PIV Measurement of the Fluidized Particles’ Velocity Field in a Cylindrical Spouted Bed

Abstract

In this paper, the instantaneous velocity fields of the particles in the spouted bed were measured by the particle image velocimetry (PIV). In the experiment, the spouted particles achieved the visible accumulation effect when the fountain height was 0.85 times of the packed bed height h. Since the particles are dispersed with each other, the PIV recordings were evaluated by the multiple-pass recursive method based on the FFT cross-correlation algorithm. The time-averaged velocity field of the particles obtained from the PIV experiment had similar distribution with the velocity field calculated by the numerical simulation. In the averaged particle velocity field, there was a continuous region which divided the whole flow field into two parts. The particle velocities in the region approximated to zero especially in vertical direction, which means the particles with upwards motion were basically equated to those with downwards motion in the region. Therefore the effects of particles’ face-to-face friction and even abrasion were much stronger in the region. Further, the experimental results also show that the area of the region could be about 11.19% of the whole flow field.