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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL ANALYSIS OF THE NATURAL CONVECTIVE HEAT TRANSFER BETWEEN TWO HORIZONTAL ISOTHERMAL WAVY SURFACES
Submission Author:
William Nunes , SP , Brazil
Co-Authors:
William Nunes, Santiago del Rio Oliveira
Presenter: William Nunes
doi://10.26678/ABCM.ENCIT2020.CIT20-0035
Abstract
This article consists of the numerical analysis of the natural convective heat transfer from two horizontal surfaces separated vertically containing waves on both sides. The vertical 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 horizontal 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 vertical distance between the surfaces and the Rayleigh number. Results will be obtained numerically using the standard k − e 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 horizontal wavy surfaces.
Keywords
natural convective heat transfer, wavy surfaces, Heat transfer enhancement, K - e turbulence model
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