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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

A NUMERICAL STUDY OF NATURAL CONVECTIVE HEAT TRANSFER FROM HORIZONTAL ISOTHERMAL HEATED ELEMENTS OF COMPLEX SHAPE

DOI: 10.1615/TFESC1.fnd.012863
pages 843-854

Patrick H. Oosthuizen
Dept. of Mechanical and Materials Engineering, Queen's University Kingston, Ontario Canada K7L 3N6


KEY WORDS: Natural convection, Numerical, Heated Element, Horizontal surface, Complex shape, Upward facing, Downward Facing

Abstract

Natural convective heat transfer from a horizontal isothermal heated plane having either an I or a + shape imbedded in a larger surrounding flat adiabatic surface has been numerically investigated. The situation considered is a simplified model of those that can arise in the cooling of some non-computer electronic devices in various industrial applications. Due to the presence of several abutting components in such applications, the heat transfer often effectively occurs from elements of complex shape similar to the two shapes considered here. The surface of the heated is assumed to be in the same plane as the surrounding adiabatic surface. Both the case where the heated element is facing upward and where the heated element is facing downward were considered. Because of the applications being considered the heat transfer from the element has been assumed to be to air. Results have been obtained for a wide range of the governing parameters using the commercial CFD code ANSYS FLUENT©. These results have been used to study whether the heat transfer rates in the laminar, transitional and turbulent flow regions for the two surface shapes considered can be correlated in each of these three separate flow regions in terms of a single equation based on the use of an appropriate length scale. The results have also been used to determine whether the element shape has a strong effect on the conditions under which transition to turbulence begins and to determine when fully turbulent flow exists.

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