Investigation of shear-banding structure in wormlike micellar solution by point-wise flow-induced birefringence measurements

Lee, J. Y.; Fuller, Gerald G.; Hudson, N.E.; Yuan, Xue‐Feng

doi:10.1122/1.1849179

Cited by 50 publications

(49 citation statements)

References 40 publications

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“…Note that this high-stress turbidity-prone region is not at the wall, but is located close to the inner surface and expands into the gap as the shear rate increases. This is also consistent with birefringence experiments [20,22].…”

Section: Dirichlet Stress Boundary Condition Computationssupporting

confidence: 81%

“…We compare the predictions with those available from experiments on micellar solutions [17,20,21,32]. The geometry we study consists of two concentric cylinders with an inner cylinder of radius R 1 , an outer cylinder of radius R 2 and a gap width of H = R 2 − R 1 .…”

Section: Introductionmentioning

confidence: 97%

“…Second and of more interest to the present study, the flow curve of steady shear stress versus shear rate presents a distinct plateau [3,4]. Flow visualization of micellar solutions in this plateau region shows the formation of shear-bands [20,32,21,22] [17,16]. A number of models have been proposed to explain these phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…For perturbations with controlled shear-rate, we can solve for C in (20) by applying the zero velocity perturbation at R 2 .…”

Section: Computations With Neumann Conformation Boundary Conditionsmentioning

confidence: 99%

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Slippage and migration in Taylor–Couette flow of a model for dilute wormlike micellar solutions

Rossi

McKinley

Cook

2006

Journal of Non-Newtonian Fluid Mechanics

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We explore the rheological predictions of a constitutive model developed for dilute or semi-dilute wormlike micellar solutions in an axisymmetric Taylor-Couette flow. This study is a natural continuation of earlier work on rectilinear shear flows. The model, based on a bead-spring microstructure with nonaffine motion, reproduces the pronounced plateau in the stress strain-rate flow curve that is observed in laboratory measurements of steady shearing flows. We also carry out a linear stability analysis of the computed steady state solutions. The results show shear-banding in the form of sharp changes in velocity gradients, spatial variations in number density, and in alignment or stretching of the micelles. The velocity profiles obtained in numerical solutions show good qualitative agreement with those of laboratory experiments.

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Section: Dirichlet Stress Boundary Condition Computationssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

“…For perturbations with controlled shear-rate, we can solve for C in (20) by applying the zero velocity perturbation at R 2 .…”

Section: Computations With Neumann Conformation Boundary Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Slippage and migration in Taylor–Couette flow of a model for dilute wormlike micellar solutions

Rossi

McKinley

Cook

2006

Journal of Non-Newtonian Fluid Mechanics

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“…PAM solutions, in contrast, show positive birefriengence values [121]. FIB has been reported in a mixture of lyotropic liquid crystals in the isotropic phase [122] and in shear banded GWM solutions [94,123]. In dilute aqueous surfactant solutions with strongly binding counterions, shear-thickening occurs above an induction time τ i .…”

Section: Flow-induced Birefringencementioning

confidence: 99%

Novel experimentally observed phenomena in soft matter

Bandyopadhyay

2013

Pramana - J Phys

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Abstract. Soft materials such as colloidal suspensions, polymer solutions and liquid crystals are constituted by mesoscopic entities held together by weak forces. Their mechanical moduli are several orders of magnitude lower than those of atomic solids. The application of small to moderate stresses to these materials results in the disruption of their microstructures. The resulting flow is non-Newtonian and is characterised by features such as shear rate-dependent viscosities and nonzero normal stresses. This article begins with an introduction to some unusual flow properties displayed by soft matter. Experiments that report a spectrum of novel phenomena exhibited by these materials, such as turbulent drag reduction, elastic turbulence, the formation of shear bands and the existence of rheological chaos, flow-induced birefringence and the unusual rheology of soft glassy materials, are reviewed. The focus then shifts to observations of the liquid-like response of granular media that have been subjected to external forces. The article concludes with examples of the patterns that emerge when certain soft materials are vibrated, or when they are displaced with Newtonian fluids of lower viscosities.

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Rheological Measurements

2013

Encyclopedia of Polymer Science and Technology

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Rheology is the science to study the flow and deformation of matter. It becomes an important field in material science and engineering, food, biotechnology, and so on. The objects in rheological study are not the ideal solid and ideal fluid, which can be described by the Hookean elastic model and the Newtonian viscous model, respectively. Instead, the rheological study often focuses on materials that can exhibit viscous, elastic, and plastic behavior under different flow conditions. They are often termed as complex fluids or soft matter, which include polymers, gels, suspensions, emulsions, biofluids, foods, inks (1). In contrast to hydrodynamics, which often accounts for the complex flow behavior of simple fluids, simple geometry is utilized in rheological measurements to understand the rather complicated relationship between the mechanical input and output of complex fluids. The real flow fields encountered in many applications (such as polymer extrusion, injection molding, blow molding, fiber spinning, inkjet printing, coating) are rather complicated (2). It becomes a problem whether the rheological measurements that performed under simple flow fields are useful in understanding the complicated flow behaviors of complex fluids. Fortunately, it has been proved in many examples that the properties determined from simple rheological measurements are sufficient to quantify the material parameters in various constitutive equations, which have been used widely and successfully to simulate the flow behaviors in polymer processing (3-11). The most frequently used simple flow fields are simple shear flow and simple extensional flow.The simplest geometry that defines the simple shear is two infinite parallel plates separated by a distance h. The liquid is set between two plates with one plate moving parallel to the other (Fig. 1). In reality, when the length L and the width B are much larger than the gap h, the flow in the center regime resembles the flow between two infinite plates. It means that the edge effects are ignored in most experimental shear geometries. In rheological measurements, the flow between two plates should be laminar. Moreover, it is usually assumed that the velocity across the gap satisfies a linear profile. As shown in Fig. 1, if the bottom plate is fixed and the upper plate moves horizontally with the velocity V, the fluid velocity varies linearly from 0 at the bottom plate to V at the upper plate if the no-slip boundary condition is satisfied. The linear velocity profile generates a constant velocity gradient, which is known as the shear rate. Then, the flow field between two parallel plates is homogeneous in the shear rate. The homogeneous assumption is nontrivial in the rheological tests since the actual velocity

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Investigation of shear-banding structure in wormlike micellar solution by point-wise flow-induced birefringence measurements

Cited by 50 publications

References 40 publications

Slippage and migration in Taylor–Couette flow of a model for dilute wormlike micellar solutions

Slippage and migration in Taylor–Couette flow of a model for dilute wormlike micellar solutions

Novel experimentally observed phenomena in soft matter

Rheological Measurements

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