An exptl. investigation was carried out on velocities and amplitudes of pressure disturbances in fluidized beds made of 100-200 m glass ballotini. Disturbances were originated by gas jetting in a 0.35 m internal diam. fluidized bed. A fluidization tube 0.10 m internal diam. has also been used. Different types of disturbances were induced in the bed contained in this tube: injection of a freely rising bubble and of a captive bubble, injection of a bubble chain, and compression of the bed free surface. The dynamic wave character of the disturbances has been shown. Velocities and amplitudes of waves moving through the beds were measured. In particular, wave velocities were compared with theor. results obtained by the application of pseudohomogeneous and sepd. phase flow models.
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