AbstractExperimental data are reported on velocities of entrainment in liquid fluidized beds. Single as well as multicomponent mixtures of solids varying in size and/or density have been investigated. By drawing an analogy with partially fluidized bed systems, phase equilibrium diagrams of binary and ternary mixtures have been constructed and presented. Correlations have been developed for the prediction of velocities related to the beginning of entrainment, minimum entrainment and complete entrainment.