EMULSION PHASE EXPANSION AND SEDIMENTATION VELOCITY IN FLUIDIZED BEDS OF FINE PARTICLES

抄録

In fluidized beds of fine particles, minimum fluidization velocity U_mf, voidage of the emulsion phase ε_e and sedimentation velocity U_s were measured for various gas-powder systems. For both U_mf and U_s, 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, U_s was expressed as a function of U_mf. The calculated U_s from U_mf agreed with the experimental data.