Abstract The micro-channel heat dissipation system has minor specifications and good thermal conductivity per unit, which is the best choice for heat dissipation of micro-chips. By optimizing the cross section of microchannel, the heat exchange efficiency and temperature uniformity can be effectively improved. In this article, a double-layer triangular microchannel heat sink is proposed, which uniquely combines triangular cross section and double-layer structure to obtain a better heat dissipation performance. A new thermal resistance network model is established. At the same time, the model of pressure drop in microchannel heat sink is obtained by use of fluid theory. Taking thermal resistance and pressure drop as optimization objectives, the thermal resistance of double-layer triangular microchannel heat sink is 0.284 K/W and the pressure drop is 1386.89 Pa by using the firefly algorithm based on the Pareto optimal solution set, obtaining the optimal structural parameters. The thermal-flow-solid coupling simulation analysis shows that the thermal resistance and theoretical analysis error is 5.19%, and the pressure drop and theoretical analysis error is 9.49%, which can verify the accuracy of the thermal resistance network model. This article has a guiding significance for the thermal resistance analysis and heat dissipation improvement of non-rectangular cross section microchannel heat sinks.

中文翻译：

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基于热阻网络的双层三角微通道散热器建模与萤火虫算法多元结构优化

摘要 微通道散热系统规格小，单位导热性好，是微芯片散热的最佳选择。通过优化微通道截面，可以有效提高换热效率和温度均匀性。在本文中，提出了一种双层三角形微通道散热器，它独特地结合了三角形截面和双层结构，以获得更好的散热性能。建立了新的热阻网络模型。同时，利用流体理论建立了微通道散热器压降模型。以热阻和压降为优化目标，双层三角形微通道散热器的热阻为0。284 K/W，压降1386.89 Pa，采用基于Pareto最优解集的萤火虫算法，得到最优结构参数。热-流-固耦合仿真分析表明，热阻和理论分析误差为5.19%，压降和理论分析误差为9.49%，可以验证热阻网络模型的准确性。本文对非矩形截面微通道散热器的热阻分析和散热改进具有指导意义。压降和理论分析误差为9.49%，验证了热阻网络模型的准确性。本文对非矩形截面微通道散热器的热阻分析和散热改进具有指导意义。压降和理论分析误差为9.49%，验证了热阻网络模型的准确性。本文对非矩形截面微通道散热器的热阻分析和散热改进具有指导意义。