Axial dispersion Characteristics in the cocurrent two- phase (liquid- liquid) and three- phase (liquid- liquid- solid) fluidized beds have been studied in 7.62 cm- ID × 192 cm- height pyrex glass column.
Kerosene and water were used as the dispersed and continuous phase, respectively. Glass beads were used as the solid phase in three phase fluidized beds.
Effects of dispersed phase velocity (0 - 3.5 cm/s), continuous phase velocity (1.0 - 8.0 cm/s), and particle size on the axial dispersion coefficient have been determined.
Axial dispersion coefficient of the continuous phase have been measured by means of a pulse tracer injection technique with the axially dispersed plug flow model.
In cocurrent two phase flow system, axial dispersion coefficient increased with the dispersed and continuous phase velocities.
In three phase fluidized beds, axial dispersion coefficient increased with the dispersed and continuous phase velocities but it decreased with the particle size. Also the mixing length increased with continuous velocity, while it decreased with the particle size.
Axial dispersion coefficient in three phase fluidized beds found to be greater than that in two phase system.
