TY  - JOUR
AU  - Ji, S.
AU  - Jiang, R.
AU  - Winkler, R.G.
AU  - Gompper, G.
TI  - Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow
JO  - The journal of chemical physics
VL  - 135
SN  - 0021-9606
CY  - Melville, NY
PB  - American Institute of Physics
M1  - PreJuSER-16775
SP  - 134116
PY  - 2011
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:21992291
UR  - <Go to ISI:>//WOS:000295625400020
DO  - DOI:10.1063/1.3646307
UR  - https://juser.fz-juelich.de/record/16775
ER  -