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Second Thermal and Fluids Engineering  Conference

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

NATURAL CONVECTIVE HEAT TRANSFER FROM TWO THIN VERTICALLY SPACED AXIALLY ALIGNED HORIZONTAL ISOTHERMAL CIRCULAR PLATES

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

Abstract

Natural convection from two isothermal axially aligned horizontal thin circular plates having the same diameter has been numerically studied. The vertical distance between the plates is relatively small and there is an interaction between the flows over the plates which affects the heat transfer rates. The effect of the dimensionless vertical spacing between the plates on the mean heat transfer rates from the top and bottom surfaces of each plate and on the mean heat transfer rates from the entire surface of each plate has been studied. The numerical results have been obtained using the commercial CFD code ANSYS FLUENT©. The mean flow has been assumed to be steady and symmetrical about the vertical plate axes. The conditions considered include those under which turbulent flow can develop and the k-epsilon turbulence model with buoyancy force effects accounted for has been used in obtaining the solution. The heat transfer rates considered, expressed in terms of mean Nusselt numbers, will depend on the Rayleigh number, on the dimensionless spacing between the plates, and on the Prandtl number. Results have only been obtained for a Prandtl number of 0.74. Investigations of the effect of the dimensionless spacing between the plates on the variation of the Nusselt number with Rayleigh number have been undertaken.

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