| Abstract: | A transducer pressure probe is devised to measure the pressure‐history curves up to a maximum frequency of 200 Hz. It is installed on the wall of a 153 mm2 fluidized bed and is employed to establish the solids mixing and movement pattern of an air fluidized bed comprising of glass beads of 2093 μm average diameter. The pressure variations recorded with a speed of about 11 Hz for a period of 92 s are employed to compute several statistical functions and analysed to infer the quality of fluidization. For the range of fluidization number 1.05–1.48, it is inferred that in this bubbling regime, the solids near the bed wall region descend down while the air bubbles drift to the central region and rise up in the fluidized bed. This bulk macroscopic hydrodynamic picture of solids movement is in conformity with the conclusions of other co‐workers. Copyright © 2000 John Wiley & Sons, Ltd. |
