Abstract In this work, hydrodynamics and heat transfer of alumina–water nanofluid in a microchannel heat sink (MCHS) are simulated and discussed. Attention in focused to analyze how the use of nanofluids as well as vertical/horizontal porous substrates on the channel walls may alter performance of the system, compared to other design variables. To this aim, a three–dimensional solid–fluid conjugate model in conjunction with the two–phase mixture model for the nanofluid and the Dacry–Brinkman–Forchheimer model for the porous medium is utilized. Sensitivity analysis of design variables is performed using the Taguchi method and analysis of variance (ANOVA). The mean temperature of the CPU surface, the overall thermal resistance, the required pumping power, and the figure of merit are considered as the performance parameters. An L27 orthogonal array is utilized as the experimental plan for the current design variables including thickness of the vertical/horizontal porous substrates, material of the MCHS and the porous substrates, the inlet velocity, and the nanoparticles fraction. It is found that the highest contribution on the mean temperature of the CPU surface, the overall thermal resistance, and the figure of merit belongs to the material of the MCHS and the porous substrates.

中文翻译：

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基于田口的多孔基材微通道散热器 (MCHS) 中纳米流体的流体动力学和传热灵敏度分析

摘要 在这项工作中，模拟和讨论了微通道散热器 (MCHS) 中氧化铝-水纳米流体的流体力学和传热。与其他设计变量相比，重点分析在通道壁上使用纳米流体以及垂直/水平多孔基材如何改变系统的性能。为此，使用三维固体-流体共轭模型，结合纳米流体的两相混合物模型和多孔介质的 Dacry-Brinkman-Forchheimer 模型。使用田口方法和方差分析 (ANOVA) 进行设计变量的敏感性分析。CPU 表面的平均温度、整体热阻、所需的泵送功率和品质因数被视为性能参数。L27 正交阵列用作当前设计变量的实验计划，包括垂直/水平多孔基材的厚度、MCHS 和多孔基材的材料、入口速度和纳米颗粒分数。发现对 CPU 表面平均温度、整体热阻和品质因数的贡献最大的是 MCHS 的材料和多孔基板。