新型单圆锥体热沉单孔射流散热数值模拟  

Numerical Simulation of Characteristic of Heat Transfer for Jet Impingement with New Single Cone Heat Sink through Single Spray Nozzle

作　　者：马鹏程[1] 唐志国[1,2] 刘轻轻 王元哲[2] 

机构地区：[1]合肥工业大学科学技术研究院,合肥230009 [2]合肥工业大学机械工程学院,合肥230009

出　　处：《机械工程学报》2016年第24期136-141,共6页Journal of Mechanical Engineering

基　　金：国家科技支撑计划(2014BAG06B02);合肥市自主创新政策(KX201506230108)资助项目

摘　　要：射流冷却是高热流密度换热的有效方法之一,其热沉形状是影响换热的关键因素。提出一种新型圆锥体热沉,应用RNG k-ε湍流模型,对新型单圆锥体热沉进行单孔水冷散热数值模拟,并进行试验验证。结果表明：单圆锥体热沉的散热效果明显强于常规平板热沉,前者的射流流体域比后者多一个转折区,转折区内存在二次冲击,使换热得到强化。雷诺数越大,圆锥体热沉散热性能越优异;在不同锥角（15°~60°）的单圆锥体热沉传热模拟中,当锥角在45°左右时,热沉表面的平均努塞尔数Nu数最高;圆锥体底面直径d_1和射流孔直径d比值在1~3范围内,Nu数在比值为2.5左右达到最大值;射流高度H与射流孔直径d比值在5左右时,Nu数趋于最大。Jet cooling is one of effective ways to transfer the great flux density heat, and the heat sink shape of jet impingement is a key point affecting heat transfer. The new cone heat sink proposed is numerically simulated by using RNG k-ε turbulence model under the condition of jet impingement through a single spray nozzle and the result is verified by experiments. The result indicates that the cooling effect of heat sink with a single cone is better than that of usual flat plate heat sink, and when compared with the latter, the former has an additional transition region where is a secondary impingement which strengthens the heat transfer. The greater the Re number becomes, the better effect of the cone heat sink will be; the numerical simulation about different cone angle（15°-60°） of heat sinks shows that 45° cone angle of heat sink provides a higher value of Nu number than the others; when d_1（diameter and conical bottom） /d（jet diameter） is 1-3, and when d_1/d is about 2.5, it gets a higher value of Nu number compared to the others; when H（height of the jet） /d is 5, nothing about the cooling effect of heat sink is so good as that H/d is about 5.

关 键 词：锥体热沉 冲击射流 强化传热 数值模拟 边界层 

分 类 号：TK124[动力工程及工程热物理—工程热物理]