A mesoscopic rheological model of moderately concentrated colloids

Miroslav Grmela (1) , Amine Ammar (2) , Francisco Chinesta (3) , Guillaume Maitrejean (4)

1 EPM - École Polytechnique de Montréal
2 LAMPA - Laboratoire Angevin de Mécanique, Procédés et InnovAtion
3 GeM - Institut de Recherche en Génie Civil et Mécanique
4 LR - Laboratoire de rhéologie

We extend the Maffettone–Minale model by including non-elliptical shapes of dispersed particles, a new family of internal forces controlling particle deformations, and particle–particle interactions. The last extension is made by transposing the way the chain-chain interactions are mathematically expressed in the reptation theory to suspensions. The particle–particle interactions are regarded as a confinement to cages formed by surrounding particles and by introducing a new dissipative motion (an analog of the reptation motion) inside the cages. Nonlinear responses to imposed shear and elongational flows are found to be in qualitative agreement with available experimental data.

Mots clés: Soft colloids; rheology of concentrated suspension; Generic

Domaines: Mécanique des fluides [physics.class-ph]

Miroslav Grmela, Amine Ammar, Francisco Chinesta, Guillaume Maitrejean. A mesoscopic rheological model of moderately concentrated colloids. Journal of Non-Newtonian Fluid Mechanics, 2014, 212, pp.1-12. ⟨10.1016/j.jnnfm.2014.07.005⟩. ⟨hal-02465887⟩