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Abstract
In this paper, numerical Galerkin Finite Element Method (GFEM) is applied for conjugate heat-transfer of a rotating cylinder immersed in Fe3O4-water nanofluid under the heat-flux and magnetic field. The outer boundaries of the cavity were maintained at low temperatures while beside the cylinder were insulated. It is assumed that the cylinder rotates in both clockwise and counter-clockwise directions. The dimensionless governing equations such as velocity, pressure, and temperature formulation were analyzed by the GFEM. The results were evaluated using the governing parameters such as nanoparticles (NPs) volume fraction, Hartmann and Rayleigh numbers, magnetic field angle and NPs shapes. As a main result, the average Nusselt number increases by increasing the NPs volume fraction, inclination angle and thermal conductivity ratios, while increasing the Hartmann number decreased the Nusselt number. Furthermore, platelet NPs had the maximum average Nusselt number and spherical NPs made the minimum values of Nusselt numbers among examined NPs shapes.
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Details
1 University of Babylon, College of Engineering -Mechanical Engineering Department, Babylon City, Iraq (GRID:grid.427646.5) (ISNI:0000 0004 0417 7786)
2 Esfarayen University of Technology, Department of Mechanical Engineering, Esfarayen, Iran (GRID:grid.459462.8)
3 Xi’an Jiaotong University, International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an, China (GRID:grid.43169.39) (ISNI:0000 0001 0599 1243)