CFD Study on the Effects of Nozzle Number on Turbulent Flow and Energy Separation in a Ranque-Hilsch Vortex Tube

Abstract:

In this paper, the effects of nozzles number on the internal flow in a counter flow Ranque-Hilsch vortex tube (RHVT) are studied. A 3D structured discretized model of a counter flow multi nozzle RHVT is developed to study the dynamic behaviour of the highly swirling, compressible turbulent flow. Simulations of the turbulent flow are performed using standard k-ε model with 2, 4, 6 and 8 number of nozzles at the computational inlet. Total temperature profiles and total energy separations are studied as a function of nozzle number and total nozzle cross section area. It is observed that cooling effect increases as the nozzle number increases irrespective of total nozzle cross section area.

• Periodical: Applied Mechanics and Materials (Volumes 465-466)
• Pages: 505-509
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.465-466.505
• Online since: December 2013
• Authors: Nilotpala Bej, Kalyan Prasad Sinhamahapatra
• Keywords: 3D Numerical Model, Energy Separation, Nozzles Number, Ranque-Hilsch Vortex Tube

References

[1] G.J. Ranque, Experiments on expansion in a vortex with simultaneous exhaust of hot air and cold air, J. Phys. Radium (Paris) 4 (1933). 112–114, S-115.

[2] G.J. Ranque, Method and Apparatus for Obtaining from a Fluid under Pressure Two Outputs of Fluid at Different Temperatures, US Patent 1: 952, 281, (1934).

[3] R. Hilsch , The use of the expansion of gases in a centrifugal field as cooling process, Rev. Sci. Instrum. 18 (2) (1947) 108–113.

DOI: 10.1063/1.1740893

[4] C.D. Fulton, Ranque's tube. J. ASRE Refrigerating Eng, 58(1950), 473.

[5] K. Dincer, Tasdemir, S., Baskaya, S., Uysal, B.Z., Modeling of the effects of length to diameter ratio and nozzle number on the performance of counterflow Ranque–Hilsch vortex tubes using artificial neural networks. J of Applied Thermal Engineering 28(2008).

DOI: 10.1016/j.applthermaleng.2008.01.016

[6] A. Seccharoli, Numerical simulation of turbulent flow in a Ranque–Hilsch vortex tube, Int. J. Heat Mass Transfer 52 (23–24) (2009) 5496–5511.

DOI: 10.1016/j.ijheatmasstransfer.2009.05.031

[7] S. Eiamsa-ard, Wongcharee,. Promvonge P. Experimental investigation on energy separation in a counter-flow Ranque–Hilsch vortex tube: Effect of cooling a hot tube. Int Communications in Heat and Mass Transfer. 37(2010), 156–162.

DOI: 10.1016/j.icheatmasstransfer.2009.09.013

[8] J. Marshall, Effect of operating conditions, physical size and fluid characteristics on the gas separation performance of the Linderstrom–Lang vortex tube. Int J Heat and Mass Transfer 20 (1977), 27–31.

DOI: 10.1016/0017-9310(77)90209-5

[9] T. Dutta, K.P. Sinhamahapatra, Comparison of different turbulence models in predicting the temperature separation in a Ranque–Hilsch vortex tube, Int J Refrig. 33 (2010), 783-792.

DOI: 10.1016/j.ijrefrig.2009.12.014