Experiments on the dynamics of fast fluidization were carried out in a 100mm-diameter plexiglas column

8 meters in height

on FCC catalyst

alumina powder

iron ore concentrate and fine pyrites cinder. Based on the rapid formation and dissolution of dense strands or clusters of solids dispersed in a continuum of dilute phase

a physical flow model of fast fluidization has been proposed leading to a first-order differatial equation

the solution of which yields a four-parameter equation of voidage distribution along the bed height z The integrated average voidage e throughout the whole bed height may be calculated by the following formula It has been found that computed values are in good agreement with those determined experimentally.