Agglomerating Vibro-fluidization Behavior of Binary Nanoparticles Mixtures

Abstract

The agglomerating fluidization behavior of different binary mixtures of SiO2/TiO2, SiO2/ZnO and TiO2/ZnO nanoparticles in vibro-fluidized bed (VFB) was performed. The results showed that the bed of nanoparticles existed obviously channeling and crack formation at lower gas velocities and slowly disappeared with increasing superficial gas velocity, and then the bed reached homogeneous fluidization state at the minimum fluidization velocity under certain amplitude (3mm) and frequency (40Hz) of vibrations applied. The mean agglomerate size of binary mixtures of SiO2/TiO2, SiO2/ZnO and TiO2/ZnO nanoparticles sampled at the top of the bed was 224μm, 187μm and 148μm, respectively. The mean agglomerate sizes predicted by the Richardson-Zaki equation combined with Stokes law were in agreement with those determined experimentally in VFB.