WORKING GASES CHARACTERISTICS' INFLUENCE ON ENERGY SEPARATION OF THE VORTEX TUBE

摘要

The vortex tube is an effective energy separation device, which is structurally simple and has no moving parts.rnAt present, the research of working gases' influence ,especially for HFCs, on energy separation of vortex tubernis few. Based on this, a vortex tube performance device is designed. In the experiment, R728, R744, R32, R22,rnR161, R134a are selected as working fluids. The inlet pressure of the vortex tube is changed from 0.2MPa torn0.8MPa(abs), and the inlet temperature of the vortex tube is controlled about 12℃. The performance of thernvortex tube for cooling, heating and energy separation with different working fluids is tested. When R728 andrnR744 is chose as working gas, it is found that the value of temperature separation and outlet pressure increasernwith the rise of inlet pressure, but there is an extreme value for R744 when inlet pressure is about 1.1MPa.rnThrough comparing experimental data of different working gases, three fluid characteristics: thermalrndiffusivity, kinematic viscosity, thermal conductivity are considered as the main influence factors of energyrnseparation in the vortex tube. The isenthalpic throttling effect of working fluid itself will also affect the coolingrneffect of vortex tube. In addition, the wall temperature of vortex tube hot-side is measured, the phenomenon ofrnthe cold end in vortex tube is observed, conditions for the liquefying phenomenon using HFCs are discussedrnand roughly given.