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Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure

H., Saleh and R., Roslan and I. , Hashim (2011) Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure. International Journal of Heat and Mass Transfer, 54. ISSN 00179310

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Heat transfer enhancement utilizing nanofluids in a trapezoidal enclosure is investigated for various pertinent parameters. Transport equations are modelled by a stream-vorticity formulation and solved numerically by finite difference approach. The inclined sloping boundaries is treated by adopting staircase-like zigzag lines. Based upon the numerical predictions, the effects of Grashof number, inclination angle of the sloping wall, volume fraction of nanoparticles on flow and temperature patterns as well as the heat transfer rate within the enclosure are presented. Water–Cu and water–Al2O3 nanofluids were tested. We found that acute sloping wall and Cu nanoparticles with high concentration are effective to enhance the rate of heat transfer. We also developed a new correlation for the average Nusselt number as a function of the angle of the sloping wall, effective thermal conductivity and viscosity as well as Grashof number.

Item Type: Article
Uncontrolled Keywords: nanofluids; natural convection; trapezoidal enclosure
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Applied Science and Technology > Department of Science and Mathematics
Depositing User: En. Muhamad Saufi Che Rusuli
Date Deposited: 07 Nov 2012 08:27
Last Modified: 07 Nov 2012 08:27
URI: http://eprints.uthm.edu.my/id/eprint/3218
Statistic Details: View Download Statistic

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