The
average bubble diameter and volumetric bubble flux give indications
about the overall bed expansion in a fluidized bed. As these properties
depend on the particle properties and fluidized bed regime, their
accurate predictions have been a challenge. A new set of models for
predicting the average bubble properties within the bubbling and slugging
regimes in a deep fluidized bed is proposed, where bubble flux is
modeled by
, bubble
diameter is modeled by
and transition
velocity is modeled by
. The models are developed using the information
obtained from an experimental setup equipped with a dual-plane electrical
capacitance tomography and a porous distributor plate. Although they
are empirical, the proposed models are based on the two-phase theory
used in describing the bubble flow in a fluidized bed. These models
have been validated, and the results show that they can be used to
predict the behavior in different regimes at different gas velocities.
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