Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 53 7 2021 09 23 The effect of hole on the rectangular vortex generator on thermal-hydrodynamic performance of the minichannel The effect of hole on the rectangular vortex generator on thermal-hydrodynamic performance of the minichannel 4293 4308 4195 10.22060/mej.2020.18757.6885 FA Nadia Pahlevaninejad Department of Mechanical Engineering, Faculty of Mechanical Engineering, Babol Noshiravani University of Technology, Babol, Iran Masoume Rahimi Department of Mechanical Engineering, Faculty of Engineering, Golestan university, Gorgan, Iran Ali Akbar Ranjbar Department of Mechanical Engineering, Faculty of Engineering, Golestan University, Gorgan, Iran Majid Gorzin Department of Mechanical Engineering, Faculty of Mechanical Engineering, Babol Noshiravani University of Technology, Babol, Iran Journal Article 2020 07 24 There are several ways to increase heat transfer in mini-channels, like adding a vortex generator. In this paper, the effect of the presence of the hole on vortex generators on the heat transfer parameters is examined. In this study, a 50 mm long minichannel with eleven rectangular vortex generators, with holes with area of 5 to 60% of the vortex generator area, was analyzed with water-based fluid under constant flux in the range of Reynolds numbers 200-1000. The results showed the presence of holes on the vortex generators reduced the pressure drop resulting from the obstruction against the fluid flow and 34.7% decrease in pressure drop is observed for minimum and maximum area of holes in Reynolds number 1000. The Nusselt number is increased by existence of a hole in the Reynolds numbers range and then is decreased by increasing the size of the hole due to the reduction of the vortex size behind the obstacle, so that in the maximum Reynolds number by increasing hole size, 34.3% decrease is observed. There are several ways to increase heat transfer in mini-channels, like adding a vortex generator. In this paper, the effect of the presence of the hole on vortex generators on the heat transfer parameters is examined. In this study, a 50 mm long minichannel with eleven rectangular vortex generators, with holes with area of 5 to 60% of the vortex generator area, was analyzed with water-based fluid under constant flux in the range of Reynolds numbers 200-1000. The results showed the presence of holes on the vortex generators reduced the pressure drop resulting from the obstruction against the fluid flow and 34.7% decrease in pressure drop is observed for minimum and maximum area of holes in Reynolds number 1000. The Nusselt number is increased by existence of a hole in the Reynolds numbers range and then is decreased by increasing the size of the hole due to the reduction of the vortex size behind the obstacle, so that in the maximum Reynolds number by increasing hole size, 34.3% decrease is observed. https://mej.aut.ac.ir/article_4195_a5e308070bd6dd3cc56283f2313522de.pdf