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

ICME09-FM-05

CONVECTIVE HEAT TRANSFER FROM HEATED OBJECT
IN A SQUARE ENCLOSURE

M. I. Haque,1 and K. A. Hossain,2
Department of Mechanical Engineering, Khulna University of Engineering & Technology, Bangladesh

ABSTRACT

This paper presents, the computational analysis of natural convection heat transfer from a heated object in an square enclosure. The enclosure has two ventilators at the top of the vertical side walls. An isothermally heated object is placed at the middle of the bottom of the container and all walls are assumed to be adiabatic The SUR method is used to solve discritized two dimensional continuity, Navier-Stokes and energy equation on the basis of stream function-vorticity formulation by the finite difference method. Uniform grids are used throughout the computational domain. The fluid flow characteristics and temperature behavior is investigated throughout the enclosure. The fluid from the surrounding entrains into the enclosure and fills up the empty space. Rayleigh numbers in the range from 1.0x102 to 1.0x104 is considered for the investigation. The heating efficiency of the enclosure is increases with the decrease of Rayleigh numbers.

Keywords: Free Convection, Heating efficiency, Enclosure, Recirculation, Separating Stream line.

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