Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Numerical Simulation of Convection Heat transfer in Circular Fins
Submission Author:
Sandi Souza , RN
Co-Authors:
Kleiber Lima de Bessa
Presenter: Sandi Souza
doi://10.26678/ABCM.ENCIT2016.CIT2016-0502
Abstract
This paper seeks to increase knowledge about the devices used to enhance the heat transfer process, called Fins. For the engineering design of the fins, the classic literature suggests that the convective heat transfer coefficient must be equivalent to the surface without fins. But it is known that the presence of fins modifies the geometry and cause the change of the convective heat transfer coefficient. So the objective of this work was to study and quantify the change of convective coefficients and its interference in the heat transfer process. For this was employed the dynamics CFD computational fluid, and was elected for this purpose a geometry previously studied using experimental techniques. Six cases were studied, varying the boundary conditions, wall temperature and temperature of the surrounding fluid. The studied geometry was a circular fin with non-uniform cross section. The tube without fins was also simulated, in order to determine the convective coefficient. Also the dimensioning using the analytical model for the fin efficiency and heat transfer rate were developed. The results obtained from the numerical simulation indicate a strong change of the convective coefficient. The results obtained from the numerical simulation indicate a strong change of the convective coefficient and agree with the experimental results. This work shows the velocity and temperature fields, the convective coefficient for situations with and without fins. Comparisons between numerical results and those obtained using the analytical and experimental techniques, are also shown.
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