Comparison of different two equation turbulence models for studying the effect of cold outlet diameter on cooling performance of vortex tube

This paper presents a comparison between different two equation turbulence models, in order to find appropriate turbulence model for studying the effect of cold outlet diameter on cooling performance of vortex tube. The standard k-ε, RNG k-ε, Realizable k-ε and standard k-ω model, have been used in this study. Comparison between numerical and experimental results indicates that standard k-ε model predicts energy separation phenomenon better than others. Distribution of static temperature, total temperature, static pressure, components of velocity and angular velocity have been obtained in order to understand the flow behavior inside the tube. Moreover, standard k-ε model has been used for studying the effect of cold outlet diameter on cooling performance of vortex tube.