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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
STUDY OF THE INFLUENCE OF HEAT SINK GEOMETRIC PARAMETERS ON NATURAL CONVECTION USING ANALYSIS OF EXPERIMENTAL TESTS AND OpenFOAM SIMULATION
Submission Author:
Sandro Metrevelle Marcondes de Lima e Silva , MG , Brazil
Co-Authors:
Vilson Altair da Silva, Lorenzo Alfonso Caliari de Neves Gomes, Ana Silva, Sandro Metrevelle Marcondes de Lima e Silva
Presenter: Vilson Altair da Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0652
Abstract
The steady state heat transfer by natural convection in heat sinks with rectangular fins positioned vertically and horizontally was studied in this work. The heat transfer by radiation, and an almost uniform temperature in the heat sinks was also considered. This second condition allowed the use of thermocouples only in the center of the heat sink. Twelve heat sinks were designed to study how their geometric parameters such as height, spacing and thickness of the fins, influence the heat transfer by free convection. In addition, in this work, two correlations for heat transfer by free convection using the dimensionless parameters Nusselt and Rayleigh are tested. These correlations were obtained using the results for the 12 heat sinks over a temperature range between 20 °C and 100 °C. Furthermore studies were done to identify which of the 12 evaluated heat sink managed to remove the greatest amount of heat for a given temperature range. The results were compared with results obtained from empirical correlations found in the literature and with a simulation done using open source CFD software OpenFOAM (Open Field Operation and Manipulation) was used to solve the three-dimensional equations of continuity, momentum and energy. This computational simulation uses the PIMPLE solution algorithm for the pressure-velocity coupling and the Finite Volume Method for the discretization of the governing equations. The temperature, velocity and vorticity fields were numerically obtained.
Keywords
Heat sinks, Free convection, Rectangular Fins, Empirical Correlation, Heat transfer coefficient, OpenFOAM, Numerical Methods
