Abstract
Ranque-Hilsch vortex tube is a device which enables separation of hot and cold air as compressed air flows tangentially into vortex chamber through inlet nozzles. This separation process of cold and hot air by using principle of vortex tube has got wide range of applications in cooling equipment in CNC machines, refrigerators, cooling suits, heating processes, etc. Its popularity is mainly due to reliability, lack of maintenance and simple inexpensive construction. In general, a vortex tube is constructed to obtain maximum temperature separation. Main design parameters to be considered during vortex tube designing are length and diameter of vortex tube, diameter and location of inlet nozzle, diameter of cold nozzle etc. any of the design parameters which effect flow field within the tube will also affect the performance of vortex tube. Main objective of this present work is to conduct a numerical study on effect of length on temperature difference in vortex tube. A two-dimensional axisymmetric CFD model has been developed. Simulation of turbulent, compressible, highly swirling flow inside vortex tube is performed using RANS approach using ANSYS fluent 16.2 software. The second-order numerical schemes were used to carry out all the computations. In this numerical study, performance of Ranque-Hilsch vortex tubes, with length to diameter ratios of 3,5,6.915,8,9,10 and 15,18 were analyzed. It was found that the best performance was obtained when the ratio of vortex tube length to the diameter was 15.
Keywords
Ranque-Hilsch vortex tube, L/D Ratio, Numerical simulation, Temperature, CFD model.
References
Ranque GJ. Experiments on expansion in a vortex with simultaneous exhaust of hot air and cold air. J. Phys. Radium. 1933 Jun;4(7):112–4.
Hilsch R. The use of the expansion of gases in a centrifugal field as cooling process. Review of Scientific Instruments. 1947 Feb;18(2):108–13.
Bruun HH. Experimental investigation of the energy separation in vortex tubes. Journal of Mechanical Engineering Science. 1969 Dec;11(6):567–82.
Fröhlingsdorf W, Unger H. Numerical investigations of the compressible flow and the energy separation in the Ranque–Hilsch vortex tube. International Journal of Heat and Mass Transfer. 1999 Feb 1;42(3):415–22.
Aljuwayhel NF, Nellis GF, Klein SA. Parametric and internal study of the vortex tube using a CFD model. International journal of refrigeration. 2005 May 1;28(3):442–50.
Xue Y, Arjomandi M, Kelso R. A critical review of temperature separation in a vortex tube. Experimental Thermal and Fluid Science. 2010 Nov 1;34(8):1367–74.
Burazer JM, Ćoćić AS, Lečić MR. Numerical research of the compressible flow in a vortex tube using OpenFOAM software. Thermal Science. 2017;21(suppl. 3):745–58.
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