Effect of multipolar interaction on the effective thermal conductivity of nanofluids |
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| Authors: | Zhou Xiao-Feng and Gao Lei |
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| Affiliation: | Yancheng Institute of Technology, Yancheng 224003, China; Department of Physics, Suzhou University, Suzhou 215006, China |
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| 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热传导率 多极化 物理 相互作用nanofluids, thermal conductivity, multipolar interactionProject supported by the National Natural Science Foundation of China
(Grant No~10204017) and the Natural Science of Jiangsu
Province, China (Grant No~BK2002038).2006-07-062006-08-21Nanofluids 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 polnt-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 Al2O3/water nanofluids are in good agreement with experimental data. |
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| Keywords: | nanofluids thermal conductivity multipolar interaction |
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