Optimization of low pressure vortex tube via different axial angles of injection nozzles

In this article, a Ranque-Hilsch Vortex Tube has been optimized utilizing axial angles for nozzles. Effect of nozzles angles on the flow behavior has been investigated by computational fluid dynamics (CFD) techniques. A finite volume approach with the standard k-ε turbulence model has been used to carry out all the computations. The dimensions of the studied vortex tubes have been kept the same for all models and the performance of machine was studied under 5 different angles (β), namely 0, 2, 4, 6 and 8 degree adjusted to the nozzles. Achieving a minimum cold exit temperature is the maingoal of this numerical research. The results show that utilizing this kind of nozzle improves the cooling capacity of device for most values of inlet mass flow rates. Finally, some results of the CFD models have been validated by the available experimental datawhich show reasonable agreement, and other ones are compared qualitatively.