Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ANALYTICAL AND NUMERICAL STUDY OF RADIATION IN HEAT SINKS OF RECTANGULAR FINS
Submission Author:
Sandro Metrevelle Marcondes de Lima e Silva , MG , Brazil
Co-Authors:
Felipe Henrique Rafael, Vilson Altair da Silva, Bruno de Campos Salles Anselmo, Sandro Metrevelle Marcondes de Lima e Silva
Presenter: Felipe Henrique Rafael
doi://10.26678/ABCM.COBEM2019.COB2019-1465
Abstract
The objective of this study is to present an analytical model for the determination of the thermal radiation in heat sinks of rectangular base and fins, and to verify the influence of geometric parameters and the emissivity on the net radiation heat flux. The analytical model used establishes a view factor that assumes a uniform radiosity surface. The influence of this hypothesis was analyzed through a numerical study using the software COMSOL Multiphysics®.The radiation study was performed in 6 heat sinks varying in height and spacing of the fins, which radiosity changes along the surface were considered. The results for the analytical and numerical model presented good accordance, providing a maximum relative deviation of 5.5%. On the other hand, the omission of the view factor was also evaluated, resulting in a maximum deviation of 104.8% in relation to the numerical data. Finally, a diagram was proposed relating the geometric parameters, the emissivity and the view factor. With this diagram is possible to extend the analysis, providing a general interpretation of the radiation in function of the dimensions and the emissivity, an alternative approach for the determination of the view factor of the heat sinks of rectangular fins.
Keywords
Heatsinks, radiation, Natural Convection, COMSOL, View Factor
