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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Natural convection in nanofluids: Are the thermophoresis and Brownian motion effects significant in nanofluid heat transfer enhancement?
International Journal of Thermal Sciences, Volume 57, Year 2012
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Description
Natural convection heat transfer and fluid flow of CuO-Water nanofluids is studied using the Rayleigh-Bénard problem. A two component non-homogenous equilibrium model is used for the nanofluid that incorporates the effects of Brownian motion and thermophoresis. Variable thermal conductivity and variable viscosity are taken into account in this work. Finite volume method is used to solve governing equations. Results are presented by streamlines, isotherms, nanoparticle distribution, local and mean Nusselt numbers and nanoparticle profiles at top and bottom side. Comparison of two cases as absence of Brownian and thermophoresis effects and presence of Brownian and thermophoresis effects showed that higher heat transfer is formed with the presence of Brownian and thermophoresis effect. In general, by considering the role of thermophoresis and Brownian motion, an enhancement in heat transfer is observed at any volume fraction of nanoparticles. However, the enhancement is more pronounced at low volume fraction of nanoparticles and the heat transfer decreases by increasing nanoparticle volume fraction. On the other hand, by neglecting the role of thermophoresis and Brownian motion, deterioration in heat transfer is observed and this deterioration elevates by increasing the volume fraction of nanoparticles. © 2012 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Haddad, Zoubida
Turkey, Elazig
Firat Üniversitesi
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
Abu-Nada, Eiyad A.
Saudi Arabia, Al-ahsa
King Faisal University
Öztop, Hakan Fehmi
Turkey, Elazig
Firat Üniversitesi
Mataoui, Amina
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
Statistics
Citations: 241
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.ijthermalsci.2012.01.016
ISSN:
12900729
Research Areas
Environmental