Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (2): 39-43.doi: 10.3969/j.issn.1000-565X.2014.02.007

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Effective Thermal Conductivity of Graphite- Based Microfluids

Cui Guo- gen1 Yang Xiao- xi2 Ding Jing3 Yang Jian- ping1   

  1. 1.Key Laboratory of Heat Transfer Enhancement and Energy Conservation of the Ministry of Education,South ChinaUniversity of Technology,Guangzhou 510640,Guangdong,China; 2.Department of Energy and Chemical Engineering,Dongguan University of Technology,Dongguan 523106,Guangdong,China; 3.School of Engineering,Sun Yat- Sen University,Guangzhou 510275,Guangdong,China
  • Received:2013-09-10 Revised:2013-11-20 Online:2014-02-25 Published:2014-01-02
  • Contact: 崔国根(1974-)，男，博士生，主要从事传热传质和节能技术研究． E-mail:cgg-111@163.com
  • About author:崔国根(1974-)，男，博士生，主要从事传热传质和节能技术研究．
  • Supported by:

    国家 “973” 计划项目(2010CB227103);国家自然科学基金资助项目(51176036);广东省教育厅科技创新重点项目(cxzd1148);东莞市重点项目(2012108101005)

PDF

707

Abstract:

Graphite- based microfluids were prepared via the one- step chemical method,and the effective thermalconductivity of the microfluids was measured by means of the transient hot wire method under the conditions of dif-ferent graphite contents,different ultrasonic time,different microwave time and base fluids.The results show that(1) the addition of graphite in the base fluids greatly improves the effective thermal conductivity of the microfluids;(2) the effective thermal conductivity of microfluids increases with the increase of the graphite content; (3) the ef-fective thermal conductivities of graphite- based microfluids in three base fluids (DI water,ethylene glycol and dim-ethicone) respectively increase by 102． 09%,93.17% and 225.69% at the graphite content of 1. 0%; (4) at thesame graphite content,the same ultrasonic time and microwave time,dimethicone may result in the largest effectivethermal conductivity increment while DI water may result in the smallest one; and (5) with the prolonging of ultra-sonic time and microwave time,the increment of effective thermal conductivity of graphite- based microfluids signifi-cantly reduces.

Key words: graphite, microfluid, effective thermal conductivity, one- step chemical method, transient hot wiremethod

CLC Number: