Convective Particle Motion for Fine Particle Bed under Mechanical Bed Vibration

Abstract

The characteristics of particle motion behavior in a gas-solid fluidized bed for fine cohesive particle under mechanical bed vibration were experimentally investigated. In this study, spherical zirconia particle whose mean diameter and density were 8.2 μm and 5680 kg/m³ was used as a fluidizing material. Vertical vibration was added to the fluidized bed and the vibration parameters (vibration frequency and amplitude) were varied. From the observation of particle flow patterns in the bed, the flow pattern in the bed was gradually changed with the magnitudes of the gas flow rate and the vibration parameters. When the vibration amplitude was higher than a certain magnitude, the bed surface formed inclined plane while the particles migrated on the inclined bed surface. Then, with further higher vibration amplitudes, the heap shape was formed on the bed surface with particle migration. The particle migration velocity was increased as the vibration amplitude increased. In this study, we successfully obtained the map of flow pattern for bed of fine particle under mechanical bed vibrating condition.