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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical study on drag reduction and heat transfer enhancement in microchannels with superhydrophobic surfaces for electronic cooling
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Numerical study on drag reduction and heat transfer enhancement in microchannels with superhydrophobic surfaces for electronic cooling

机译：电子冷却超疏水表面微通道减阻传热增强的数值研究

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Microchannels with superhydrophobic surfaces are a promising candidate for electric cooling with mild frictional penalty. Frictional and thermal performance of laminar liquid-water flow in such microchannels is numerically investigated for various shear-free fractions and Reynolds numbers. The structures on superhydrophobic surfaces include square posts and holes, transverse and longitudinal grooves. Combined frictional and thermal performance of microchannels is evaluated by a goodness factor, and is compared with that of smooth plain channels. It is found that with increasing shear-free fractions, both friction factor and average Nusselt number deteriorate for four surface patterns; however, goodness factor is improved significantly over smooth plain channels. In general, superhydrophobic surfaces containing longitudinal and transverse grooves exhibit the lowest and highest frictional and thermal performance, respectively; however, combined performance of these two are on opposite. Among four surface patterns, longitudinal grooves have the highest goodness factors, except at high shear-free fractions or high Reynolds numbers where overall performance is surpassed by square posts. At very low or high shear-free fractions, frictional and thermal performance of two-dimensional square posts and holes approaches that of one-dimensional longitudinal or transverse grooves. Our study suggests microchannels with superhydrophobic surfaces as promising candidates for efficient cooling devices. (C) 2014 Elsevier Ltd. All rights reserved.
机译：具有超疏水表面的微通道是用于电冷却且摩擦力较小的有前途的候选材料。对于各种无剪切分数和雷诺数，对此类微通道中层流-水流的摩擦和热性能进行了数值研究。超疏水表面上的结构包括方柱和孔，横向和纵向凹槽。通过优度因子评估微通道的组合摩擦和热性能，并将其与光滑平通道的摩擦和热性能进行比较。发现随着无剪切分数的增加，四个表面图案的摩擦系数和平均努塞尔数均变差。但是，与平滑的平原渠道相比，良性因子显着提高。通常，包含纵向和横向沟槽的超疏水表面分别表现出最低和最高的摩擦性能和热性能。但是，两者的综合性能却相反。在四个表面图案中，纵向凹槽具有最高的品质因数，除了在高无剪切分数或高雷诺数的情况下，其整体性能被方柱超越。在非常低或很高的无剪切分数下，二维方柱和孔的摩擦和热性能接近一维纵向或横向凹槽的摩擦和热性能。我们的研究表明，具有超疏水表面的微通道有望成为高效冷却设备的有希望的候选者。 （C）2014 Elsevier Ltd.保留所有权利。

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