空气射流冷却圆锥热沉的传热特性分析  

Analysis of heat transfer characteristics of an air jet cooling a conical heat sink

作　　者：李海 唐志国[1] 高钦 张峰 宋安琪 LI Hai;TANG Zhiguo;GAO Qing;ZHANG Feng;SONG Anqi(School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学机械工程学院,安徽合肥230009

出　　处：《中国科学技术大学学报》2020年第5期551-558,共8页JUSTC

基　　金：国家自然科学基金(51006031)资助.

摘　　要：采用数值模拟的方法,选择Transition SST湍流模型求解Navier-Stokes方程,研究了空气单孔射流冷却不同夹角圆锥体热沉的传热特性,结合流动特点分析了不同位置的传热差异.结果表明:引入圆锥凸起,极大强化了驻点附近的传热效果;小夹角圆锥热沉的平均换热性能比平板热沉好,且夹角越小,传热强化效果越好.在圆锥底部边缘,先后出现流动分离和二次射流,导致传热被先削弱后增强.The heat transfer characteristics of a single air jet to cool conical heat sinks with different conical angles were studied by numerical simulation.The Transition SST turbulence model was adopted to solve the Navier-Stokes equation.The difference of heat transfer between different locations was analyzed in combination with flow characteristics.The results show that introducing a conical protrusion greatly enhances the heat transfer near the stagnation point.The average heat transfer performances of cone heat sinks with small angles are better than that of flat heat sinks.And the smaller the angle,the better the heat transfer enhancement.At the bottom edge of the cone,the heat transfer has been weakened first and then enhanced,which is caused by flow separation and secondary jet respectively.

关 键 词：圆锥热沉 射流冷却 二次射流 强化传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]