In this paper numerical simulation of a three dimensional compressible turbulent flow was made using computational fluid dynamics (CFD). The present work presents a numerical investigation of flow and temperature separation behaviors inside a flow vortex tube with helical nozzles. The CFD model is a steady axisymmetric with periodic boundary condition that uses the k–ε turbulence model. Different turbulence models involve K-ε, K-ω and SST were investigated in this study. 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 temperature difference were compared. The numerical values of hot and cold outlet temperature differences indicate the considerable operating role of helical nozzles, even for a few numbers of that in comparing with straight nozzles. The results show that, this type of nozzles causes to form higher swirl velocity in the vortex chamber than the straight one. Although the best form of helical profile was selected for nozzles in order to obtain the cooler outlet air.The grid independence study was done too. The performance curves (hot and cold outlet temperature differences versus cold outlet mass fraction) obtained by using this model is compared with the experimental results. The temperature separations obtained from this study were in good agreement with available data for comparison at a similar scale of operating conditions.
کلید واژگان :Energy Separation, Helical Nozzles, Vortex Tube, CFD Simulation
ارزش ریالی : 300000 ریال
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