one can find that the increasing
sound pressure level results in a reduction in agglomerate
size. As discussed above, the ultrafine particle agglomerate in
a fluidized bed is characterized by a dynamic process [1,2,9]
consisting of agglomerate growing and agglomerate disrupting.
The external energy input by sound wave aids to break
up the ultrafine particle agglomerates, causing a small average
agglomerate diameter. Whereas, the sound wave increases
the contact possibility of between particles and agglomerates,
which causes a large agglomerate size. In an acoustic fluidized
bed, the former effect dominates at a low sound pressure
level; the latter effect dominates at high sound pressure
leve