THERMAL SCIENCE

International Scientific Journal

Nader Pourmahmoud

,

Amir Hassan Zadeh

,

Omid Moutaby

,

Abdol Reza Bramo

CFD ANALYSIS OF HELICAL NOZZLES EFFECTS ON THE ENERGY SEPARATION IN A VORTEX TUBE

ABSTRACT
In this article computational fluid dynamics (CFD) analysis of a three-dimensional steady state compressible and turbulent flow has been carried out through a vortex tube. The numerical models use the k-ε turbulence model to simulate an axisymmetric computational domain along with periodic boundary conditions. The present research has focused on the energy separation and flow field behavior of a vortex tube by utilizing both straight and helical nozzles. Three kinds of nozzles set include of 3 and 6 straight and 3 helical nozzles have been investigated and their principal effects as cold temperature difference was compared. The studied vortex tubes dimensions are kept the same for all models. The numerical values of hot and cold outlet temperature differences indicate the considerable operating role of helical nozzles, even a few numbers of that in comparing with straight nozzles. The results showed that this type of nozzles causes to form higher swirl velocity in the vortex chamber than the 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.
KEYWORDS
vortex tube, CFD simulation, stagnation point, energy separation, helical nozzles
PAPER SUBMITTED: 2011-05-31
PAPER REVISED: 2011-07-30
PAPER ACCEPTED: 2011-08-01
DOI REFERENCE: https://doi.org/10.2298/TSCI110531085P
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 1, PAGES [151 - 166]
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CFD analysis of helical nozzles effects on the energy separation in a vortex tube

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