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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
STUDY OF THE INFLUENCE OF ONE AND TWO TRIANGULAR STEPS IN THE NATURAL CONVECTIVE HEAT TRANSFER RATE FROM A THIN HORIZONTAL SURFACE WITH ONE HEATED SIDE
Submission Author:
Santiago del Rio Oliveira , SP
Co-Authors:
Santiago del Rio Oliveira, Vicente Luiz Scalon, Kaic Fernando Aparecido da Silva
Presenter: Santiago del Rio Oliveira
doi://10.26678/ABCM.ENCIT2020.CIT20-0309
Abstract
This article consists of the numerical analysis of the influence of one and two triangular steps in the natural convective heat transfer from a thin horizontal surface with one heated side. The main objective of this work is to calculate the natural convective heat transfer rate between the surface with triangular steps and the ambient air. Two situations were considered. A horizontal plate containing one triangular step with angles varying between 2o to 6o and a horizontal plate containing two triangular steps, being the first step similar to the previous one and the second step with angles varying between 3o to 7o. All results obtained with one and two triangular steps were compared with the situation of a thin horizontal plate with one heated side without triangular steps subject to natural convective heat transfer to the ambient air. Effects on the natural convective heat transfer were analyzed according to the inclination angle of both triangular steps and the Rayleigh number varying between 106 to 1012. Results were obtained numerically using the standard 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 plate with one and two triangular steps.
Keywords
natural convective heat transfer, k-e turbulence model, isothermal plates, triangular steps, Heat transfer enhancement
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