Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (8): 16-19.

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Flow Resistance Characteristics in Heat Exchange Tubes Enhanced with LVGs

Yang Ze-liang1  Luo Fu-sheng1  Li Yan2  Yang Cheng1   

  1. 1.College of Electric Power,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;2.Dept.of Machine and Electron,Zhongkai Agrotechnical College,Guangzhou 510225,Guangdong,China
  • Received:2005-02-24 Online:2005-08-25 Published:2005-08-25
  • Contact: 杨泽亮(1947-)，男，教授，主要从事传热与燃烧研究． E-mail:mpzlyang@scut.edu.cn
  • About author:杨泽亮(1947-)，男，教授，主要从事传热与燃烧研究．
  • Supported by:

    国家重点基础研究发展计划项目(G20000263)

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Abstract:

In order to study the flow resistance characteristics in the heat exchange tubes enhanced with longitudinal vortex generators(LVGs),the influences of various parameters,such as the Reynolds number inside the tubes,the installation position as well as the height of LVGs and the distance between LVGs.flow resistance were investigated by theoretical analysis and experimental studies.Fitting forlTlulas of the flow resistance were then deduced.Moreo-ver,a graphical comparison was carried out,thus obtaining the corresponding action rules and pressure drop cha-racteristics of the heat exchange.The results show that:(1)the flow resistance coefficient is linear with the dis-tance between LVGs under the same Reynolds number;(2)with the same distance between LVGs,the heat ex-change will be greatly enhanced by the height of LVGs in the case of larger Reynolds number;and(3)a distance between LVGs which is less than the affecting distance of LVGs is not desirable for the heat exchange enhancement.

Key words: longitudinal vortex generator, heat exchange enhancement, flow resistance characteristic