A three-dimensional numerical study on the combined effect of height as well as width tapering on the thermal performance of double taper microchannel is presented in this paper. The channel inlet width is considered as 300 µm, taper ratio on sidewalls and bottom wall are varied from 0 to 1 and 1 to 3.9, respectively. The thermal resistance ratio, average bottom wall temperature, temperature difference ratio, and pumping power ratio of the channel are evaluated for various flow rates, height, and width tapering. Results showed higher reduction of wall temperature with combined effect height as well as width tapering compared with straight channel. The optimal size of the micro channel to minimize the pumping power and average wall temperature on the constraint of heat flux and footprint area is found. The reduction in average bottom wall temperature is 17.34%, and pumping power ratio is 0.44 (56% power reduction) noted, respectively, at Reynolds number 340. Finally, optimal dimension of double taper microchannel is evaluated for better thermo-hydraulic performance.

本文提出了高度和宽度逐渐变细对双锥形微通道热性能的综合影响的三维数值研究。通道入口宽度被认为是 300 µm，侧壁和底壁的锥度比分别从 0 到 1 和 1 到 3.9 变化。通道的热阻比、平均底壁温度、温差比和泵浦功率比针对不同的流速、高度和宽度逐渐变细进行评估。结果表明，与直通道相比，具有组合效应高度和宽度逐渐变细的壁温降低幅度更大。找到了在热通量和足迹面积的约束下最小化泵浦功率和平均壁温的微通道的最佳尺寸。