On the theory of the Ranque-Hilsch cooling effect

An extended Bernoulli equation, adapted to turbulent flow, is applied to a model of the rotational flow in the Ranque-Hilsch vortex tube. It is shown that on the basis of this model a reasonable quantitative explanation of the cooling effect can be given. The experimental results of Hilsch and of Elser and Hoch agree for the greater part with this theory.