A New Method for the Measurement of Solids Time-averaged Velocity in Gas-Solid Two-phase Flow
气固两相流中颗粒时均速度的测量新方法

A new method for calculating time-averaged particle velocity was presented based on the cross- correlation technique. Compared with the other two calculating methods presented by Aguillon and Nieuwland, the new method considers not only the differences between the upward and downward particle element velocities and numbers, but also the differences of particle element concentrations. The measurement of particle time-averaged velocity was completed by using a PV4A optical fiber probe in a cold model set-up of circulating fluidized bed for the sake of ascertaining the differences between the new one and the others. The results show that the differences between them were negligible under higher superficial gas velocity and lower cross-sectional average particle concentration, while the differences were remarkable under lower superficial gas velocity and higher cross-sectional average particle concentration.