Journal Article

PreJuSER-16775

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow

Ji, S.FZJ* ; Jiang, R.FZJ* ; Winkler, R. G.FZJ* ; Gompper, G.FZJ*

2011
American Institute of Physics Melville, NY

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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

Note: We thank Jan Vermant (Leuven), Ingo O. Gotze, and Chien-Cheng Huang (Julich) for stimulating discussions. Financial support by the EU FP7 Collaborative Research Project "Nanodirect" (NMP4-SL-2008-213948) is gratefully acknowledged.

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Contributing Institute(s):

1. Theorie der weichen Materie und Biophysik (ICS-2)
2. Theorie der Weichen Materie und Biophysik (IAS-2)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)

Appears in the scientific report 2011

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