In the present study the hydrodynamic characteristics (bed expansion and pressure drop) of low-density polyethylene (LDPE) and polypropylene (PP) are studied in a liquid-solid inverse¯uidized bed reactor as a function of particle diameter, liquid viscosity and density. The bed expansion and pressure drop data are used to determine the minimum¯uidization velocity, U mf and friction factor, ¦. It was found that the U mf increased with an increase in the particle diameter and a decrease in solid density and was independent of initial bed height (solid loading). In addition, the U mf decreased with an increase in the CMC concentration. The friction factor Reynolds number plot was found similar to that of classical¯uidization. Dimensionless equations were proposed for the. prediction of the friction factor and the U mf .
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