Lateral solid particles mixing in a centrifugal fluidized bed.

Abstract

The lateral mixing of solid particles in a centrifugal fluidized bed in which the rotation axis is horizontal was investigated from the unsteady-state behavior of tracer particles. The lateral mixing characteristics were analyzed by a diffusion model identical to that for a conventional fluidized bed. The lateral dispersion coefficient of particles was affected by variables such as gas velocity, rotational speed of the rotor, particle diameter, bed height and minimumfluidized velocity. From the experimental results an empirical equation for the coefficient was obtained. Its value for a centrifugal fluidized bed wassmaller than that calculated from empirical equations for a conventional fluidized bed, because of smaller bubble diameter and bed height, centrifugal force, and the like.

Modeling and measurement of bubble size in a rotating fluidized bed

“…The particle mixing has been investigated by Kroger et al18 and Qian et al19 However, they only reported the effect of gas velocity on the particle mixing, never mentioned the effect of other operating parameters. Takahashi et al20 has just reported the empirical correlation for prediction of the coefficient of lateral particle dispersion under various operating parameters. Recently, fluidization behavior of fine particles has been reported by Matsuda et al12 and Quevedo et al13 They analyzed the fluidization behavior of nano‐agglomerates and proposed the model of the agglomerate size in a high‐centrifugal force field.…”