Characteristics of Fluidized Bed under Oscillation

Abstract

ΔP-u relation, minimum fluidization velocity (u_mf), bed voidage at minimum fluidization point (ε_mf), bed expansion and pressure drop of bed were examined experimentally in a fluidized bed under oscillation. Effects of the oscillation were clarified by varying periodic time of oscillation, maximum inclination angle from vertical axis, length from a fulcrum to a distributor and bed width. Diagrams of ΔP vs. u were classified into several types by oscillating conditions and bed width. Violent oscillation reduced u_mf and ε_mf. By inclining or oscillating the bed, bed expansion was suppressed, and variation in bed height or pressure drop of bed was increased. Inclination or oscillation of the bed gave rise to channelling and slugging in the bed.