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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL ANALYSIS OF THE NATURAL CONVECTIVE HEAT TRANSFER FROM HORIZONTAL SURFACES CONTAINING TRAPEZOIDAL WAVES WITH VARIABLE HEIGHT
Submission Author:
Nickolas Castro Bernardini , SP
Co-Authors:
Nickolas Castro Bernardini, Santiago del Rio Oliveira
Presenter: Nickolas Castro Bernardini
doi://10.26678/ABCM.ENCIT2020.CIT20-0251
Abstract
This article consists of a numerical analysis of the natural convective heat transfer from a horizontal surface containing a wavy surface on one side. The wavy surface considered in this project have a trapezoidal shape with variable height, having the effect of increasing the heat transfer rate from the heated surface to an adjacent fluid, in this case, ambient air. The main objective of this work is to calculate the natural convective heat transfer rate between the wavy horizontal surface and the ambient air. Effects on the natural convective heat transfer rate from the surface containing trapezoidal waves will be analyzed as a function of the following variables: number of waves, profile of wavy heights, ratio between the largest base and smallest base of the waves 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, recommendations may be made such as the number of waves, the profile of wavy heights and the ratio of the larger base to the minor base of the waves that provide the greatest improvement in natural convective heat transfer rate from the heated horizontal surface.
Keywords
natural convective heat transfer, wavy surfaces, Heat transfer enhancement, k − e turbulence model
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