Abstract
The flow in a Ranque tube with a square cross-section channel has been studied using the hydraulic concept of strongly swirling flow with a circulation zone. Based on experimental data, it has been found that for flow in a vortex tube, the hydraulic condition of flow crisis is satisfied: the longitudinal velocity becomes equal to the velocity of propagation of centrifugal waves at the boundary between the vortex and the circulation zone. It has been shown that the temperature variation along the flow occurs mainly in the region of the working channel in which the ratio of the longitudinal velocity at the vortex boundary to the propagation velocity of centrifugal waves fluctuates about unity. The existence of a previously unknown energy separation mechanism due to the presence of hydraulic jumps in the development of internal waves in a Ranque tube was assumed.
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References
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The study of the flow in the Ranque—Hilsch tube was performed within the framework of State Assignment for the Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences No. AAAA-A18-118051690120-2, and the development of the experimental procedure for studying the flow was supported by the Russian Foundation for Basic Research (Grant No. 18-31-20036).
Original Russian Text © M.Kh. Pravdina, I.K. Kabardin, V.I. Polyakova, D.V. Kulikov, V.G. Meledin, V.A. Pavlov, M.R. Gordienko, N.I. Yavorsky.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 61, No. 3, pp. 82–89, May–June, 2020.
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Pravdina, M.K., Kabardin, I.K., Polyakova, V.I. et al. Hydraulic Flow Instability in a Ranque Tube. J Appl Mech Tech Phy 61, 384–390 (2020). https://doi.org/10.1134/S0021894420030098
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DOI: https://doi.org/10.1134/S0021894420030098