纳米颗粒振动床中聚团大小的计算模型

In this study, the fluidization behavior of SiO2 nano-particles and the effects of vibration parameters on size of agglomerates have been systematically investigated in a bed of 40mm in diameter. Base on Richardson-Zaki equation and Stokes law, a mathematical model was developed in use of studying vibrating fluidization with nano-particles. According to these experimental results slugging and channeling of bed disappeared, the minimum fluidization velocity is reduced, the measured agglomerate size is decreased and fluidization quality was significantly improved due to introduction of vibration energy. The effect of vibration on agglomeration in fluidization of nano-particles is two-sided. Compared with vibration amplitude, vibration frequency has a comparatively significant effect on agglomerates’ size. The sizes of agglomerates of the predicated values and the experimental data decreased with increasing vibration intensity, and were agreement well with each other under vibration condition. In addition, the degree of the size-segregation of the agglomerates decreased with increasing vibration intensity.