Numerical simulation of fluid flow and heat transfer in a microchannel heat sink with offset fan-shaped reentrant cavities in sidewall
Numerical simulation of fluid flow and heat transfer in a microchannel heat sink with offset fan-shaped reentrant cavities in sidewall
复制标题
侧壁偏置扇形凹腔微通道散热器内流体流动和传热的数值模拟
DOI：
10.1016/j.icheatmasstransfer.2010.12.037
复制
发表时间：
2011-05-01
影响因子：
7
通讯作者：
Li, Jian
中科院分区：
文献类型：
--
作者：
Chai, Lei;Xia, Guodong;Li, Jian
本文研究了一种侧壁偏置扇形再入腔的微通道散热器的流体流动和传热特性。与新型微通道散热器相比，选择了相应的传统矩形微通道散热器。采用计算流体力学方法对散热器内的流动和换热进行了模拟。用有限体积法求解了稳态、层流和传热方程。采用SIMPLEX方法进行计算。研究了流量和热流密度对压降和换热的影响。结果表明，侧壁上带有偏置扇形再入腔的微通道散热器在可接受的压降下改善了传热性能。新型微通道散热器的流体流动和换热机理可归因于传热表面积的增加、水力和热边界层的重新发展、射流和节流效应以及在重入腔上的滑动的相互作用。增大的传热表面积和周期性的热发展流是显著强化传热的原因。射流和节流效应增强了传热，同时增加了压降。再入腔的滑动减少了压降，但极大地减少了传热。(C) 2011 Elsevier Ltd.版权所有。
The paper is focused on the investigation of fluid flow and heat transfer characteristics in a microchannel heat sink with offset fan-shaped reentrant cavities in sidewall. In contrast to the new microchannel heat sink, the corresponding conventional rectangular microchannel heat sink is chosen. The computational fluid dynamics is used to simulate the flow and heat transfer in the heat sinks. The steady, laminar flow and heat transfer equations are solved in a finite-volume method. The SIMPLEX method is used for the computations. The effects of flow rate and heat flux on pressure drop and heat transfer are presented. The results indicate that the microchannel heat sink with offset fan-shaped reentrant cavities in sidewall improved heat transfer performance with an acceptable pressure drop. The fluid flow and heat transfer mechanism of the new microchannel heat sink can attribute to the interaction of the increased heat transfer surface area, the redeveloping of the hydraulic and thermal boundary layers, the jet and throttling effects and the slipping over the reentrant cavities. The increased heat transfer surface area and the periodic thermal developing flow are responsible for the significant heat transfer enhancement. The jet and throttling effects enhance heat transfer, simultaneously increasing pressure drop. The slipping over the reentrant cavities reduces pressure drop, but drastically decreases heat transfer. (C) 2011 Elsevier Ltd. All rights reserved.