In order to find out the vortex tube configuration with the best cooling temperature difference

nozzles with different Mach numbers were designed and manufactured

the experimental system was set up and the performances of these nozzles were measured.The result shows that the vortex tube has better energy separation effect with outlet Mach number between 0.5 and 0.8.But when the Mach number is up to 0.9

the effect would be worse.The refrigeration performance of the vortex tube with the outlet Mach number of 0.8 is best from 0.4 to 0.6MPa in inlet pressure

but the performance difference varied little with input pressure over 0.6MPa.