Effect of clustering on the thermal conductivity of nanofluids

被引：246

作者：

Karthikeyan, N. R. ^{[1
]}

Philip, John ^{[1
]}

Raj, Baldev ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Met & Mat Grp, Kalpakkam 603102, Tamil Nadu, India

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2008年 / 109卷 / 01期

关键词：

CuO nanoparticles; nanofluid; thermal properties; heat transfer fluid;

D O I：

10.1016/j.matchemphys.2007.10.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We synthesis CuO nanoparticles of average diameter 8 nm by a simple precipitation technique and study the thermal properties of the suspensions. The thermal conductivity enhancement observed in water and ethylene glycol based nanofluids with 1 vol.% CuO nanoparticles loading are 31.6 and 54%, respectively. The large enhancement in thermal conductivity is attributed to the finer particle size and monodispersity of nanoparticles. It has been found that the thermal conductivity of the nanofluid increases nonlinearly with the volume fraction of nanoparticles. The time-dependent thermal conductivity in water based CuO nanofluid shows that the thermal conductivity decreases with elapsed time due to clustering of nanoparticles with time, as confirmed microscopically. The experimental results show that the nanoparticles size, polydispersity, cluster size and the volume fraction of particles have a significant influence on thermal conductivity. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：50 / 55

页数：6

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