Visualization Study of the Effect of the Prolonged Vertical Tube on the Separation Performance of a Cyclone

Cyclones have been widely used in different industrial processes. The most widely used experimental observation techniques for the flow pattern include Pitot tubes; hot‐wire anemometers, as well as the non‐intrusive techniques such as laser Doppler anemometry (LDA). However, all these available techniques have the limitation of only one‐point measurement at a time, by which the whole‐field fluid characterization in cyclones cannot be obtained simultaneously. Particle image velocimetry (PIV) is a novel non‐intrusive visualization experimental technique to measure the whole‐field three‐dimensional fluid velocity instantaneously. However, only a few papers that examined the flow pattern in cyclones with PIV have been found. The objective of this work is to carry out an elementary experimental investigation of the effect of the prolonged vertical tube on the separation performance of a cyclone by PIV. Since the tangential velocity results in the centrifugal force for particle separation, and is regarded as th...