An experimental study on swirling flow in a cylindrical annuli using the PIV technique

摘要

An experimental investigation was conducted to study the characteristics of turbulent swirling flow in an axisymmetric annuli. The swirl angle measurements were performed using a flow visualization technique using smoke and dye liquid for Re = 60,000-80,000. Using the two-dimensional particle image velocimetry method, this study found the time-mean velocity distribution and turbulent intensity in water with swirl for Re = 20,000, 30,000, and 40,000 along longitudinal sections. There were neutral points for equal axial velocity at y/(R - r) = 0.7-0.75, and the highest axial velocity was recorded near y/(R - r) = 0.9. Negative axial velocity was observed near the convex tube along X/(D - d) = 3-23.