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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NATURAL CONVECTIVE HEAT TRANSFER FROM TWO ISOTHERMAL FLAT PLATES WITH ONE IN HORIZONTAL AND THE OTHER INCLINED
Submission Author:
Kaic Fernando Aparecido da Silva , SP
Co-Authors:
Kaic Fernando Aparecido da Silva, Santiago del Rio Oliveira
Presenter: Kaic Fernando Aparecido da Silva
doi://10.26678/ABCM.ENCIT2020.CIT20-0082
Abstract
A numerical study of the heat transfer process by natural convection in two flat isothermal plates with the same depth has been undertaken. In this study, the vertical distance between the two plates is relatively small, and as a result, there is an interaction between the flows over both plates, which affects their heat transfer rates. Furthermore, it is considered that one of the plates is kept in a horizontal position, while the other is inclined in relation to the horizontal plane. Both the case where the below plate is horizontal, and the above plate is inclined and the case where the below plate is inclined, and the above plate is horizontal have been considered. Through simulations, the effect of the dimensionless vertical spacing between the plates and the angle of inclination of the inclined plate on the mean heat transfer rates over the entire surface of each plate have been studied. The mean flow has been assumed to be steady and the conditions considered included those under which turbulent flow can develop. The standard k − ε turbulence model with buoyancy force effects accounted was used to obtain the numerical solution. The numerical solutions were performed with the aid of the commercial CFD solver ANSYS FLUENT©. The heat transfer rates considered, expressed in terms of mean Nusselt numbers, depend on the Rayleigh number, the angle of inclination of the inclined plate, whether it is the above or below plate that is inclined and on the dimensionless vertical spacing between the plates. Results have only been obtained for a Prandtl number of 0.71, i.e., the value for air at ambient conditions.
Keywords
natural convective heat transfer, k ε turbulence model, isothermal plates, inclined plates
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