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Thermal Performance Analysis of Biporous Metal Foam Heat Sink

机译：双孔金属泡沫散热器的热性能分析

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摘要

The present study presents a concept of biporous metal foam heat sink applicable to electronic cooling. This heat sink has two metal foam layers arranged in parallel along the primary flow direction, with different metal foam thickness, porosity, and pore density for each layer. The forced convective heat transfer in biporous metal foam heat sink is numerically investigated by employing the Forchheimer-Brinkman extended Darcy momentum equation and local thermal nonequilibrium energy equation. The effects of geometrical and morphological parameters on thermal and hydraulic performance are discussed in detail, and the heat transfer enhancement mechanism of biporous metal foam is analyzed. The thermal performance of biporous metal foam heat sink is compared with that of uniform metal foam heat sink. The results show that the thermal resistance of the biporous metal foam heat sink decreases with decrease of top layer metal foam porosity at a fixed bottom metal foam porosity of 0.9. It is seen that the biporous metal foam heat sink can outperform the uniform metal foam heat sink with a proper selection of foam geometrical and morphological parameters, which is attributed to the presence of high velocity gradient at the boundary layer that can enhance the convective heat transfer. The best observed thermal performance of biporous metal foam heat sink is achieved by employing 30 pores per inch (PPI) metal foam at the bottom layer, with a fixed 50 PPI metal foam at the top layer for the porosities of both layers equal to 0.9, and the optimal thickness of the bottom foam layer is about 1 mm.
机译：本研究提出了适用于电子冷却的双孔金属泡沫散热器的概念。该散热器具有两个沿主流动方向平行排列的金属泡沫层，每一层的金属泡沫厚度，孔隙率和孔密度不同。利用Forchheimer-Brinkman扩展达西动量方程和局部热非平衡能方程，对双孔金属泡沫散热器中的强迫对流换热进行了数值研究。详细讨论了几何和形态参数对热力和水力性能的影响，并分析了双孔金属泡沫的传热增强机理。比较了双孔金属泡沫散热器和均匀金属泡沫散热器的热性能。结果表明，在固定的底部金属泡沫孔隙率为0.9的情况下，双孔金属泡沫散热器的热阻随着顶层金属泡沫孔隙的减小而降低。可以看出，通过适当选择泡沫的几何和形态参数，双孔金属泡沫散热器的性能优于均匀的金属泡沫散热器，这归因于边界层存在高速梯度，从而可以增强对流传热。通过在底层使用每英寸30个孔（PPI）的金属泡沫，在顶层使用固定的50 PPI金属泡沫，使两层的孔隙率等于0.9，可以达到双孔金属泡沫散热器最佳的热性能。底部泡沫层的最佳厚度约为1mm。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|052005.1-052005.8|共8页
  • 作者

    Liang Gong; Yongtong Li; Minghai Xu; Yogendra Joshi;

  • 作者单位

    College of Pipeline and Civil Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao 266580, China;

    College of Pipeline and Civil Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao 266580, China;

    College of Pipeline and Civil Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao 266580, China;

    The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405;

  • 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
  • 中图分类
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