Fluidization is a process in which solid particles are suspended in a fluid-like form subject to several forces acting on them.These forces include gravity,buoyancy,and drag.Particles are grouped according to their mean particle size and density in a classification proposed by Geldart(1973)who classified these particles into four different groups(A,B,C and D)for particle densities of typical particles under room temperatures and pressure.Group A(Aeratable)has an average particle size of-30-100 microns.Group B(Bubbling)has an average particle size of ~ 100-1000 microns; whereas,Group C(Cohesive)has an average particle size of less than ~ 30 microns and Group D(Spoutable)has an average particle size of more than ~ 1000 microns.
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