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000016775 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000016775 1001_ $$0P:(DE-Juel1)VDB94057$$aJi, S.$$b0$$uFZJ
000016775 245__ $$aMesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow
000016775 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2011
000016775 300__ $$a134116
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000016775 440_0 $$03145$$aJournal of Chemical Physics$$v135$$x0021-9606$$y13
000016775 500__ $$aWe thank Jan Vermant (Leuven), Ingo O. Gotze, and Chien-Cheng Huang (Julich) for stimulating discussions. Financial support by the EU FP7 Collaborative Research Project "Nanodirect" (NMP4-SL-2008-213948) is gratefully acknowledged.
000016775 520__ $$aIn 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.
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000016775 7001_ $$0P:(DE-Juel1)VDB104194$$aJiang, R.$$b1$$uFZJ
000016775 7001_ $$0P:(DE-Juel1)131039$$aWinkler, R.G.$$b2$$uFZJ
000016775 7001_ $$0P:(DE-Juel1)130665$$aGompper, G.$$b3$$uFZJ
000016775 773__ $$0PERI:(DE-600)1473050-9$$a10.1063/1.3646307$$gVol. 135, p. 134116$$p134116$$q135<134116$$tThe @journal of chemical physics$$v135$$x0021-9606$$y2011
000016775 8567_ $$uhttp://dx.doi.org/10.1063/1.3646307
000016775 8564_ $$uhttps://juser.fz-juelich.de/record/16775/files/FZJ-16775.pdf$$yPublished under German "Allianz" Licensing conditions on 2011-10-06. Available in OpenAccess from 2011-10-06$$zPublished final document.
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