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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL ANALYSIS OF THE NATURAL CONVECTIVE HEAT TRANSFER BETWEEN TWO VERTICAL ISOTHERMAL WAVY SURFACES
Submission Author:
Leandro Ferri , SP
Co-Authors:
Leandro Ferri, Santiago del Rio Oliveira
Presenter: Leandro Ferri
doi://10.26678/ABCM.ENCIT2020.CIT20-0036
Abstract
This article consists of the numerical analysis of the natural convective heat transfer from two vertical surfaces separated horizontally containing waves on both sides. The horizontal distance that separates the surfaces is relatively small in such a way that the flow from both surfaces influences the heat transfer rates from each surface. The waves considered in this work have a rectangular shape with constant height, having the effect of increasing the heat transfer rate of the heated plates to an adjacent fluid, in this case, ambient air. The main objective of this article is to determine the natural convective heat transfer rates from the vertical wavy surfaces to the ambient air. Effects on the natural convective heat transfer from the individual surfaces of each plate as well as from the total surface of each plate will be analyzed according to the following variables: dimensionless height of the waves, dimensionless horizontal distance between the surfaces and the Rayleigh number. Results will be obtained numerically using the standard k - ε turbulence model including effects of buoyant forces with the aid of the commercial CFD solver ANSYS FLUENT©. Depending on the results obtained, geometric recommendations of the situation under analysis can be made that provide the greatest improvement in the natural convective heat transfer rate from the vertical wavy surfaces.
Keywords
natural convective heat transfer, wavy surfaces, Heat transfer enhancement, k ε turbulence model
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