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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2013006652
pages 289-301

NATURAL CONVECTION OF NANOFLUIDS IN A SQUARE CAVITY HEATED FROM BELOW

Harold Noriega
Ecole Polytechnique, Universite de Montreal, C.P. 6079, Succ. Centre Ville, Montreal, Quebec, Canada, H3C 3A7
Marcelo Reggio
Ecole Polytechnique, Universite de Montreal, C.P. 6079, Succ. Centre Ville, Montreal, Quebec, Canada, H3C 3A7
Patrick Vasseur
Ecole Polytechnique, Université de Montréal, C.P. 6079, Succ. "Centre ville", Montréal, Québec H3C 3A7, Canada

ABSTRACT

This paper reports a numerical study of natural convection in a square cavity filled with a copper-water nanofluid. The simulations are conducted following the lattice Boltzmann approach. The lower and upper horizontal walls of the cavity are heated and cooled isothermally, respectively; the vertical ones are insulated. The thermal conductivity of the nanofluid is modeled according to Maxwell-Garnett (Philos. Trans. R. Soc., vol. A23, pp. 385−420,1904) and Koo and Kleinstreuer (J. Nanopart. Res., vol. 6, pp. 577−588, 2004), respectively. The governing parameters for the problem are the thermal Rayleigh number, the Prandtl number, and the solid volume fraction of nanoparticles. Numerical solutions of the governing equations, based on the lattice Boltzmann method, are obtained for a wide range of the governing parameters. Results are presented in the form of streamlines, isotherms, and Nusselt numbers. The influence of the two models considered here, to predict the thermal conductivity of a nanofluid, on the onset of motion, onset of oscillatory flow, and convective heat transfer, is discussed.


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