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Chinese Physics, 2007, Vol. 16(7): 2028-2032    DOI: 10.1088/1009-1963/16/7/037
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

Effect of multipolar interaction on the effective thermal conductivity of nanofluids

Zhou Xiao-Feng(周晓锋)a) and Gao Lei(高雷)b)
a Yancheng Institute of Technology, Yancheng 224003, China; b Department of Physics, Suzhou University, Suzhou 215006, China
Abstract  Nanofluids or liquids with suspended nanoparticles are likely to be the future heat transfer media, as they exhibit higher thermal conductivity than those of liquids. It has been proposed that nanoparticles are apt to congregate and form clusters, and hence the interaction between nanoparticles becomes important. In this paper, by taking into account the interaction between nearest-neighbour inclusions, we adopt the multiple image method to investigate the effective thermal conductivity of nanofluids. Numerical results show that then the thermal conductivity ratio between the nanoparticles and fluids is large, and the two nanoparticles are close up and even touch, and the point-dipole theory such as Maxwell--Garnett theory becomes rough as many-body interactions are neglected. Our theoretical results on the effective thermal conductivity of CuO/water and Al$_{2}$O$_{3}$/water nanofluids are in good agreement with experimental data.
Keywords:  nanofluids      thermal conductivity      multipolar interaction  
Received:  06 July 2006      Revised:  21 August 2006      Accepted manuscript online: 
PACS:  66.25.+g (Thermal conduction in nonmetallic liquids)  
  61.46.Df (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))  
  82.70.Kj (Emulsions and suspensions)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No~10204017) and the Natural Science of Jiangsu Province, China (Grant No~BK2002038).

Cite this article: 

Zhou Xiao-Feng(周晓锋) and Gao Lei(高雷) Effect of multipolar interaction on the effective thermal conductivity of nanofluids 2007 Chinese Physics 16 2028

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