The hydrodynamics of Newtonian and Non- Newtonian fluids in gas- liquid- solid fluidized bed in riser were studied. The circulation conditions for light and heavy particles were compared. The effects of gas and liquid flow rates

liquid viscocity

solid holdup and particle characteristics on gas holdup and liquid circulation rate were investigated. The difference between gas holdup in riser and that in the annular region and the influence of this difference on liquid circulation rate were studied. By introducing the generalized Reynolds number

the correlations for calculating riser and annular gas holdup for both Newtonian and non-Newtonian fluids were obtained.