Computational fluid dynamics based heat transfer within finned flat with perforations

Abstract

In the past few years, the study of fins has been determined with the variations in their material selections and material properties. Several studies have been carried out by the researcher to select appropriate geometries and shapes of the fins to increase the heat transfer rate. In this paper the studied have been carried out with two distinct parameters namely heat transfer and the flow of air over the flat tube attached with the perforated circular fins. The circular fin connected with tube has been modified with different perforated geometries of same cross sectional area. The perforations are given to three fins geometries and the results are being compared with the normal circular fins attached with the flat tube. The flow velocity of air have been taken from 3 m/s to 7 m/s and applied to each of the geometries that have been taken for the simulation process. The result stated that the circular fins having trapezoidal perforations has the maximum heat transfer rate at 284.685 W/m2 and that of Nusselt number 174.50 following with the star perforation and others. The maximum heat dissipation rate showed for the flow of air at velocity 7 m/s for the trapezoidal perforation following with 6 m/s, 5 m/s, 4 m/s, and 3 m/s. This analysis and simulation has been performed using ANSYS 16 software and for the calculations of heat transfer coefficient and friction factors RNG k-ε turbulence model is used The finite volume method and meshing process have been applied to all of the cases using the CFD fluent model pack.