Gast ::
| Hauptseite > Publikationsdatenbank > Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow |
| Hauptseite > Publikationsdatenbank > Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow |
| Journal Article | PreJuSER-16775 |
; ; ;
2011
American Institute of Physics
Melville, NY
This record in other databases: 
Please use a persistent id in citations: http://hdl.handle.net/2128/7328 doi:10.1063/1.3646307
Abstract: In order to study the dynamics of colloidal suspensions with viscoelastic solvents, a simple mesoscopic model of the solvent is required. We propose to extend the multiparticle collision dynamics (MPC) technique--a particle-based simulation method, which has been successfully applied to study the hydrodynamic behavior of many complex fluids with Newtonian solvent--to shear-thinning viscoelastic solvents. Here, the normal MPC particles are replaced by dumbbells with finite-extensible nonlinear elastic (FENE) springs. We have studied the properties of FENE-dumbbell fluids under simple shear flow with shear rate ̇γ. The stress tensor is calculated, and the viscosity η and the first normal-stress coefficient Ψ(1) are obtained. Shear-thinning behavior is found for reduced shear rates Γ= ̇γτ>1, where τ is a characteristic dumbbell relaxation time. Here, both η and Ψ(1) display power-law behavior in the shear-thinning regime. Thus, the FENE-dumbbell fluid with MPC collisions provides a good description of viscoelastic fluids. As a first application, we study the flow behavior of a colloid in a shear-thinning viscoelastic fluid in two dimensions. A slowing down of the colloid rotation in a viscoelastic fluid compared to a Newtonian fluid is obtained, in agreement with recent numerical calculations and experimental results.
Keyword(s): J
; 
|
The record appears in these collections: |
PDF
Fulltext by OpenAccess repository