Time-dependent batch settling of flocculated suspensions

Numerical methods for the simulation of the settling of flocculated suspensions

For one space dimension, the phenomenological theory of sedimentation of flocculated suspensions yields a model that consists of an initial-boundary value problem for a second order partial differential equation of mixed hyperbolic–parabolic type. Due to the mixed hyperbolic-parabolic nature of the model, its solutions may be discontinuous and difficulties arise if one tries to construct these ...

Non-Newtonian behaviour of flocculated suspensions

Flocculated suspensions from microstructure to macroscopic behavior

Emanuela Del Gado ETH Zürich Institut für Baustoffe (IfB), Schafmattstrasse 6 CH-8093 Zürich/Switzerland. [email protected] Gelation of Brownian and non-Brownian suspensions Modeling and numerical simulations gain significant insight into local processes and physical mechanisms underlying the interplay of gelation and flocculation in colloidal suspensions. We study local rearrangements, ...

Subtle order in settling suspensions *

A dilute suspension of uniform, non-Brownian spheres settles slowly in a viscous solvent. The initially well-mixed system showing Poisson or random occupancy statistics evolves to a system having reduced number fluctuations, but otherwise appearing random. The reduced number fluctuations are consistent with recent measurements of velocity fluctuations in settling suspensions. These experimental...

Equilibrium-state Density Profiles of Centrifuged Cakes of Flocculated Suspensions

Many advanced ceramics are formed by colloidal consolidation using techniques such as sedimentation, centrifugation, or pressure filtration. In all these, the minimization of density variations of various colloidally-consolidated cakes has not been examined systematically until recently. Schilling et al.' used y-ray densitometry to study the density variations in a sedimented cake and showed th...