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2. The use of the expansion of gases in a centrifugal field as cooling process;Hilsch;Rev. Sci. Instrum.,1947
3. R. Westley, Optimum design of a vortex tube for achieving larger temperature drop ratios, Cranfield College Note 30, College of Aeronautics, 1955.
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5. C.U. Linderstrom-Lang, Studies on transport of mass and energy in the vortex tube – The significance of the secondary flow and its interaction with the tangential velocity distribution, Riso report, Denmark, September 1971.