Abstract
Flow pattern transition is one of the most important mechanisms in fluidization technology. By employing the computational fluid dynamics-discrete element method simulation and high-speed photography experiments, the influence of the fluidization velocity on the flow pattern in a fluidized bed was studied. With the increase of the fluidization velocity, the flow pattern transformation undergoes three processes: bubble fluidization; a state dominated by bubble fluidization along with slugginging fluidization; and a state in which bubble fluidization and turbulent fluidization coexist. Pressure fluctuations at different height positions in the fluidized bed were measured, and the intrinsic connection between the pressure fluctuations and flow pattern transition process was analyzed. It was found that the bed pressure fluctuations and the change in the number of bubble fragmentations can be used as important discriminative indexes for the transformation of bubble fluidization into turbulent fluidization. The discriminant formula for the internal flow pattern of the fluidized bed was established. These findings could serve as the reference for discriminating the flow pattern of fluidized beds.
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