G0510403 Pitot Pressure Measurement at Cold Exit of Vortex Tube

Abstract

Vortex tube (VT) is a simple mechanical device which separates cold and hot streams from room-temperature compressed gas. Generally, the VT can produce cold stream down to around -30℃ and hot stream up to around 130℃. The flow properties inside and outside of the vortex tube are important in order to elucidate the temperature separation phenomenon, which is not fully understood. In this research, Pitot pressure probe is used to measure the pressure of the cold exit. Pitot pressure probe was inserted along the central axis of the cold exit. The pressure is measured in the range of 0-15mm from the cold exit. The results shows the Pitot pressure is negative at the cold exit at a cold fraction ε< 0.53, and inlet pressure at 0.2 and 0.3MPa.