Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Imprimir: 1940-2503
ISSN On-line: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.v1.i4.40
pages 425-440

NATURAL CONVECTION OF NANOFLUIDS IN A CAVITY INCLUDING THE SORET EFFECT

Rachid Bennacer
L2MGC F-95000, University of Cergy-Pontoise, 95031 Cergy-Pontoise Cedex, Paris, France; ENS-Cachan Dpt GC/LMT/CNRS UMR 8535, 61 Ave. du Président Wilson, 94235 Cachan Cedex, France; Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, 300134
Mohammed El Ganaoui
Sciences des Procedes Ceramiques et des Traitements de Surface (SPCTS), UMR CNRS 6638, Faculte des Sciences de Limoges 123, av. A. Thomas - 87060 Limoges Cedex
Thierry Mare
INSA de Rennes, LGCGM, IUT Saint Malo, France
Cong Tam Nguyen
Faculty of Engineering, Universite de Moncton, Moncton, New Brunswick, Canada E1A 3E9

RESUMO

Convection of a binary mixture in a cavity is studied numerically. The flow is driven by a buoyancy force due to an externally applied constant temperature difference on the vertical wall of the cavity, while the horizontal surfaces are impermeable and adiabatic. A nanofluid is used and the effects of the cross phenomenon "Soret effect" were considered in the analysis. The flows are found to be dependent on the particle concentration φ, the Rayleigh number RaT, the Lewis number Le, the solutal to thermal buoyancy ratio N, and the thermal boundary conditions. Numerical results for finite amplitude convection, obtained by solving numerically the full governing equations, are found to be in good agreement with the analytical solution based on the scale analysis approach. We have proposed a modified formulation of the conservation equations governing the flow and heat transfer of nanofluids, taking into account important changes of nanofluid thermal conductivity and viscosity as well as the spatial change of the particle concentration that is induced by the Soret effect. Results have shown that such an effect increases nanofluid heat transfer. The optimal particle volume concentration, which maximizes heat transfer, is estimated to be 2%. The increase of natural convection with nanoparticle concentration is weak in comparison to that found in forced convection.


Articles with similar content:

NATURAL CONVECTION AND HEAT TRANSFER OF NANOFLUIDS CONSIDERING THE SORET EFFECT
ICHMT DIGITAL LIBRARY ONLINE, Vol.13, 2008, issue
T. Nguyen, Thierry Mare
DOUBLE DIFFUSIVE NATURAL CONVECTION IN A SQUARE ENCLOSURE FILLED WITH COPPER-WATER NANOFLUID INDUCED BY OPPOSITE TEMPERATURE AND CONCENTRATION GRADIENTS
Computational Thermal Sciences: An International Journal, Vol.10, 2018, issue 4
Natesan Saritha, A. Senthil Kumar
Mixed Convection of Water-Based Nanofluids in a Lid-Driven Square Enclosure with a Heat Source
Heat Transfer Research, Vol.42, 2011, issue 8
Kamil Kahveci, Elif Buyuk Ogut
INVESTIGATION OF THE EFFECT OF BROWNIAN MOTION ON THE FLOW CHARACTERISTIC IN NATURAL CONVECTION USING DIFFERENT NANOFLUIDS
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2017, issue
Ahmed Ramadan, Reaz Hasan, Noel Perera, Saleh Etaig
NATURAL CONVECTION OF MICROPOLAR NANOFLUIDS IN A RECTANGULAR ENCLOSURE SATURATED WITH ANISOTROPIC POROUS MEDIA
Journal of Porous Media, Vol.19, 2016, issue 8
Sameh Elsayed Ahmed, Ahmed M. Rashad