Studies on Vortex Tubes : 2nd Report, Reynolds Number. The Effects of the Cold Air Rate and the Partial Admission of Nozzle on the Energy Separation

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概要

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• The authors tried to explain the effects of the dimensions of a vortex tube (especially the rate of partial admission of nozzle) on the energy separation of gas flowing through it. They tried also to explain the influence of the cold air rate on the flow and thermal fields in a vortex tube with the optimum proportion of the total area of nozzle openings (F_n) to the cross-sectional area of main tube (F_t). From these researches the following results have been obtained : (1) The maximum efficiency of energy separation is obtained when F_n≒0.17F_t. (2) The values of turbulent diffusivity calculated from the tangential velocity profiles nearly coincide with the values computed from Keyes'empirical formula. Reynolds number of jet from the nozzle, R_<et>=(0.5〜3.0)×10^6. (3) For the case of large axial velocity, the modified formulae including the axial velocity terms (36) and (37) should be used to predict the stagnation temperature profile in the cross-section at the cold end of the tube.

• 一般社団法人日本機械学会の論文

著者

• Takahama Heishichiro

  Faculty Of Engineering Nagoya University

• SOGA Nobuo

  Nagoya Motor Vehicle Works, Mitsubishi Heavy Industries, Ltd.

• Soga Nobuo

  Nagoya Motor Vehicle Works Mitsubishi Heavy Industries Ltd.

関連論文

• Heat and Mass Transfer in Countercurrent Flow of Air and Water Film in a Rectangular Vertical Duct
• Studies on Vortex Tubes : 2nd Report, Reynolds Number. The Effects of the Cold Air Rate and the Partial Admission of Nozzle on the Energy Separation
• Studies on Vortex Tubes : (1) Experiments on Efficiency of Energy Separation : (2) On Profiles of Velocity and Temperature

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