• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (24): 136-141.doi: 10.3901/JME.2016.24.136

• 可再生能源与工程热物理 • 上一篇    下一篇

新型单圆锥体热沉单孔射流散热数值模拟*

马鹏程1, 唐志国1,2, 刘轻轻2, 王元哲2   

  1. 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
  • 出版日期:2016-12-15 发布日期:2016-12-15
  • 作者简介:

    马鹏程,男,1992年出生。主要研究方向为强化换热。

    E-mail:tyfmpc@hfut.edu.cn

    唐志国(通信作者),男,1978年出生,博士,副教授。主要研究方向为强化换热、电动汽车热管理。

    E-mail:tzhiguo@hfut.edu.cn

  • 基金资助:
    * 国家科技支撑计划(2014BAG06B02)和合肥市自主创新政策 (KX201506230108)资助项目; 20160510收到初稿,20161117收到 修改稿;

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

MA Pengcheng1, TANG Zhiguo1,2, LIU Qingqing2, WANG Yuanzhe2   

  1. 1. Institute of Science and Technology, Hefei University of Technology, Hefei 230009
    , 2. School of Mechanical Engineering, Hefei University of Technology, Hefei 230009
  • Online:2016-12-15 Published:2016-12-15

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数最高;圆锥体底面直径d1和射流孔直径d比值在1~3范围内,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,数趋于最大。

关键词: 边界层, 冲击射流, 强化传热, 数值模拟, 锥体热沉

Abstract:

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 RNGk-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 theRe 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 number than the others; whend1 (diameter and conical bottom) /d (jet diameter) is 1-3, and whend1/d is about 2.5, it gets a higher value of number compared to the others; whenH (height of the jet) /d is 5, nothing about the cooling effect of heat sink is so good as thatH/d is about 5.

Key words: boundary layer, heat transfer enhancement, impinging jet, numerical simulation, cone heat sink