JIANG Hong 1, LUO Hongbin 1, 2, ZHOU Jianzheng 1, 2
(1. School of Mechanical and Electronic Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China; 2. Jiangxi Engineering Laboratory for Ceramic Materials Processing Technologies, Jingdezhen 333403, Jiangxi, China)
Abstract: In order to improve the performances of Si3N4 microspheres prepared by using multi-dimensional rotating coupling field, the effect of homogenization-granulation combination on the flow field distribution in the multi-dimensional rotating coupling chamber was studied. The Euler-Euler gas-solid two-phase flow model was established and the physical model of multidimensional rotating coupling chamber was simplified. The influence of different homogenization-granulation combination on the flow field distribution of the Si3N4 microspheres was analysed. The numerical simulation structure shows that the 18-8 homogenization and granulation structure has good granulation effect. In the radial volume distribution and axial volume distribution cloud images, the particle distribution is uniform and has good mixing effect. In the radial volume distribution cloud image, the volume distribution mainly concentrates in 0.77-0.78, accounting for 70% of the total area. It is mainly distributed in 0.70-0.80, accounting for 69% of the total area. The Si3N4 microspheres prepared with the combination of 18-8 homogenization and granulation had the most perfect sphericity and fluidity, while the qualified rate of the microspheres reached 94.3%. Experimental results further verify the correctness of the numerical simulation.
Key words: multi-dimensional rotating coupling field; Si3N4 microspheres; homogenization-granulation combination; volume flow field distribution; velocity flow field distribution