One way to cool tiny electronic devices is using minichannels as heat sinks. Due to the low space in these channels, during cooling, the pressure drop is high and sealing them at the inlet is expensive. Using distributed micropins with high porosity is a suitable way to increase the heat transfer rate without sensible increase in the pressure drop. In this paper, based on the two-phase model theory, a new method has been introduced to study heat transfer in porous medium with high porosity. In this method, the whole solution domain is considered as an integrated unit and the effects of the presence of pins appear in the momentum equations as drag forces and in the energy equation as a source term. As a case study, the pressure drop and heat transfer rate by cylindrical micropins with linear, staggered, and random distribution in a wide range of Reynolds (0 < Re < 1000) and Prandtl numbers (0.7 < Pr < 5) are studied and the governing equations are solved by a control volume method (SIMPLE algorithm). The most important result is the Nusselt number-friction factor ratio, which is 5789.2, 6417.23, and 8088.26 for inline, staggered, and random arrangements in Re = 1000, Pr = 3.5, respectively. This result shows that the random arrangement has a better operation.

中文翻译：

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高孔隙率多孔介质对流传热分析中的两相模型，案例研究：MICROPINS 配备的微通道

冷却微型电子设备的一种方法是使用微型通道作为散热器。由于这些通道中的空间很小，在冷却过程中，压降很高，并且在入口处密封它们的成本很高。使用具有高孔隙率的分布式微针是一种合适的方法，可以在不显着增加压降的情况下提高传热率。本文基于两相模型理论，引入了一种研究高孔隙率多孔介质传热的新方法。在该方法中，整个求解域被视为一个整体单元，并且销的存在的影响在动量方程中作为阻力出现，在能量方程中作为源项出现。作为案例研究，具有线性、交错、研究了各种雷诺数 (0 < Re < 1000) 和普朗特数 (0.7 < Pr < 5) 的随机分布，并通过控制体积法（SIMPLE 算法）求解控制方程。最重要的结果是 Nusselt 数-摩擦系数比，对于 Re = 1000、Pr = 3.5 的内联、交错和随机排列，分别为 5789.2、6417.23 和 8088.26。这个结果表明随机排列有更好的操作。