Abstract
Fluidization hydrodynamics of uncharged, bed-charged and pre-charged particles was studied experimentally. Charge accumulation in the bed-charged case exhibits a linear trend against the excess gas velocity, regardless of the particle sizes. By charge accumulation on particles, minimum fluidization velocity increases while transition velocity to turbulent fluidization decreases. In the case of pre-charged particles, minimum fluidization velocity is higher than that of bed-charged particles and their transition velocity is higher. These trends can be explained with electrostatic forces which affects the bed voidage and bubble formations. The developed model confirms the effect of initial charge of particles on the bed voidage.
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