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Development of Cooling Technology by Using a Very Minute Pin-Fin and a Micro-Channel

利用极微小的针翅和微通道的冷却技术的开发

基本信息

批准号：
07555384
负责人：
MOCHIZUKI Sadanari
金额：
$ 1.47万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555384/
关键词：
Rarefied Fluid Minute Heat Transfer Surface Micro-Channel Pin-Fin Transient Testing Method

项目摘要

This study has two aspects. One is to improve the conventional air-cooling technology by using very minute pin-fins although this technique suffers from thermal contact resistance. The other is to develop the next generation cooling technology by using a micro-channel. This technique has the advantage of exclusion of the thermal contact resistance.In the pin-fin heat exchanger experiments, the test core was manufactured from stainless sheet by using the etching technology. Each pin had a square cross section of which side length was 50 to 200mum. The heat transfer performance was measured by using the modified single-blow transient testing method. The heat transfer results showed the increased performance for the specific pin arrangement because of the oscillating flow behavior which was observed by the flow visualization experiments.For the micro-channel experiments, a bundle of very minute tubes was used as a test core. We used the two types of test cores made of stainless and glass tubes of which diameters were 135mum and 4mum, respectively. The pressure drop experiment was performed within the regime of the slip flow (0.01<Kn<0.1) and the transition flow (0.1<Kn<10). The measured pressure drop showed good agreement with the empirical correlation. In the heat transfer experiment, a new steady-state method setup was used. In order to calculate the heat transfer coefficient, the two-dimensional heat conduction analysis was performed by using the control volume method and the heat transfer coefficient satisfying the measured temperatures was sought in the computation. The inlet and outlet air temperatures did not give a discernible difference for the change of heat transfer coefficient because the heat transfer coefficient was very high for the present minute tubes. The numerical analysis suggested the improvement in experiment by adopting the isoflux heating condition.

本研究有两个方面。一种是通过使用非常微小的针翅来改进传统的空气冷却技术，尽管这种技术存在热接触阻力。另一个是通过使用微通道开发下一代冷却技术。在针翅式换热器的实验中，采用腐蚀工艺制作了不锈钢板芯，并对针翅式换热器的传热性能进行了测试。每个销具有边长为50至200 μ m的正方形横截面。采用改进的单吹瞬态试验法对该管的传热性能进行了测试。流动显示实验结果表明，由于流动的振荡性，特定的细针排列方式可以提高换热性能。我们使用两种类型的测试芯制成的不锈钢和玻璃管的直径分别为135 μ m和4 μ m。压降实验在滑移流（0.01<Kn<0.1）和过渡流（0.1<Kn<10）的区域内进行。实验测得的压降与经验关联式吻合较好。在传热实验中，采用了一种新的稳态法装置。为了计算传热系数，采用控制容积法进行了二维导热分析，并在计算中寻求满足实测温度的传热系数。入口和出口空气温度对传热系数的变化没有明显的差异，因为对于本发明的微小管，传热系数非常高。数值分析表明，采用等通量加热条件可以改善实验结果。