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Effect of rotating cylinder on heat transfer in a square enclosure filled with nanofluids

Roslan, Rozaini and H., Saleh and I., Hashim (2012) Effect of rotating cylinder on heat transfer in a square enclosure filled with nanofluids. International Journal of Heat and Mass Transfer, 55. ISSN 00179310

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Convective heat transfer in a differentially heated square enclosure with an inner rotating cylinder is studied theoretically. The free space between the cylinder and the enclosure walls is filled with water–Ag, water–Cu, water–Al2O3 or water–TiO2 nanofluids. The governing equations are formulated for velocity, pressure and temperature formulation and are modeled in COMSOL, a partial differential equation (PDE) solver based on the Galerkin finite element method (GFEM). The governing parameters considered are the solid volume fraction, 0.0 ⩽ ϕ ⩽ 0.05, the cylinder radius, 0 ⩽ R ⩽ 0.3 and the angular rotational velocity, −1000 ⩽ Ω ⩽ 1000. The results are presented to show the effect of these parameters on the heat transfer and fluid flow characteristics. It is found that the strength of the flow circulation is much stronger for a higher nanoparticle concentration, a better thermal conductivity value and a smaller cylinder with a faster, negative rotation. The maximum heat transfer are obtained at a high nanoparticle concentration with a good conductivity value, a slow positive rotation and a moderate cylinder size located in the center of the enclosure.

Item Type: Article
Uncontrolled Keywords: mixed convection; nanofluids; rotating cylinder
Subjects: Q Science > QC Physics
Divisions: Faculty of Applied Science and Technology > Department of Science and Mathematics
Depositing User: En. Muhamad Saufi Che Rusuli
Date Deposited: 04 Mar 2013 04:32
Last Modified: 04 Mar 2013 04:32
URI: http://eprints.uthm.edu.my/id/eprint/3101
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