Regime Map of Binary Particle Mixture in a Spout-Fluid Bed

Abstract

Experiments were carried out in a half-column of a spout-fluid bed, incorporating the central flow in addition to the auxiliary side flow. A binary particle mixture containing coarse and fine glass beads was investigated.
Six different flow patterns-such as spouting with aeration (SA) and spout-fluidization (SF) -were identified and mapped as regimes depending on the relative values of the central and the auxiliary air flow rates. Also, compared with the regime map for coarse particles only, it was recognized that a binary-particle mixture made the amount of gas flow to form SA or SF region small, but the operation range for SA or SF became narrow and the size segregation in the direction of radius appeared.