Numerical simulation of particle segregation in a bidisperse suspension

Raphael Pesche (1) , Georges Bossis (2) , Alain Meunier (2)

1 Fakultät für Physik
2 LPMC - Laboratoire de physique de la matière condensée

We have performed numerical simulations of a monolayer of a bidisperse suspension of colloidal particles in a cylindrical Couette flow taking into account hydrodynamic interactions (HI). We compare our simulation results with a simple phenomenological model and obtain good agreement for the monodisperse case. For a bidisperse suspension, we also obtain a good agreement if the ratio of the radii of the two kind of particles is smaller than 0.5. In a second part, we simulate a two-dimensional bidisperse suspension submitted to a simple shear flow and observe, when HI are disregarded, a local segregation with the formation of stripes along the velocity lines

Mots clés: shear-induced migration; bidisperse suspension; cylindrical Couette flow; simple shear flow; hydrodynamic interactions

Domaines: Autre [cond-mat.other]

Raphael Pesche, Georges Bossis, Alain Meunier. Numerical simulation of particle segregation in a bidisperse suspension. 1998. ⟨hal-00694958⟩