燃料電池具有低污染、高效率及可靠之特性，目前已被視為明日能源之星。因此，本研究針對質子交換膜燃料電池三維、動態及非等溫之流場特性，建立一計算模擬程式。並以此模擬程式分析模擬質子交換膜燃料電池陽極流場、陽極擴散層、高分子薄膜電極組合、陰極擴散層及陰極流場等五區域之流場。由模擬結果發現，擴散層之多孔性材質能有效地控制質子交換膜燃料電池之溫度。不僅能降低其溫度，也使得溫度分佈較為均勻。在等溫壁面條件下，陰極產生之熱大部分藉由壁面熱傳導散出，流場溫度增幅不大，進氣當量比之影響也相對地較不顯著。燃料電池不可逆功放熱量隨之增加，流場溫度亦隨之增高。模擬結果亦發現，當陰極生成物量多向外擴散時，會造成陰極擴散層流場背向質子交換膜流動。因此，出現陰陽兩極流場平均速度同向之現象。同時，流場溫度會隨著擴散層孔隙率增加而提高。此研究結果將可提供質子交換膜燃料電池熱管理設計之參考。

　Fuel cells are recognized as the star of future’s energy by virtue of their clean, efficient, and reliable service. In the present study, a comprehensive numerical simulation model has been successfully developed for the three-dimensional, dynamic and non-isothermal flow of proton exchange membrane fuel cells. The model is able to solve the five rgions, including the anode flow channel, the anode diffusion layer, MEA(Membrane Electrode Assembly), the cathode diffusion layer, and the cathode flow channel, simultaneously. The results obtained from the numerical simulation indicate that the temperature in a PEMFC exhibits a lower value and a more uniform distribution with gas diffusion layers. When the channel wall is at a specified temperature, the heat generated from the cathode side is greatly dissipated from the channel wall by conduction. The flow temperature increases only mildly, and the effect of the stoichiometric flow ratio of fuel and air is thus relatively insignificant. Generation of the irreversible work in a fuel cell is mainly due to the change of the chemical entropy and the internal losses. As the current density is increased, the irreversible work increases, resulting in a higher temperature. It is also interesting to find that the diffusion of the massive reation products from the cathode electrode toward the cathode flow channel makes the flow direction in the cathode diffusion layer against the MEA. In other words, the flows in the anode and cathode diffusion layers exhibit the same flow direction. Moreover, the flow temperature increases with increasing permeability of the diffusion layer. The present results are useful for an optimum design of fuel cells working with proper thermal managements.

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