The vortex tube of the water desalination evaporator system is studied based on the Ranque-Hilsch vortex effect. Vortex effects mathematical model is based on Reynolds Equations which is completed by k-w SST turbulence differential model. One of the goals of the research is to define the geometry of the vortex tube scaled model. Another goal of the research is to define the input parameters for Reynolds Stress Turbulence Model. The results of the research are the defined optimal geometry parameters of the vortex tube prototype and input parameters required for Reynolds Stress Turbulence Model analysis.