Laminar flow and heat transfer characteristics of interrupted microchannel heat sink with ribs in the transverse microchambers
Laminar flow and heat transfer characteristics of interrupted microchannel heat sink with ribs in the transverse microchambers
复制标题
横向微腔肋间断微通道散热器层流及传热特性
DOI：
10.1016/j.ijthermalsci.2016.06.029
复制
发表时间：
2016-12-01
影响因子：
4.5
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
本文主要研究了横向微腔带肋间断式微通道热沉内的层流流动和传热特性。基于有限体积法和SIMPLEC算法建立了考虑入口效应、共轭传热、粘性加热和温度相关热物理性质的三维模型。考虑了五种不同的肋结构，包括矩形、后三角形、菱形、前三角形和椭圆形。本文首先研究了肋片对微通道热沉内的速度场、压力场和温度场的影响，进而研究了肋片对微通道热沉内的局部压降和换热特性的影响。结果表明，横向微腔中的肋片可以有效地防止局部换热系数沿着流动方向的下降。其次，研究了微通道热沉的平均摩擦因数和努塞尔数。结果表明，在雷诺数为187 ~ 715的范围内，与直微通道热沉相比，带肋间断微通道热沉的努塞尔数增加了24-57%，而摩擦系数增加了3- 70%.最后，基于性能评价标准，对微通道热沉的性能进行了综合评价。结果表明，在本文研究的雷诺数范围和微通道几何形状下，横向微腔中带有椭圆肋的间断式微通道热沉具有最佳的传热性能，其性能评价标准最大值为1.39。(C)2016 Elsevier Masson SAS。All rights reserved.
The paper is focused on the investigation of the laminar flow and heat transfer characteristics in the interrupted microchannel heat sink with ribs in the transverse microchambers. A three-dimensional model based on finite volume approach and SIMPLEC algorithm is performed considering entrance effect, conjugate heat transfer, viscous heating and temperature-dependent thermo-physical properties. Five different rib configurations are considered, including rectangular, backward triangular, diamond, forward triangular and ellipsoidal. The present study firstly examines the effect of such ribs on velocity contour, pressure distribution and temperature distribution, further the local pressure drop and heat transfer characteristics in such microchannel heat sinks. Result shows that the ribs in the transverse microchambers can effectively prevent the decline of local heat transfer coefficient along the flow direction. Secondly, the average friction factor and Nusselt number for such microchannel heat sinks have been studied. Results show that for Reynolds number ranging from 187 to 715, there is a 24-57% increase in the Nusselt number for the interrupted microchannel heat sinks with ribs, while the friction factor increased by 3-70%, comparing with the straight microchannel heat sink. Finally, based on the performance evaluation criteria, the performance of such microchannel heat sink has been comprehensively evaluated. Results shows that for the studied Reynolds number range and microchannel geometries in this paper, the interrupted microchannel heat sink with ellipsoidal ribs in the transverse microchambers shows the best heat transfer performance, with maximum 1.39 of performance evaluation criteria. (C) 2016 Elsevier Masson SAS. All rights reserved.