Hydrothermal performance of trapezoidal fin equipped with vortex generator and hole: Investigation of the effect of vortex generator and hole position

In this paper, the heat transfer coefficient and pressure drop are investigated by creating a hole between the vortex generators and their proper positioning. For this purpose, a numerical modeling of water flow in a rectangular channel in two laminar and turbulent flow regimes and for 5 models with different positions of vortex generator and hole including vortex generator in left and right, hole in top and bottom and Finally, both the vortex generator and the hole in the middle of the fin are provided for constant-size geometric parameters. In order to create a better comparison between the these positions, two relative ratios j/f and j/f1/3 are introduced and used. The results showed that in both flow regimes, by placing the hole in top and bottom of the trapezoidal fin, the pressure drop increased and the hydrothermal performance decreased, and the trapezoidal fin has the best hydrothermal performance when the vortex generator is in the left and right and the hole in the middle. So that the highest values of 0.0539 and 0.01504 are obtained, respectively, at the maximum and minimum Reynolds numbers for j/f and j/f1/3 in the turbulent flow.