A study has been made of the effect of both the geometric factors of the contactor (base angle and gas inlet diameter) and the experimental conditions (stagnant bed height, particle diameter, and gas velocity) on the trajectories of the particles in the three zones (spout, annulus, and interface) of spouted beds. The trajectories have been determined from the experimental results of the vertical component of the particle velocity measured by means of an optical fiber probe. Cycle time distributions have been calculated from the trajectories, and they have been compared with the experimental results obtained by monitoring colored particles using video-imaging treatment. Original correlations have been proposed for calculating the average cycle time from the geometric factors and experimental conditions.