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http://dx.doi.org/10.5293/kfma.2016.19.1.011

A Numerical Study on the Effect of Pitch Angle of Helical Nozzle on the Vortex Tube Performance Characteristics  

Oh, Yeong Taek (Graduate School, Department of Aerospace Engineering, Pusan National University)
Kim, Kuisoon (Department of Aerospace Engineering, Pusan National University)
Publication Information
The KSFM Journal of Fluid Machinery / v.19, no.1, 2016 , pp. 11-17 More about this Journal
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 $k-{\varepsilon}$ turbulence model by using FLUENT 13.0. The effect of the pitch angle of helical nozzle was described in term of ${\beta}$. A CFD analysis was performed on ${\beta}=0^{\circ}$, $5^{\circ}$, $10^{\circ}$, $15^{\circ}$. In order to realize the influence of ${\beta}$ on performances of the vortex tube. Computation results were expressed by the ${\beta}-{\Delta}T_{h,c}$ graph and radial profiles of axial velocity and swirl velocity. The results showed that ${\beta}$ which improves energy separation capacity of vortex tube was $5^{\circ}$ at ${\alpha}=0.33$, 0.5 and $10^{\circ}$ at ${\alpha}=0.33$. Besides, It was confirmed that the results were closely related to axial velocity and swirl velocity.
Keywords
Axial Velocity; Cold Gas Mass Fraction; Energy Separation; Helical Nozzle; Pitch Angle; Swirl Velocity; Vortex Tube;
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