带冲击射流的柱肋结构通道热沉的数值模拟研究

Numerical Investigation of a Hybrid Heat Sink With Jet Impingement and Mini Pillars

针对微通道冷却和冲击射流冷却方式的不足,设计了一种新的带冲击射流的柱肋结构的通道热沉,通过数值模拟的方式研究其流动特性和换热性能,模拟工况为加热热流密度为400W/cm^2,进口总压从3.5～12.5 kPa,出口静压为500 Pa,工质为水,热沉的材料为铜,进口温度为300 K。模拟计算结果表明,该结构具有较高的换热效果和良好的表面温度均匀性,在进口总压为3.5 kPa时,表面的最高温度不超过380 K,加热面最高温度和最低温度的差值约为12 K;而当进口总压为12.5 kPa时,最高温度和温差值分别为368 K和约5 K。在进口总压为3.5～12.5 kPa,所研究结构的热沉的流量为3.03～6.32 g/s。

A new structure heat sink is designed to get better heat transfer performance. It is a hybrid of jet impingement, column and mini channel cooling scheme. Numerical simulations are used to explore the three-dimensional flow characteristics and heat transfer performance by standard k-ε turbulent model. The heat sink is copper and the cooling liquid is water. The temperature at inlets is 300 K and the heat flux is 400 W/cm^2. The results show that higher inlet pressure will improve the mass flux and reduce bottom temperature, as well as the difference between highest temperature and the lowest temperature of the heated surface. The flow mass rate is 0.00632 kg/s as the inlet pressure is 12.5 kPa. The highest temperature of the heat surface is below 368 K and the difference was 5 K.