The fluidization characteristics of SiO2, Al2O3, and TiO2 nanoparticles with the assistance of vibration at different frequencies and amplitudes are studied in a plexiglass fluidized bed with the inner diameter of 40 mm. The effects of vibration on fluidization of nanoparticles with different cohesiveness are compared. The results show that, without vibration, the SiO2 nanoparticle agglomerates are fluidized smoothly while the Al2O3 and TiO2 nanoparticle agglomerates are fluidized with segregation because there are large agglomerates at the bottom of the fluidized bed. When the vibration is introduced, the minimum fluidization velocity of SiO2 decreases,and the bed expansion ratio of SiO2 decreases with the increase of amplitude and frequency. For the Al2O3 and TiO2 nanoparticles, as the amplitude and frequency increase, the minimum fluidization velocity decreases, the bed expansion ratio increases, and the agglomerate size decreases at the bottom of the fluidized bed. However, the vibration makes no significant improvement in fluidization at low frequency and low amplitude for the Al2O3 and TiO2 nanoparticles. Vibration enhances the collision of nanoparticle agglomerates and has the dual effect of promoting the breakage and compaction of the agglomerates. The optimal vibration parameters need to be explored to achieve the optimal fluidization quality of different nanoparticles.
ZHAO Zhiduan
,
LIU Daoyin
,
MA Jiliang
,
CHEN Xiaoping
. Experimental study on fluidization of nanoparticle agglomerates with the assistance of vibration[J]. Journal of University of Chinese Academy of Sciences, 2020
, 37(2)
: 204
-209
.
DOI: 10.7523/j.issn.2095-6134.2020.02.009
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