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首页> 外文期刊>International Journal of Heat and Mass Transfer >Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls - Part 1: Heat transfer
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Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls - Part 1: Heat transfer

机译：侧壁带扇形肋的微通道散热器层流热和水力特性的参数研究第1部分：传热

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摘要

In this first part of a three-part study, a three-dimensional numerical model has been conducted to study the heat transfer characteristics of laminar flow in microchannel heat sinks with different geometric fan-shaped ribs on sidewalls for Reynolds number ranging from 187 to 715. The numerical model considers entrance effect, conjugate heat transfer, viscous heating and temperature-dependent thermo-physical properties. The water and silicon are used as fluid and solid for the computational domain. The computations base on the finite volume method and implement the SIMPLEC algorithm. The microchannel has the width of 0.1 mm and depth of 0.2 mm in the constant cross-section region. The geometric parameters include the width (0.05-0.4 mm), height (0.005-0.025 mm) and spacing (0.2-5 mm) of aligned or offset fan-shaped ribs. The present study firstly examines the effect of fan-shaped ribs on velocity contour, temperature distribution and local heat transfer characteristics for laminar flow in such microchannel heat sinks. It is apparent that the fan-shaped ribs can effectively prevent the decline of local heat transfer coefficient along the flow direction. Secondly, the average Nusselt number and the total thermal resistance for such microchannel heat sinks have been studied. Results show that the height and spacing of fan-shaped ribs have significant influences on the heat transfer characteristics, while the width of ribs shows less. For the microchannel heat sinks with lower height and lager spacing of fan-shaped ribs, the aligned arrangement shows higher heat transfer coefficient than the offset one. For the studied Reynolds number range and geometric parameters of fan-shaped ribs, there are a 6-101% increase in average Nusselt number and a 3-40% decrease in total thermal resistance for the microchannel heat sink with aligned fan-shaped ribs, while a 4-103% increase in average Nusselt number and a 2-42% decrease in total thermal resistance for the microchannel heat sink with offset fan-shaped ribs, comparing with the smooth one. New heat transfer correlations for such microchannel heat sinks are developed, which fit the present data with a mean absolute error of 2.5% for the ones with aligned fan-shaped ribs and 3.8% for the ones with offset fan-shaped ribs.
机译：在三部分研究的第一部分中，建立了三维数值模型来研究层流在侧壁上具有不同几何扇形肋的微通道散热器的层流传热特性，雷诺数范围为187至715数值模型考虑了入口效应，共轭传热，粘性加热和温度相关的热物理性质。水和硅在计算域中用作流体和固体。计算基于有限体积法并实现SIMPLEC算法。在恒定横截面区域中，微通道的宽度为0.1毫米，深度为0.2毫米。几何参数包括对齐或偏移的扇形肋的宽度（0.05-0.4毫米），高度（0.005-0.025毫米）和间距（0.2-5毫米）。本研究首先研究了扇形肋对这种微通道散热器中层流的速度轮廓，温度分布和局部传热特性的影响。显然，扇形肋可以有效地防止局部传热系数沿流动方向的下降。其次，研究了这种微通道散热器的平均努塞尔数和总热阻。结果表明，扇形肋的高度和间距对传热特性有显着影响，而肋的宽度较小。对于具有较低高度和扇形肋的较大间距的微通道散热器，对齐的布置显示出比偏置的布置更高的传热系数。对于所研究的扇形肋的雷诺数范围和几何参数，扇形肋对齐的微通道散热器的平均Nusselt数增加了6-101％，总热阻减小了3-40％，与光滑的扇形肋相比，带有偏置扇形肋的微通道散热器的平均Nusselt数增加了4-103％，总热阻降低了2-42％。开发了用于这种微通道散热器的新的传热关联，其与当前数据相符，扇形肋对齐的平均绝对误差为2.5％，扇形肋偏置的平均绝对误差为3.8％。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2016年第6期|1069-1080|共12页
  • 作者

    Lei Chai; Guo Dong Xia; Hua Sheng Wang;

  • 作者单位

    School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;

    Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China;

    School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;

  • 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

    Microchannel heat sink; Fan-shaped ribs; Heat transfer; Thermal resistance;

    机译：微通道散热器;扇形肋;传播热量;热阻;

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