On the dependence of a cold air production on the size of a hot air output area of the vortex tube

A model of a counterflow vortex tube is presented to investigate the dependence of the influence of hot exit area on the temperature separation. Computational experiments were done for 37 models for different values of the area of the hot exit ring. In a number of experiments, the pressure of the air supplied to the inlet varies in order to take into account the possible effects of computational and model errors. An anomalous result is obtained for the value of the hot exit area ∼30 cm2. Conclusions are drawn about the range of the most suitable hot exit sizes for the considered configuration of the vortex tube.