Abstract
ABSTRACT In this paper, a numerical analysis was performed to investigate the effect of the pitch angle of a helical nozzle on the performance characteristics of a vortex tube. Three-dimensional numerical simulation has been performed with standard k-eturbulence model by using FLUENT 13.0. The effect of the pitch angle of helical nozzle was described in term of . A CFD analysis was performed on , , , . In order to realize the influence of on performances of the vortex tube. Computation results were expressed by the - ∆ graph and radial profiles of axial velocity and swirl velocity. The results showed that which improves energy separation capacity of vortex tube was at and at . Besides, It was confirmed that the results were closely related to axial velocity and swirl velocity. Nomenclature Greek symbolsL: Tube length : Cold gas mass fractionD: Tube diameter : Pitch angleH: Nozzle height ∆ : Difference of parameterW: Nozzle widthSubscripts : Area : Diameter : Inlet :Massflowrate ColdexitR: Tube radius : Hot exit : Temperaturer: Radial distancez: Axial distance
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