The Ranque Hilsch phenomenon: Experimental visualization of the flow structure

Abstract

In this study, experimental investigations are conducted employing visualization techniques with the objective of elucidating the flow structure within the Ranque-Hilsch vortex tube. As part of the research project, a test rig has been constructed. The primary component of the rig is a transparent vortex tube made of acrylic glass. Three different working fluids are planned for use in the experiments: air, water, and silicone oil. The objective of the research is to lev�erage the unique properties of each fluid to achieve the desired outcome across a broader range of input flow parameters. In the current stage of the project, we are utilizing air as the working fluid, with the other working fluids to be investigated in subsequent stages. The flow input during the tests was planned for pressures of up to 4 bar (g) and flow rates up to 70 kg/h, but after preliminary results changed to very low pressures: up to 0,2 bar (g). The test rig was equipped with a laser and a high-speed camera setup to capture the flow with high spatial resolution.