A bimodal particle dynamics model considering coagulation,coalescence and surface growth,and its application to the growth of titania aggregates

摘要

A simple bimodal particle dynamics model was proposed to describe a particle system undergoing simultaneous particle formation,coagulation,coalescence,and surface growth.We extended our previous bimodal model,which used two discrete modes,to account for the surface growth of nonspherical particles.Surface reaction from TiCl_4 was considered and its effects on the formation and growth of TiO_2 particles were investigated.Simulation results of the present bimodal model considering surface growth showed very good agreement with those of the moving sectional model for the growth of spherical TiO_2 in the literature.Surface growth of TiO_2 aggregates was also simulated by using this bimodal model and a new design diagram indicating the significance of surface reaction of TiCl_4 was proposed.