Relationship between the Onset of Semi-fluidization Velocity and the Minimum Fluidization Velocity

Abstract

SEMI-FLUIDIZATION, a recent development in the field of fluid-solid contact operations,

is highly suitable for mixed and tubular re- actors 1 . A semi-fluidized bed is a compromise be-

tween the packed and the fluidized bed conditions,

eliminating certain drawbacks of both these opera- tions2. The introduction of a porous disc or sieve

in a conventional fluidizer arrests the free upward

motion of the particles and results in the formation

of a semi-fluidized bed consisting of a top packed

section and a bottom fluidized portion.