Propagation and attenuation of acoustic in gas-solid fluidized beds of group B particles

Abstract

The introduction of an acoustic field can change the hydrodynamic behavior of solid particles in gas-solid fluidized beds, and in turn, the quasi-fluid in fluidized beds affects the acoustic propagation characteristics, such as the attenuation of acoustic waves in the fluidized-bed particle swarm. In this work, we investigated the transmission and attenuation process of sound waves in the fluidized bed of group B particles in the acoustic frequency range from 50 to 500 Hz. The obtained results show that there are three different attenuation stages during the propagation of acoustic waves through the fluidized bed with group B magnetite powder particles. The sound pressure level distribution model is extended to the sound-assisted fluidization of group B particles, and the prediction of the transmission and attenuation process of sound waves in the fluidized bed is in good agreement with the experimental values with an error below 5%.