% increase in the thermal resistance. The Forchheimer–Brinkman–Darcy model is used to investigate the effectiveness of this design. An optimal cell temperature is presented to maximize the cell performance.Ībstract: In this work, we propose a new design concept of microchannel heat sink, in which solid fins are replaced by porous fins, to reduce the pressure drop across the heat sink. High cell temperature evaporates fast the liquid water, hence reducing the cathode flooding however, the yielded low membrane water content reduces proton transport rate, thereby increasing ohmic resistance of membrane. Low thermal conductivities of porous layers in the cell and low heat transfer coefficients at the surface of current collectors, as commonly adopted in cell design, increase the cell temperature. This work aims at exploring how a non-isothermal cell body affects the performance of PEM fuel cells with single and double serpentine cathode flow fields, considering the effects of flow channel cross-sectional areas. TL DR: In this article, a non-isothermal cell body was explored for PEM fuel cells with single and double serpentine cathode flow fields, considering the effects of flow channel cross-sectional areas.Ībstract: Mathematical models on transport processes and reactions in proton exchange membrane (PEM) fuel cell generally assume an isothermal cell behavior for sake of simplicity.
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