%0 Journal Article
%A Ji, S.
%A Jiang, R.
%A Winkler, R.G.
%A Gompper, G.
%T Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow
%J The journal of chemical physics
%V 135
%@ 0021-9606
%C Melville, NY
%I American Institute of Physics
%M PreJuSER-16775
%P 134116
%D 2011
%Z 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.
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:21992291
%U <Go to ISI:>//WOS:000295625400020
%R 10.1063/1.3646307
%U https://juser.fz-juelich.de/record/16775