Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (1): 123-128.doi: 10.3969/j.issn.1000-565X.2017.01.018

• Mechanical Engineering • Previous Articles     Next Articles

Analysis of Heat Transfer Channel Surface Characteristic of Micro Heat Exchanger Based on Young's Theory

ZHOU Jian-yang1 LUO Xiao-ping1 FENG Zhen-fei1,2 DENG Cong1 WU Di1   

  1. 1.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,Guangxi,China
  • Received:2016-01-18 Revised:2016-09-14 Online:2017-01-25 Published:2016-12-01
  • Contact: 周建阳( 1986-) ，男，博士生，讲师，主要从事微尺度相变传热研究． E-mail:369398611@qq.com
  • About author:周建阳( 1986-) ，男，博士生，讲师，主要从事微尺度相变传热研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China( 21276090)

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Abstract:

The surface characteristic of the heat transfer channel of micro heat exchangers has a significant effect on the flow boiling performance of fluid.Solid surface energy is often used to describe the surface characteristics of the heat transfer channel,which can provide a theoretical basis for the research of the flow boiling performance of the fluid in micro-channels.In the investigation,the contact angles of deionized water,ethylene glycol and formamide with the left,right and bottom surfaces of the heat transfer channel were measured respectively,and the solid surface energy of the heat transfer channel was calculated on the basis of Young's theory.Then,the forming mechanism of the contact angle difference between the inside and outside surfaces of the micro-channels was analyzed through the Wenzel model of droplet.The results show that the solid surface energy of the left,right and bottom surfaces of the heat transfer channel are respectively 5.2,5.6 and 8.2MJ /m2,and the surface roughness difference causes the inside surface features to be different.

Key words: micro heat exchanger, surface characteristic, surface energy, Young's theory, Wenzel droplet model

CLC Number: