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Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow.
J Chem Phys 2011; 135(13):134116JC

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.

Authors+Show Affiliations

Theoretical Soft Matter and Biophysics, Institute of Complex Systems, Forschungszentrum Jülich, D-52425 Jülich, Germany.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21992291

Citation

Ji, Shichen, et al. "Mesoscale Hydrodynamic Modeling of a Colloid in Shear-thinning Viscoelastic Fluids Under Shear Flow." The Journal of Chemical Physics, vol. 135, no. 13, 2011, p. 134116.
Ji S, Jiang R, Winkler RG, et al. Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow. J Chem Phys. 2011;135(13):134116.
Ji, S., Jiang, R., Winkler, R. G., & Gompper, G. (2011). Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow. The Journal of Chemical Physics, 135(13), p. 134116. doi:10.1063/1.3646307.
Ji S, et al. Mesoscale Hydrodynamic Modeling of a Colloid in Shear-thinning Viscoelastic Fluids Under Shear Flow. J Chem Phys. 2011 Oct 7;135(13):134116. PubMed PMID: 21992291.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mesoscale hydrodynamic modeling of a colloid in shear-thinning viscoelastic fluids under shear flow. AU - Ji,Shichen, AU - Jiang,Run, AU - Winkler,Roland G, AU - Gompper,Gerhard, PY - 2011/10/14/entrez PY - 2011/10/14/pubmed PY - 2011/10/14/medline SP - 134116 EP - 134116 JF - The Journal of chemical physics JO - J Chem Phys VL - 135 IS - 13 N2 - 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. SN - 1089-7690 UR - https://www.unboundmedicine.com/medline/citation/21992291/Mesoscale_hydrodynamic_modeling_of_a_colloid_in_shear_thinning_viscoelastic_fluids_under_shear_flow_ L2 - https://dx.doi.org/10.1063/1.3646307 DB - PRIME DP - Unbound Medicine ER -