Fluidlike Fluidization as Affected by External Fields
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Fluidlike fluidization of fine powders is directly related to the formation of dynamic aggregates. This aggregation process may be influenced by external fields. In the case of oscillating fields, such as in an alternating electric field if particles are electrostatically charged or in oscillatory vibration, the aggregates are forced to oscillate, which affects their hydrodynamic interaction with the surrounding fluid. This chapter is devoted to a review of empirical observations and modeling on the effect of these fields on fluidization of fine powders. Additionally, external excitation may help in the case of Geldart C powders to overcome cohesive aggregation and turn the heterogeneous fluidization behavior into a fluid-like behavior.
KeywordsSettling Velocity Particle Volume Fraction Splash Zone Effective Acceleration Charge Relaxation Time
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