Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh

ICME09-FM-24

EFFECT OF A HEATED HOLLOW CYLINDER ON COMBINED
FREE AND FORCED CONVECTION IN A VENTILATED CAVITY
 

M. M. Rahman, M. A. Alim and M. A. H. Khan
Department of Mathematics, Bangladesh University of Engineering and Technology (BUET),
Dhaka, Bangladesh

ABSTRACT

Effect of a heated hollow cylinder on combined free and forced convection in a ventilated cavity is studied numerically. The wall of the cavity is assumed to be adiabatic. Flows are imposed at the bottom of the left wall and exited at the top of the right wall of the cavity. The heated cylinder is placed at the center of the cavity. The present study simulates a practical system such as an air-cooled electronic equipment with a heat component or an oven with heater. Emphasis is sited on the influences of the cylinder diameter and thermal conductivity of the cylinder in the cavity. The consequent mathematical model is governed by the coupled equations of mass, momentum and energy and is solved by employing Galerkin weighted residual method of finite element formulation. A wide range of pertinent parameters such as Reynolds number, Richardson number, cylinder diameter and the solid-fluid thermal conductivity ratio are considered in the present study. Various results such as the streamlines, isotherms, heat transfer rates in terms of the average Nusselt number and average fluid temperature in the cavity are presented for different parameter. It is observed that the cylinder diameter has significant effect on both the flow and thermal fields but the solid-fluid thermal conductivity ratio has insignificant effect on the flow field.
 

Keywords: Hollow Cylinder, Ventilated Cavity, Combined Free And Forced Convection.

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