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浆料系统内上升气泡周围微细颗粒浓度分布和附着效率的理论研究

蔡旺锋; 许春建; 周明   

  1. Chemical Engineering Research Center, Tianjin University, Tianjin 300072, China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2002-10-28 发布日期:2002-10-28
  • 通讯作者: 蔡旺锋

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

CAI Wangfeng; XU Chunjian; ZHOU Ming   

  1. Chemical Engineering Research Center, Tianjin University, Tianjin 300072, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2002-10-28 Published:2002-10-28
  • Contact: CAI Wangfeng

摘要: 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

Abstract: 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.

Key words: adhesion efficiency, Brownian diffusivity, distribution function, Fokker-Planck equation