Abstract: The performances of energy separation have been experimentally studied in vortex tubes with compressed air as the working medium. This paper presents experimental results of the energy separation in the vortex tube under different operating conditions. It is experimentally evidenced that the inlet pressure greatly influences the separation performance while the effect of the inlet temperature can be negligible. The most important point revealed in this paper is that an optimum energy separation can be achieved by varying the fraction of the flow rate of the cold stream to the total flow rate at entrance.
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