Small disturbance diagnostic inside the vortex tube with a square cross-section

The vortex effect in Ranque-Hilch vortex tube was investigated. Being discovered by G.J. Ranque[1] in l928, the effect still has no adequate generally accepted physical explanation. One of the reasons is connected with the lack of reliable experimental data describing velocity and temperature distributions inside the vortex tube. The sensors mounted inside the vortex tube contribute conspicuous perturbation in the flow. Therefore, the new measuring methods should be searched that do not or slightly disturb the flow. For this purpose, optical techniques are the most suitable. In order to use optical methods the vortex tube with square section was applied. The flow kinematics investigation inside the Ranque-Hilsch tube was carried out using a laser Doppler anemometer (LDA) with an adaptive temporal selection of the velocity vector (LAD-056). The measurements of vector components of the swirling flow velocity were carried out in close to the hot output section of the Ranque-Hilsch tube at a working pressure ...