Numerical analysis and an approach for optimization of the Ranque-Hilsch vortex tube for a compressible flow

The Ranque-Hilsch vortex tube is a fluidic device well-known for its energy separation capability. In the present study, the swirling flow inside the vortex tube are computational predicted and analyzed for the optimization purpose. The numerical analysis was conducted on a previously available vortex tube design and the results are well validated. After a thorough comparison, the Re -Normalization Group K -epsilon turbulence model is choose for a reliable computation of the vortex tube flow field. Effects of the inlet compressed gas properties shows a vital increment in the energy separation until the critical condition occurs in vortex tube. At the critical condition, the increase in the inlet pressure ratio result in the loss of swirl momentum through the hot exit rather than increasing the thermal separation. Analyzing the results, the optimal vortex tube dimensions such as radius and length are predicted to reduce the loss in kinetic energy. The graphical optimization method proposed by the parametric study has to be validated by reliable experimental studies.