Fluidization Characteristics of SiO2 Nanoparticles in an Acoustic Fluidized

Under the action of an acoustic field, the fluidization behavior of 5-10 nm SiO 2 nanoparticles, with and without surface modification, was investigated. In a packed bed, the sound wave energy has a significant influence on the compact ratio of the bed. Experimental results indicated that the bed of nanoparticle agglomerates can be fluidized smoothly with the assistance of an acoustic field, and the minimum fluidization velocity is initially reduced dramatically with increasing sound frequency and then rises with increasing sound frequency. Under the same experimental conditions, the minimum fluidization velocity of 5-10 nm SiO 2 nanoparticles is greater than that of 5-10 nm SiO 2 nanoparticles with surface modification. The collapse of the bed demonstrates that SiO 2 nanoparticles, surface modified using organic compound, have longer minimum collapse times than SiO 2 nanoparticles.