Paper Title
Energy Conversion (Efficiency) of Straight Counter flow Ranque-hilsch Vortex Tube (RHVT) by using Optimized Turbulence Model

Abstract
The design of innovative Ranque-Hilsch vortex tube (RHVT) for the development of green and low cost refrigeration and air conditioning systems has become increasingly important in cooling (and heating) process industries. In this light improving the thermal efficiency (cooling optimization) of the RHVT has been an ongoing concern. This research article demonstrates how using different turbulence models may affect the temperature detachment (the temperature diminution of cold air (ΔT𝑐 = T𝑖 − T𝑐 )) inside straight counter-flow Ranque-Hilsch Vortex Tube (RHVT). The code is utilized to find the optimized turbulence model for energy separation by comparison with the experimental data of the setup. To obtain the results with a minimum error, ten turbulence models have been investigated in steady state and transient time dependence modes. Results show that RNG k-ԑ turbulence model has the best correspondence with the obtained experimental data from the setup; therefore, by using a RNG k-ԑ turbulence model with respect to Finite Volume Method (FVM), all the computations have been carried out. Keywords - Energy optimization; Computational Fluid Dynamic (CFD); Temperature Diminution of cold air (ΔT𝑐); Turbulence model.