Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (7): 45-49,55.doi: 10.3969/j.issn.1000-565X.2013.07.008

• Mechanical Engineering • Previous Articles     Next Articles

Experimental Investigation into Heat Transfer Performance of Micro Heat Pipe with Fiber- Composite Grooved Wick

Li Yong Chen Chun- yan Zeng Zhi- xin   

  1. School of Mechanical and Automotive Engineering∥Key Laboratory of Surface Functional Structure Manufacturing of Guangdong Higher Education Institutes,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2012-11-02 Revised:2013-03-25 Online:2013-07-25 Published:2013-06-01
  • Contact: 李勇(1974-)，男，博士，副教授，主要从事微成形及面向节能与新能源的设计与制造技术研究． E-mail:meliyong@scut.edu.cn
  • About author:李勇(1974-)，男，博士，副教授，主要从事微成形及面向节能与新能源的设计与制造技术研究．
  • Supported by:

    国家自然科学基金资助项目(51175186);广东省自然科学基金资助项目(S2011010002225);广东省科技计划项目(2012B031500004);华南理工大学中央高校基本科研业务费专项资金资助项目(2012ZZ0053)

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Abstract:

 In order to improve the heat transfer performance of micro heat pipes,a new type of micro heat pipe(GF) with capillary wick,which is made of fiber- sintered grooves with an external diameter of 8mm and an internalcavity diameter of 4.5mm,was experimentally investigated.Then,the heat transfer performance of GF2 and GF5,namely two types of GF respectively with the filling fiber length of 2 and 5 mm,was compared with that of thecomposite heat pipe (GA) fabricated by copper powder.The results show that GF is of better heat transferperformance.For instance,the wick porosities of GF2 and GF5 locally distribute and the average values respectivelyreach 71.6% and 76.3%.The maximum heat transfer power of GF2 is more than 140W,and,with an input powerof 20 ～70W,the evaporator,condenser and total thermal resistances are relatively low and keep unchanged respec-tively at about 0.04,0.03 and 0.07℃ /W.Moreover,with an input power of more than 70W,both the condenserthermal resistance and the total thermal resistance obviously increase,and the total thermal resistance of GF is stilllower than that of GA.It is also found that the evaporator temperature of heat pipe is closely related to the evapora-tor thermal resistance,and that the total thermal resistance varies in a trend similar to that of the condenser thermalresistance.

Key words: micro heat pipe, fiber, groove, thermal resistance, heat transfer performance