Particle-particle interactions during normal flow filtration: Model simulations

Myung Man Kim, Andrew L. Zydney

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Although particle trajectory calculations have been used previously to analyze the behavior of membrane systems, these studies have ignored the effects of particle-particle interactions. Particle motion was evaluated by numerical integration of the Langevin equation accounting for the combined effects of electrostatic repulsion, enhanced hydrodynamic drag, Brownian diffusion, and interparticle forces. In the absence of Brownian forces, particles are unable to enter the pore unless the drag force associated with the filtration velocity can overcome the electrostatic repulsion. The presence of a second particle alters the particle trajectories, forcing the particles to attain equilibrium positions located symmetrically about the pore centerline. Interparticle forces can effectively push the particle over the energy barrier, significantly reducing the magnitude of the critical filtration velocity required for particle transmission. Brownian forces also allow particles to enter the pore, with the particle transmission increasing with increasing filtration velocity.

Original languageEnglish (US)
Pages (from-to)4073-4082
Number of pages10
JournalChemical Engineering Science
Issue number15
StatePublished - Aug 2005

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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