S型流道冷板的流体域熵产分析及流道优化

粘性流体在流动和传热过程中,由于粘性耗散和热传导的存在造成能量损失。为分析流体流动和传热过程的能量损失并得到冷板的最优流道形式,本文以某电子器件用S型流道液冷冷板为分析对象,通过数值模拟,得到S型流道液冷冷板的流体域熵产率随工质流量的变化规律,对流体域充分发展的直段和弯段内熵产率大小进行了比较,并在固定流量下,分析了熵产率大小沿工质流动方向上的变化情况。提出冷板流道优化方案,并从换热表现、压头损失和总能量损失三方面对不同流道形式的冷板进行了综合评价和比较,得到了冷板流道的最优形式,为工程实际提供参考。

Entropy-generation Analysis and Flow Optimazation for the Cooling-plate with a Serpentine Flow Channel

Energy loss occurs in the process of flow and heat transfer with the viscous fluid.To analyze the energy loss and get the optimal flow channel of the cooling-plate,we have got entropy-generation rate which is variable with the working medium flow in the fluid domain of the cooling-plate with serpentine flow channel by numerical simulation.Results show the minimum flow rate for the least entropy generation.Besides,the entropy generation generating in the straight section is contrasted with the entropy generation in the curved section of the flow channel.In addition,the variation of the entropy generation along the flow direction have been analyzed in a constant flow rate.Then three projects are compared to get the best flow channel with a comprehensive evaluation which includes the heat transfer performance,head loss and energy loss,and can provide reference for the engineering practice.