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**Harvard**

Andric, J., Lindström, S., Sasic, S. och Nilsson, H. (2014) *Rheological properties of dilute suspensions of rigid and flexible fibers*.

** BibTeX **

@article{

Andric2014,

author={Andric, Jelena and Lindström, Stefan B. and Sasic, Srdjan and Nilsson, Håkan},

title={Rheological properties of dilute suspensions of rigid and flexible fibers},

journal={Journal of Non-Newtonian Fluid Mechanics},

issn={0377-0257},

volume={212},

pages={36-46},

abstract={Particle-level simulations are used to study the rheology of monodispersed suspensions of rigid and flexible fibers in a creeping, simple shear flow of a Newtonian fluid. We also investigate the influence of different equilibrium shapes (straight and curved) of the fibers on the behavior of the suspension. A parametric study of the impacts of fiber flexural rigidity and morphology on rheology quantifies the effects of these realistic fiber features on the experimentally accessible rheological properties. A fiber is modeled as a chain of rigid cylindrical segments, interacting through a two-way coupling with the fluid described by the incompressible three-dimensional Navier--Stokes equations. The initial fiber configuration is in the flow--gradient plane. We show that, when the shear rate is increased, straight flexible fibers undergo a buckling transition, leading to the development of finite first and second normal stress differences and a reduction of the viscosity. These effects, triggered by shape fluctuations, are dissimilar to the effects induced by the curvature of stiff, curved fibers, for which the viscosity increases with the curvature of the fiber. An analysis of the orbital drift of fibers initially oriented at an angle to the flow--gradient plane provides an estimate for the time-scale within which the prediction of the rheological behavior is valid. The information obtained in this work can be used in the experimental characterization of fiber morphology and mechanics through rheology.},

year={2014},

keywords={ deviatoric stress; flexible fiber; curved rigid fiber; particle-level simulation},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 201736

A1 Andric, Jelena

A1 Lindström, Stefan B.

A1 Sasic, Srdjan

A1 Nilsson, Håkan

T1 Rheological properties of dilute suspensions of rigid and flexible fibers

YR 2014

JF Journal of Non-Newtonian Fluid Mechanics

SN 0377-0257

VO 212

SP 36

OP 46

AB Particle-level simulations are used to study the rheology of monodispersed suspensions of rigid and flexible fibers in a creeping, simple shear flow of a Newtonian fluid. We also investigate the influence of different equilibrium shapes (straight and curved) of the fibers on the behavior of the suspension. A parametric study of the impacts of fiber flexural rigidity and morphology on rheology quantifies the effects of these realistic fiber features on the experimentally accessible rheological properties. A fiber is modeled as a chain of rigid cylindrical segments, interacting through a two-way coupling with the fluid described by the incompressible three-dimensional Navier--Stokes equations. The initial fiber configuration is in the flow--gradient plane. We show that, when the shear rate is increased, straight flexible fibers undergo a buckling transition, leading to the development of finite first and second normal stress differences and a reduction of the viscosity. These effects, triggered by shape fluctuations, are dissimilar to the effects induced by the curvature of stiff, curved fibers, for which the viscosity increases with the curvature of the fiber. An analysis of the orbital drift of fibers initially oriented at an angle to the flow--gradient plane provides an estimate for the time-scale within which the prediction of the rheological behavior is valid. The information obtained in this work can be used in the experimental characterization of fiber morphology and mechanics through rheology.

LA eng

DO 10.1016/j.jnnfm.2014.08.002

LK http://dx.doi.org/10.1016/j.jnnfm.2014.08.002

OL 30