Theoretical Approach to Concentration Distribution and Adhesion Efficiency of Fine Particles Around a Rising Bubble in Slurry Systems  

作　　者：蔡旺锋 许春建 周明 

出　　处：《Chinese Journal of Chemical Engineering》2002年第5期550-557,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 20126010).

摘　　要：Quantitative prediction of distribution function and adhesionefficiency of particles around a rising bubble in slurry systems ispresented in this work. By solving the convection-diffusion equation(Fokker-Planck equation), the influence of Brownian diffusivity offine particles on concentration distribution and adhesion efficiencyis demonstrated with the hydrodynamic force and van der Waalsattractive potential between particles and bubble considered. It isfound that two kinds of mechanism dominate the adhesion process ofparticles on bubble according to different Peclet number or size ofparticles and bubble, as well as other properties of the slurrysystems. In addition, the viscosity ratio of bubble to the suspendingfluid was found to have obvious influence on particle adhesion.Quantitative prediction of distribution function and adhesion efficiency of particles around a risingbubble in slurry systems is presented in this work. By solving the convection-diffusion equation (Fokker-Planckequation), the influence of Brownian diffusivity of fine particles on concentration distribution and adhesion efficiencyis demonstrated with the hydrodynamic force and van der Waals attractive potential between particles and bubbleconsidered. It is found that two kinds of mechanism dominate the adhesion process of particles on bubble accordingaddition, the viscosity ratio of bubble to the suspending fluid was found to have obvious influence on particleadhesion.

关 键 词：adhesion efficiency Brownian diffusivity distribution function Fokker-Planck equation 

分 类 号：TQ021[化学工程]