Core-Type Segregation in a Tapered Fluidized Bed of Binary Particle Mixtures

Abstract

In the case of a binary particle mixture fluidized in a tapered column, a partially fluidizing region was observed at velocities between incipient fluidizing velocity u_bf and perfect mixing velocity u_pf, as observed in conventional fluidized beds with a uniform cross-sectional area. Jetsam particles segregated to the bed tottom. The bed formed core-type segregation that was greatly different from that of conventional beds. In this work, characteristics of such core-type segregation were studied. For this purpose u_bf and u_pf were measured and estimated as well as segregation patterns at various conditions.
It was found that the segregation tendency in a tapered bed was stronger than that in a conventional bed. This tendecy was evaluated by segregation index S.