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Abstract:In this paper, entropy and exergy of a vortex tube with two vortex chambers is studied. Computational fluid dynamics (CFD) analysis of a three-dimensional, steady state, compressible and turbulent flow is carried out through a vortex tube. The standard k-turbulence model is used to analyse highly rotating complex flow field. The entropy, inlet and outlet exergies, destruction of exergy and exergy efficiency are studied. Results show that for different inlet pressures, there is an optimum distance for placing second chamber to have maximum exergy efficiency. Placing second chamber at the axial interval of Z = 1.5-5 mm leads to have minimum cold temperature, maximum hot temperature and maximum exergy efficiency, in comparison with one chamber.