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Sound Assisted Fluidized Bed (SAFB) of group B particles (180μm glass bead)  has been studied in a 46mm I.D. column with aspect ratios of 1.4 and 2.9. A  loudspeaker mounted on the top of the bed was supplied by a function  generator with square wave to generate the sound as the source of vibration  of the fluidized bed. The sound pressure level (referred to 20μpa) was varied  from 102 to 140dB and frequencies from 70Hz to 170Hz were applied. The  effects of sound pressure level, sound frequency and particle loading on the  properties of SAFB were investigated. The experimental result showed that the  minimum fluidization velocity decreased with the increase in sound pressure  level, also minimum fluidization velocity was varied with variation of  frequencies. At resonance frequency minimum fluidization velocity was found  to be minimum. The bed height did not show an appreciable increase in  presence of high acoustic field and at resonant frequency. Minimum  fluidization velocity verses frequency curve in presence of sound intensity  varied with variation of bed weight.

The influence of acoustic field and frequency on hydrodynamics of group B particles