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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 651365, 7 pages
http://dx.doi.org/10.1155/2013/651365
Research Article

CFD Study on Wall/Nanoparticle Interaction in Nanofluids Convective Heat Transfer

1Iranian Academic Center for Education, Culture and Research, Branch of Science & Technology University (JDEVS), Tehran 1981983889, Iran
2Department of Mechanical Engineering, Islamic Azad University, Shahre-Rey Branch, Tehran 144-18155, Iran
3Department of Chemical Engineering, Islamic Azad University, Center Tehran Branch, Tehran, Iran

Received 20 May 2013; Revised 31 July 2013; Accepted 24 September 2013

Academic Editor: Alessandro Massaro

Copyright © 2013 Mohammad Reza Tarybakhsh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Brownian motion of the nanoparticles in nanofluid is one of the potential contributors to enhance effective thermal conductivity and the mechanisms that might contribute to this enhancement are the subject of considerable discussion and debate. In this paper, the mixing effect of the base fluid in the immediate vicinity of the nanoparticles caused by the Brownian motion was analyzed, modeled, and compared with existing experimental data available in the literature. CFD was developed to study the effect of wall/nanoparticle interaction on forced convective heat transfer in a tube under constant wall temperature condition. The results showed that the motion of the particle near the wall which can decrease boundary layer and the hydrodynamics effects associated with the Brownian motion have a significant effect on the convection heat transfer of nanofluid.