高效微射流阵列冷却热沉的阻力特性  

AN INVESTIGATION ON PRESSURE DROP IN A MICRO-JET IMPINGEMENT COOLING HEAT SINK

作　　者：马晓雁[1] 夏国栋[1] 刘青[1] 刘启明[1] 马重芳[1] 

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室,北京100022

出　　处：《工程热物理学报》2006年第2期259-261,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50476035)北京市自然科学基金资助项目(No.3052004)北京市教委科技发展项目(No.KM200410005008)"微射流阵列冷却热沉"专利(专利号ZL03267135.O)

摘　　要：微射流阵列冷却热沉是利用射流冲击在驻点区能产生很薄的边界层来提高换热效率,合理的布置射流孔,可以极大的提高被冷却表面温度分布的均匀性。本次研究设计的热沉是5层结构的模块式铜微射流阵列冷却热沉(微射流孔直径d=0．15 mm),以氮气和去离子水为工质对阻力特性进行了实验研究,并与微射流阵列冷却热沉的理论计算进行了比较。结果表明,在微射流热沉中,热沉的实验压降值低于计算值,热沉总阻力主要是由局部阻力引起的,占到热沉总阻力的90％。Micro-jet impingement cooling heat sink is used to cool the high power LDA owing to the very thin hydrodynamic and thermal boundary layers in the impingement region when a jet impinges on a surface. Reasonable array of jets can develop the uniform of temperature distribution on target very much. A copper micro-jet impingement cooling heat sink consisting of five copper sheets is designed in this paper and the jet diameter is 0.15 mm. Experiments are conducted to investigate pressure drop in the heat sink with water and nitrogen. The experiment results indicate that 90% pressure drop is attributed to minor drop in heat sink and these results are higher than the theoretical value.

关 键 词：热沉 射流 压降 

分 类 号：TK124[动力工程及工程热物理—工程热物理]