Performances Analysis of Vortex Tube on CFD with Straight and Helical Nozzle

Abstract

In this article computational fluid dynamics analysis of a 3-D steady state compressible and turbulent flow
has been carried out through a vortex tube.The numerical models use the k-ɛ turbulence model to stimulate an
axisymmetric computational along with periodic boundary conditions. The present research has focused on the energy
separation and flow field behavior of a vortex tube by using straight and helical nozzles. Three kinds of nozzles set
include of 3 and 6 straight and 3 helical nozzles have been investigated and their principle affects as cold temperature
difference was compared. The studied vortex tube dimensions are kept the same for all models. The numerical values of
hot and cold outlet temperature differences denotes the considerable operating role of helical nozzles,aven a few number
of that in comparing with straight nozzles.The result showed that this type of nozzles causes to form higher swirl velocity
in the vortex chamber than straight one. To be presented numerical results in this paper are validated by both available
experimental data and flow characteristics such as stagnation point situation and the location of maximum wall
temperature as two important facts. These comparisons showed reasonable agreement.