Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls - Part 1: Heat 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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DOI：
10.1016/j.ijheatmasstransfer.2016.02.077
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发表时间：
2016-06-01
影响因子：
5.2
通讯作者：
Wang, Hua Sheng
中科院分区：
文献类型：
--
作者：
Chai, Lei;Xia, Guo Dong;Wang, Hua Sheng
在这三部分研究的第一部分中，已经进行了三维数值模型，以研究层流在不同的几何形状的扇形肋的侧壁上的微通道散热器的雷诺数范围从187到715的传热特性。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。水和硅被用作计算域的流体和固体。计算基于有限体积法，实现了SIMPLEC算法。微通道在恒定横截面区域中具有0.1mm的宽度和0.2mm的深度。几何参数包括对齐或偏移的扇形肋的宽度（0.05- 0.4mm）、高度（0.005- 0.025mm）和间距（0.2-5 mm）。本文首先研究了扇形肋片对微通道热沉层流流动的速度场、温度场和局部换热特性的影响。显然，扇形肋片可以有效地防止局部传热系数沿着流动方向下降。其次，研究了微通道热沉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微通道热沉的换热特性有显著影响，而宽度的影响较小;对于高度较低、间距较大的微通道热沉，扇形肋排列方式的换热系数要高于扇形肋错位方式。在所研究的雷诺数范围和扇形肋的几何参数下，扇形肋排列的微通道热沉的平均努塞尔数增加了6-101%，总热阻降低了3-40%，而对于具有偏置风扇的微通道散热器，平均努塞尔数增加4-103%，总热阻降低2-42%。与光滑的肋骨相比，开发了新的微通道散热器的传热关联式，它适合目前的数据与对齐的扇形肋的平均绝对误差为2.5%，与偏移扇形肋的3.8%。皇冠版权所有（C）2016由爱思唯尔有限公司出版。保留所有权利。
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. Crown Copyright (C) 2016 Published by Elsevier Ltd. All rights reserved.