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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2013007127
pages 409-432

EFFECT OF NANOFLUID VARIABLE PROPERTIES ON MIXED CONVECTION FLOW AND HEAT TRANSFER IN AN INCLINED TWO-SIDED LID-DRIVEN CAVITY WITH SINUSOIDAL HEATING ON SIDEWALLS

Mohammad Hemmat Esfe
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Mohammad Akbari
Department of Mechanical Engineering, Semnan University, Semnan, Iran
Davood Semiromi Toghraie
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
Arash Karimipour
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran
Masoud Afrand
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

SINOPSIS

In this study, mixed convection fluid flow and heat transfer in an inclined two-sided lid-driven cavity subjected to Al2O3−water nanofluid (with different particle diameters from 15 to 99 nm) has been investigated numerically. The geometry is a double lid-driven square cavity with sinusoidal temperature distribution on the left sidewall, while the right wall is kept at Tc. The top and bottom walls of the cavity, which move in opposite directions, are assumed to be insulated. The effects of inclination angle, Richardson number, nanoparticle volume fraction, temperature, and nanoparticle diameter based on recent variable property formulations are studied. The effects of an increase in Richardson number while the solid volume fraction is constant and effects of an increase in solid volume fraction when the Richardson number is kept constant are investigated. Also, the obtained results show that an increase in nanoparticle diameter influences the flow pattern and isotherm contours inside the cavity relatively when the Richardson number is kept constant and the diameter is varied from 15 to 99 nm. As the mean nanoparticle diameter increases, the corresponding flow velocity decreases, and hence the heat transfer enhancement is reduced. The results indicate that as Richardson number increases, the average Nusselt number rapidly increases for different values of dp. Moreover, the results have clearly indicated that the addition of Al2O3 nanoparticles has produced a remarkable enhancement on heat transfer with respect to that of the pure fluid.


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