Abstract
In fluidized beds of fine particles, minimum fluidization velocity Umf, voidage of the emulsion phase εe and sedimentation velocity Us were measured for various gas-powder systems. For both Umf and Us, the relationship between velocity and voidage was experimentally determined on the basis of the Richardson-Zaki equation. The voidage of the emulsion phase was correlated by a dimensionless parameter taking into account the effect of gas density. By using this correlation and the relationship between velocity and voidage obtained in this study, Us was expressed as a function of Umf. The calculated Us from Umf agreed with the experimental data.
