Experimental investigation of header shape and inlet configuration on flow maldistribution in microchannel
Experimental investigation of header shape and inlet configuration on flow maldistribution in microchannel
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DOI：
10.1016/j.expthermflusci.2016.02.004
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发表时间：
2016-07
影响因子：
3.2
通讯作者：
C. Anbumeenakshi;M. Thansekhar
中科院分区：
文献类型：
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作者：
C. Anbumeenakshi;M. Thansekhar
以去离子水为冷却剂，在雷诺数为200 ~ 650的范围内，对25个水力直径为763 μm的矩形微通道的铝微通道热沉进行了详细的实验研究。本实验研究的主要焦点是寻找集管形状与流量入口结构的适当组合，以减少流量分配不均的影响。实验中采用了矩形、梯形和三角形三种集箱形状以及两种进气结构，即垂直流进气结构和直列流进气结构。结果表明，垂直流进气道结构比直列流进气道结构具有更小的气流分布不均匀性。梯形和三角形集箱在低流量时流量分配不均较小，而矩形集箱在高流量时流量分配不均较小。随着流速的增加，不均匀分布减少。在一般情况下，它被发现，在微通道中的流量分配显着依赖于流入口配置，头部形状和流量。
A detailed experimental investigation has been carried out to analyze the flow maldistribution in a microchannel heat sink by using deionized water as the coolant in an aluminum microchannel heat sink with 25 numbers of rectangular microchannels of hydraulic diameter 763 μm, for Reynolds number range of 200–650. The prime focus of this experimental study is to find the suitable combination of header shape and flow inlet configuration to minimize the flow maldistribution effect. Experiments have been carried out with three types of header shapes rectangular, trapezoidal and triangular and two types of inlet configurations viz. vertical flow inlet configuration and inline flow inlet configuration. It is found that vertical flow inlet configuration gives less maldistribution than inline flow inlet configuration. Trapezoidal and triangular headers give less flow maldistribution at low flow rate while rectangular header gives less flow maldistribution at higher flow rates. As the flow rate increases maldistribution decreases. In general, it is found that flow distribution in the microchannel significantly depends on flow inlet configuration, header shape and flow rate.