TY - JOUR
T1 - Theoretical analysis of particle trajectories and sieving in a two-dimensional cross-flow filtration system
AU - Kim, Myung man
AU - Zydney, Andrew L.
N1 - Funding Information:
Support for this work was provided in part by grant CTS-0091552 from the National Science Foundation. The authors would also like to thank Professor Ali Borhan for assistance with FLUENT.
PY - 2006/9/15
Y1 - 2006/9/15
N2 - Particle deposition and fouling are critical factors governing the performance of microfiltration systems. Particle trajectories in cross-flow filtration were evaluated by numerical integration of the Langevin equation accounting for the combined effects of electrostatic repulsion, enhanced hydrodynamic drag, Brownian diffusion, inertial lift and van der Waals attraction. The membrane remains completely free of particles below a critical filtration velocity due to the electrostatic repulsion between the charged particles and the charged membrane. This critical flux increases with increasing surface potential and decreasing ionic strength due to the increase in electrostatic repulsion. The critical flux also increases with increasing wall shear rate due to the reduction in residence time over the pore. Brownian motion provides a random character to the particle trajectories, allowing particles to enter the pores even at operation below the critical flux. Particle transmission increases with increasing filtrate flux and ionic strength, and decreases with increasing particle size, wall shear rate and electrostatic potential.
AB - Particle deposition and fouling are critical factors governing the performance of microfiltration systems. Particle trajectories in cross-flow filtration were evaluated by numerical integration of the Langevin equation accounting for the combined effects of electrostatic repulsion, enhanced hydrodynamic drag, Brownian diffusion, inertial lift and van der Waals attraction. The membrane remains completely free of particles below a critical filtration velocity due to the electrostatic repulsion between the charged particles and the charged membrane. This critical flux increases with increasing surface potential and decreasing ionic strength due to the increase in electrostatic repulsion. The critical flux also increases with increasing wall shear rate due to the reduction in residence time over the pore. Brownian motion provides a random character to the particle trajectories, allowing particles to enter the pores even at operation below the critical flux. Particle transmission increases with increasing filtrate flux and ionic strength, and decreases with increasing particle size, wall shear rate and electrostatic potential.
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U2 - 10.1016/j.memsci.2006.04.037
DO - 10.1016/j.memsci.2006.04.037
M3 - Article
AN - SCOPUS:33746665937
SN - 0376-7388
VL - 281
SP - 666
EP - 675
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1-2
ER -