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Analysis of porous filled heat exchangers for electronic cooling

机译：电子冷却用多孔填充热交换器的分析

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摘要

An innovative porous filled heat exchanger is modeled to investigate the cooling effectiveness and temperature distribution at its base subject to a high heat flux. The effects of different nanofluid coolants (5% titanium dioxide (TiO2) in water, 1% alumina in water, 0.03% multi walled carbon nanotubes (MWCNT) in water, and 1% diamond in 40:60 ethylene glycol/water), different porous materials (copper and annealed pyrolytic graphite (APG)), and porosity values are investigated. The coolant enters from an inlet channel normal to the base, moves through the porous medium, and leaves the heat exchanger through two opposite exit channels parallel to the base. The effects of the inclination angle of the foam filled channel, inlet velocity value, and heat flux value are also studied. In addition, the effect of the inlet cross section is investigated by studying two different designs. One of the designs has a rectangular cross sectional inlet channel (extended all along the transverse direction) and the other design has a square one. The results indicate the importance of the utilization of a high conductive porous material. Utilization of APG porous matrix improves the cooling effectiveness at the base of the heat exchanger, for all studied coolants of pure water and water based nanofluids. The results also show that utilizing titanium dioxide nanofluids (TiO2) as coolant for both copper and APG porous matrices at low and high porosity structures, and for both square and rectangular inlet cross sections improves the cooling efficiency and temperature uniformity over the base. Investigation of the effect of inlet channel geometry, i.e., square and rectangular, indicates that employing a square cross section inlet channel would result in lower temperature values along the streamwise direction while higher temperature values are observed far from the center in transverse direction. (C) 2018 Elsevier Ltd. All rights reserved.
机译：对一种创新的多孔填充式换热器进行建模，以研究其在高热通量下的冷却效率和温度分布。不同的纳米流体冷却剂（水中5％的二氧化钛（TiO2），水中1％的氧化铝，水中0.03％的多壁碳纳米管（MWCNT）以及在40:60的乙二醇/水中的1％金刚石）的效果不同研究了多孔材料（铜和退火热解石墨（APG））的孔隙率值。冷却剂从垂直于底座的入口通道进入，移动通过多孔介质，并通过平行于底座的两个相对的出口通道离开热交换器。还研究了泡沫填充通道的倾斜角度，入口速度值和热通量值的影响。另外，通过研究两种不同的设计来研究入口横截面的影响。一种设计具有矩形横截面入口通道（沿整个横向延伸），另一种设计具有正方形。结果表明了利用高导电性多孔材料的重要性。对于所有研究的纯水和水基纳米流体冷却剂，利用APG多孔基体可改善热交换器底部的冷却效率。结果还表明，在低孔隙率结构和高孔隙率结构中，对于铜和APG多孔基质，对于方形和矩形入口横截面，使用二氧化钛纳米流体（TiO2）作为冷却剂都可以改善基座的冷却效率和温度均匀性。对入口通道几何形状即正方形和矩形的影响的研究表明，采用正方形横截面的入口通道将导致沿流向的较低温度值，而沿横向远离中心观察到较高的温度值。 （C）2018 Elsevier Ltd.保留所有权利。

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    Zing Carlos; Mahjoob Shadi; Vafai Kambiz;

  • 作者单位

    Calif State Univ Northridge, Northridge, CA 91330 USA;

    Calif State Univ Northridge, Northridge, CA 91330 USA;

    Univ Calif Riverside, Riverside, CA 92521 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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