Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls - Part 3: Performance evaluation
Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls - Part 3: Performance evaluation
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DOI：
10.1016/j.ijheatmasstransfer.2016.02.075
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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
为了全面评估侧壁上具有扇形肋的微通道热沉的性能，这三部分研究的第三部分着重于热阻和泵浦功率之间的关系，并进一步的熵产生率和性能评价标准，以水和硅为计算域的流体和固体。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）。为了深入了解这种热沉的基本机制和性质，分别研究了由于传热和流体摩擦的熵产生率。结果表明，扇形肋片的综合性能较好，扇形肋片的几何参数对微通道热沉的性能有显著影响。随着肋高的增加，扇形肋偏置微通道热沉的性能逐渐优于扇形肋对齐微通道热沉。随着肋间距的减小，其综合性能先变好后逐渐变差。对于大肋高、小肋间距的微通道热沉，雷诺数的增加会导致流体摩擦熵产率的大幅增加，从而弥补了传热熵产率的下降，导致总熵产率的增加，使其综合性能比光滑微通道热沉差。在雷诺数为187 ~ 715的范围内，与光滑微通道相比，最佳微通道热沉的熵产率降低了32%，性能评价指标降低了1.33。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 order to comprehensively assess the performance of microchannel heat sink with fan-shaped ribs on sidewalls, this third part of a three-part study focuses on the relationship between thermal resistance and pumping power, and further the entropy generation rate and performance evaluation criteria, with water and silicon used as fluid and solid for the computational domain. 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. For deep insight into the basic mechanisms and properties of such heat sinks, the entropy generation rate due to heat transfer and fluid friction are separately studied. Results show that the fan-shaped ribs can lead to better comprehensive performance and the geometric parameters of fan shaped ribs have a significant influence on the performance of such microchannel heat sinks. With the increase of the rib's height, the microchannel heat sinks with offset fan-shaped ribs gradually perform better than the ones with aligned fan-shaped ribs. With the decrease of the rib's spacing, the comprehensive performance firstly becomes better and then gradually deteriorates. For the microchannel heat sink with large rib's height and small rib's spacing, the increase of Reynolds number can lead to tremendously increase of entropy generation rate due to fluid friction, which can withdraw the decrease of entropy generation rate due to heat transfer and lead to the increase of total entropy generation rate, making the comprehensive performance worse than the smooth one. For Reynolds number ranging from 187 to 715 and studied geometric parameters, the best microchannel heat sink shows a 32% decrease in entropy generation rate and 1.33 in performance evaluation criteria, comparing with the smooth one. Crown Copyright (C) 2016 Published by Elsevier Ltd. All rights reserved.