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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
A NUMERICAL STUDY OF NATURAL CONVECTIVE HEAT TRANSFER FROM A HORIZONTAL TWO-DIMENSIONAL TWO-SIDED PLATE HAVING ONE OR TWO ADIABATIC SECTIONS
Submission Author:
Anelize Terroni Teixeira , SP
Co-Authors:
Anelize Terroni Teixeira, Santiago del Rio Oliveira
Presenter: Anelize Terroni Teixeira
doi://10.26678/ABCM.ENCIT2022.CIT22-0578
Abstract
This study was carried out with the aim of examining the behavior of the presence of adiabatic sections in a flat plate subjected to conditions of natural convective heat transfer, evaluating how the position and size of these adiabatic sections can interfere in natural convective heat transfer rate. To verify the effect that the presence of these adiabatic sections would cause, numerical analysis was used by simulating the mathematical model in CFD using the commercial software AnsysFluent. The conditions used in the plate for the physical modeling of the problem were a horizontal, two-dimensional isothermal plate, allowing heat transfer on both sides of the plate. For the numerical simulation to be possible, it was also necessary to setup some dimensional parameters of the plate, as well the properties of the plate and the air. A first cycle of simulations was performed considering the surface temperature of the plate to be 310 K while the ambient air temperature was 290 K, the length and width of the plate was 1 m and it was divided into 3 equal-sized sections in which the middle section was made up of the adiabatic region. A second simulations cycle was performed considering the same temperatures for the plate and the air as well the length and width of the plate, however the length of the plate was divided into 5 sections of the same size so that the second and fourth sections were composed of the adiabatic regions. Both cases were simulated considering a symmetric mean flow in relation to the central plane of the plate, using the k-ε method for turbulent regime with buoyant force effects. The results were obtained in terms of comparison between the mean Nusselt number and the Rayleigh number as well the comparison between the heat transfer rates with and without the adiabatic sections. In these simulations, the Prandtl number was considered constant for air.
Keywords
Natural Convection, Numerical simulation, Heat transfer enhancement, CFD, adiabatic sections
