北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (7): 1253-1258.doi: 10.13700/j.bh.1001-5965.2014.0524

• 论文 • 上一篇    下一篇

宽高比对微小通道空气流动换热特性影响实验

刘阳鹏, 徐国强, 李海旺, 田一土   

  1. 北京航空航天大学 航空发动机气动热力重点实验室, 北京 100191
  • 收稿日期:2014-08-25 修回日期:2014-10-27 出版日期:2015-07-20 发布日期:2015-07-30
  • 通讯作者: 李海旺(1982—),男,河北唐山人,副教授,09620@buaa.edu.cn,主要研究方向为高温旋转部件的流动与换热. E-mail:09620@buaa.edu.cn
  • 作者简介:刘阳鹏(1987—),男,山西长治人,博士研究生,282927365@qq.com
  • 基金资助:
    中央高校基本科研业务费专项资金(YWF-14-DLXY-021)

Experiment of air flow behavior and heat transfer characteristics in microchannels with different aspect ratios

LIU Yangpeng, XU Guoqiang, LI Haiwang, TIAN Yitu   

  1. National Key Laboratory of Science and Technology on Aero-Engines, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-08-25 Revised:2014-10-27 Online:2015-07-20 Published:2015-07-30

摘要: 针对不同宽高比微小矩形通道内流动和换热特性进行了实验研究.微小矩形通道宽0.4mm,宽高比分别为2/5、1/2、2/3和1.实验以空气作为工质.流动雷诺数Re范围是200~1600.实验结果表明:宽高比对微小矩形通道流动换热特性的影响不可忽略.微小矩形通道摩擦因子随着Re增大而减小,泊肃叶数Po随着Re增大而增大,二者随着宽高比增大同时减小;努塞尔数Nu随着Re增大而增大,随着宽高比增大而减小.针对宽高比对微小矩形通道流动换热特性的影响拟合了相应经验关系式.

关键词: 微小通道, 宽高比, 流动, 换热, 经验关系式

Abstract: Experiments were conducted to investigate the flow behavior and heat transfer characteristics in minichannels with different aspect ratios. The widths of microchannels are constant of 0.4mm. The aspect ratiosof the microchannels are 2/5, 1/2, 2/3 and 1, respectively. All tests were performed with air. The experiments were completed with the Reynolds number in the range of 200 to 1600. Results of experiments show that the aspect ratios of microchannels have a remarkable effect on the performance of flow behavior and heat transfer characteristics. The friction factors decrease with the increase of the Reynolds numbers. The Poiseuille numbers increase when the Reynolds numbers keep rising. Both of the friction factors and Poiseuille numbers drop as the aspect ratios increase. Nusselt numbers increase as Reynolds numbers increase, but decrease with the increase of aspect ratios. The corresponding empiric equations for the flow resistance and heat transfer characteristics in microchannels with different aspect ratios are fitted.

Key words: microchannels, aspect ratio, flow, heat transfer, empiric equations

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