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Experimental investigations on liquid flow and heat transfer in rectangular microchannel with longitudinal vortex generators

机译:带有纵向涡流发生器的矩形微通道内液体流动和传热的实验研究

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摘要

The behaviors of improved Heat transfer and the associated higher pressure drop for liquid flow in rectangular micochannels with longitudinal vortex generators (LVGs) were determined experimentally for the Reynolds numbers of 170-1200 with hydraulic diameter of 187.5 um and aspect ratio of 0.067 for LVGs with different number of pairs and angles of attack. It was found that the range of critical Reynolds numbers (600-730) were at a much smaller value by adding LVGs than the one without (Re ~ 2300); heat transfer performance was improved (9-21% higher for those with laminar flow and 39-90% for those with turbulent flow), while encountering larger pressure drop (34-83% for laminar flow and 61-169% for turbulent flow). Empirical correlations for these two parameters were then obtained by curve-fittings for a variety of rectangular microchannels under study.
机译:对于具有纵向涡流发生器(LVG)的矩形微通道中的液体流动,改进的传热行为和相关的较高的压降是通过实验确定的,其中雷诺数为170-1200,水力直径为187.5 um,长径比为0.067,对于具有对数和攻角不同。发现通过添加LVG,比没有雷诺数(Re〜2300)的雷诺数临界范围(600-730)小得多。传热性能得到改善(层流流体的传热性能提高了9-21%,湍流流体的传热性能提高了39-90%),同时遇到了更大的压降(层流流体为34-83%,湍流流体为61-169%) 。然后,通过对各种矩形微通道进行曲线拟合,获得了这两个参数的经验相关性。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第14期|p.3069-3080|共12页
  • 作者单位

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China,Department of Mechanical Engineering, Chung Yuan Christian University, 32023, Taiwan;

    Department of Mechanical Engineering, Chung Yuan Christian University, 32023, Taiwan;

    Department of Mechanical Engineering, Chung Yuan Christian University, 32023, Taiwan;

    Department of Mechanical Engineering, Chung Yuan Christian University, 32023, Taiwan;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    Department of Heat and Refrigeration Technology, Hochiminh City University of Technical Education, Hochiminh City, Viet Nam;

    Department of Mechanical Engineering, University of California at Berkeley, CA 94720, USA;

    Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsin-Chu 31040, Taiwan;

  • 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
  • 关键词

    heat transfer friction factor rectangular microchannels longitudinal vortex generators;

    机译:传热摩擦系数矩形微通道纵向涡发生器;

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