WU Nanxing, ZHAN Tiantian, LIAO Dahai

(School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)

Abstract:In order to make the atomized droplets fully contact with the powder in the process of dry granulation and to improve the uniformity of particle size, the mathematical model of the atomization process is established based on the DPM model in the Euler-Lagrange systems with the help of the simplified physical model for a test dry granulator.And the particle diameter distributions of different nozzles are compared and analyzed. The simulation results show that the droplet dispersity increases with the order from air-blast-nozzle, plain-orifice-nozzle, pressure-swirl-nozzle to effervescent-nozzle. But the droplets average particle size of pressure-swirl-nozzle is less than those of the other three kinds of nozzles and droplets inside the granulation chamber are dispersed more uniformly and thus more conducive to a good contact between droplets and powder. 

Key words:dry granulation; DPM.; atomization; numerical simulation