Bed expansion and average bubble rise velocity in a gas-solid fluidized bed

摘要

A model for bed expansion of a gas-solid fluidized bed is proposed. Bed expansion is found to depend on excess fluidization velocity, and the geometry and physical properties of the bed and the particles. An expression for predicting the average velocity of an isolated bubble in a gas-solid fluidized bed, which is based on the bed expansion model, is also presented. The predictions of the proposed models agree well with experimental measurement.