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Fluidization mechanism of ultrafine particles with sound assistance
WANG Ming-hua, GUO Qing-jie, CHEN Shuang
(College of Chemistry and Chemical Engineering in China University of Petroleum,Dongying 257061, Shandong Province,China )
Abstract:
The fluidization behaviors of SiQj particles were investigated in a fluidized bed of 56 mm in inter-diameter under different sound pressure levels. The sound wave is generated by a loudspeaker located above the bed, and its sound pressure level (SPL) varies from 90 to 105 dB. The effects of sound wave on the fluidization behaviors and agglomerate size were discussed. Based on the analysis of energy balance of cohesive agglomerates in a fluidized bed with sound assistance, an energy balance model was developed. The results show that the acoustic field can diminish slugging, restrain channels, reduce minimum fluidization velocities and agglomerate size, and dramatically improve the fluidization quality when the sound pressure level exceeds 100 dB. The diameter of SiC>2 particle agglomerate is decreased with an increase in sound pressure levels at a given sound frequency.
Key words:  agglomerate  sound pressure level  sound frequency  cohesive force  nanoparticle