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

ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2017019908
pages 405-421

BUOYANCY-DRIVEN HEAT TRANSFER ENHANCEMENT IN A SINUSOIDALLY HEATED ENCLOSURE UTILIZING HYBRID NANOFLUID

Tahar Tayebi
Energy Physics Laboratory, Department of Physics, Faculty of Exact Sciences, Frères Mentouri Constantine 1 University, Algeria; Department of Mechanical Engineering, Faculty of Sciences and Technology, Mohamed El Bachir El Ibrahimi University, Bordj Bou Arreridj, El-Anasser, Algeria
Ali J. Chamkha
Mechanical Engineering Department, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Saudi Arabia; RAK Research and Innovation Center, American University of Ras Al Khaimah, P.O. Box 10021, Ras Al Khaimah, United Arab Emirates

RÉSUMÉ

The purpose of this work is to study numerically heat transfer and fluid flow characteristics by natural convection in an enclosure filled with Al2O3/water nanofluid and Cu-Al2O3/water hybrid nanofluid including pure water. The left sidewall of the cavity is heated by a nonuniform surface temperature, while the right wall is kept isothermally cooled. The basic equations that govern the problem (continuity, momentum, and energy) are formulated in terms of the vorticity-stream function equations using the dimensionless form for two-dimensional, laminar and incompressible flow under steady-state conditions. Those equations are discretized via the finite volume method and solved by a FORTRAN computer program. The thermophysical properties of the nanofluid and the hybrid nanofluid are calculated in terms of the volume fraction of nanoparticles and combined nanoparticles. A numerical study is performed for an enclosure filled with regular water, Al2O3/water nanofluid, and Cu-Al2O3/water hybrid nanofluid for various volume fractions of nanoparticles and hybrid nanoparticles (0 ≤ φ ≤ 0.12) and Rayleigh number (103 ≤ Ra ≤ 105). The results of the study are presented in the form of streamlines, isotherm contours, and distribution of the local and average Nusselt numbers on the heated wall. The main result we obtained is that the use of Cu-Al2O3/water hybrid nanofluid offers better thermal and dynamic performance compared to the similar Al2O3/water nanofluid.


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