Classification of Fine Particles Using the Hydrodynamic Forces in the Boundary Layer of a Membrane

Abstract

The wet classification of particles < 10 μm is a complex process that has been researched for many years. In this study, the usage of a modified cross‐flow filtration process as a classification process was investigated. With this process, particles in a fine micrometer range can be separated from suspensions. The upper particle size is dependent on hydrodynamic forces. The experimental results were compared with different hydrodynamic force models to predict upper size. The influence of the permeate flux and the particle concentration in the feed on the upper particle size is studied.

Diafiltration of Highly Concentrated Suspensions with Fine Particles by Dynamic Disk Filtration

“…This equilibrium is determined by the wall shear stress τ w and the transmembrane pressure 31. The size‐dependent particle deposition and its description using the equilibrium of hydrodynamic forces were experimentally investigated in cross‐flow filtration in previous works 32, 33. In contrast to the classical cross‐flow filtration, the wall shear stress does not exclusively depend on the cross‐flow velocity of the suspension.…”