Abstract
Measurements of particle velocity and concentration profiles for a swirling gas-solid flow in a vertical pipeline with a height of 12m and an inner diameter of 80mm have been performed by photographic methods. Polyethylene pellets with mean diameter of 3.2mm were used as test particles. The initial swirl numbers were varied from 0.38 to 0.94, the mean air velocities from 9m/s to 25m/s and the solid-gas ratios from 0.2 to 0.7. It was found that in the acceleration region the mean particle velocity for the swirling gas-solid flow was higher than that for the axial gas-solid flow in the lower air velocity range and was lower in the higher air velocity range. Along the axial direction the change of the mean particle velocity for the swirling gas-solid flow was larger than that for the axial gas-solid flow in the acceleration region. With swirling flow, the particle velocity profiles became uniform.
