Shear thickening in low-concentration solutions of wormlike micelles. I. Direct visualization of transient behavior and phase transitions

Hu, Yuntao; Boltenhagen, Philippe; Pine, David

doi:10.1122/1.550926

Cited by 199 publications

(252 citation statements)

References 17 publications

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“…These states are separated by some dynamical transitions (i.e., the above-mentioned instabilities) and are most often described as a jump between two branches of steady states. Rheological experiments show that these transitions actually correspond to a discontinuity in the shear rate variable [6,[12][13][14] or in the stress variable [12,15]. However, as emphasized in previous papers [12], the fact that the complex fluid is sheared, and thus is maintained out of equilibrium, should lead to richer behavior than a simple jump between two stationary states.…”

Section: Oscillating Viscosity In a Lyotropic Lamellar Phase Under Shmentioning

confidence: 87%

“…The observation of oscillations in complex systems is not completely new; in recent works such behavior has been reported in dilute wormlike micelles solution [15] and in concentrated lamellar phase [20] under shear flow. The novelty of the present paper is that it brings the experimental demonstration that these oscillations of the macroscopic viscosity are clearly associated with two distinct structural steady states.…”

Section: Oscillating Viscosity In a Lyotropic Lamellar Phase Under Shmentioning

confidence: 99%

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Oscillating Viscosity in a Lyotropic Lamellar Phase under Shear Flow

et al. 2001

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Section: Oscillating Viscosity In a Lyotropic Lamellar Phase Under Shmentioning

confidence: 87%

Section: Oscillating Viscosity In a Lyotropic Lamellar Phase Under Shmentioning

confidence: 99%

Oscillating Viscosity in a Lyotropic Lamellar Phase under Shear Flow

et al. 2001

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“…Several observations of new phenomena have been reported, including shear thickening [14,15], a stress plateau in steady shear rheology [16,17], and flow instabilities such as shear-banding [18]. Bandyopadhyay et al have observed chaotic fluctuations in the stress when a wormlike micellar solution is subjected to a step shear rate above a certain critical value (in the plateau region of stress-shear rate curve) [19].…”

mentioning

confidence: 99%

“…This could be an effect of the inertia of the sphere. It could also be due to the time needed to form shear-induced structures [14,24]. If the sphere is heavy its average velocity is sufficiently high and it moves into fresh fluid while the structures are still forming.…”

mentioning

confidence: 99%

Oscillations of a solid sphere falling through a wormlike micellar fluid

2003

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We present an experimental study of the motion of a solid sphere falling through a wormlike micellar fluid. While smaller or lighter spheres quickly reach a terminal velocity, larger or heavier spheres are found to oscillate in the direction of their falling motion. The onset of this instability correlates with a critical value of the velocity gradient scale Γc ∼ 1 s −1 . We relate this condition to the known complex rheology of wormlike micellar fluids, and suggest that the unsteady motion of the sphere is caused by the formation and breaking of flow-induced structures.PACS numbers: 47.50.+d, 83.50.Jf, 83.60.Wc A sphere falling through a viscous Newtonian fluid is a classic problem in fluid dynamics, first solved mathematically by Stokes in 1851 [1]. Stokes provided a formula for the drag force F experienced by a sphere of radius R when moving at constant speed V 0 though a fluid with viscosity µ: F = 6πµRV 0 . The simplicity of the falling sphere experiment has meant that the viscosity can be measured directly from the terminal velocity V 0 , using a modified Stokes drag which takes into account wall effects [2]. The falling sphere experiment has also been used to study the viscoelastic properties of many polymeric (nonNewtonian) fluids [3,4,5]. In general, a falling sphere in a non-Newtonian fluid always approaches a terminal velocity, though sometimes with an oscillating transient [6,7,8]. In this paper we present evidence that a sphere falling in a wormlike micellar solution does not seem to approach a steady terminal velocity; instead it undergoes continual oscillations as it falls, as shown in Fig. 1.A wormlike micellar fluid is an aqueous solution in which amphiphilic (surfactant) molecules self-assemble in the presence of NaSal into long tubelike structures, or worms [9]; these micelles can sometimes be as long as 1µm [10]. Most wormlike micellar solutions are viscoelastic, and at low shear rates their rheological behavior is very similar to that of polymer solutions. However, unlike polymers, which are held together by strong covalent bonds, the micelles are held together by relatively weak entropic and screened electrostatic forces, and hence can break under shear. In fact, under equilibrium conditions these micelles are constantly breaking and reforming, providing a new mechanism for stress relaxation [11].The nonlinear rheology of these micellar fluids can be very different from standard polymer solutions [11,12,13]. Several observations of new phenomena have been reported, including shear thickening [14,15], a stress plateau in steady shear rheology [16,17], and flow instabilities such as shear-banding [18]. Bandyopadhyay et al. have observed chaotic fluctuations in the stress when a wormlike micellar solution is subjected to a step shear rate above a certain critical value (in the plateau region of stress-shear rate curve) [19]. A shear-induced transition from an isotropic to a nematic micellar ordering has also been observed [20]. There is increasing experimental evidence relating the onset of...

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“…Furthermore, a slight degree of shear thickening occurs at lower salt concentrations and/or dilute solutions, leading to a fractional viscosity increase of 0.2 mPa s from 1 to 100 s -1 . This can indicate hydrodynamic instabilities above a critical shear rate in the solution, most likely attributed to the formation of nonequilibrium, shear-induced, micellar phase transitions (Barentin and Liu 2001;Berret 2006;Hu et al 1998). In addition, shear thickening under steady shear can occur when the surfactant concentration is close to the critical micelle concentration (Koehler et al 2000).…”

Section: Effect Of Shear Ratementioning

confidence: 99%

A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

2018

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The basis of this study is to identify the versatility of N,N,N 0 -trimethyl-N 0 -tallow-1,3-diaminopropane (DTTM) surfactant in high saline environments. The surfactant was examined with sodium chloride, NaCl, to understand how triggers such as salt, pH, temperature, and surfactant concentration influences the viscoelastic response of the surfactant solution. The DTTM surfactant and salt (NaCl) concentrations used in steady-state shear viscosity analysis range from 0.2 wt% to 2 wt% and 5 wt% to 25 wt%, respectively. Along with DTTM results, three similar chemical structures are investigated to understand how viscosity changes with alterations in tail and head group composition. It was found that DTTM surfactant has the capability of transitioning from a foam-bearing to viscoelastic state at low surfactant concentrations under moderate to high saline conditions. A longer tail length promotes viscoelasticity and shear-thinning behavior. Terminals consisting of hydroxides or ethoxylates have a lower viscosity than that of methyl terminals. A head group consisting of two nitrogen atoms has a higher viscosity than those containing one nitrogen atom. The rheological characterization of DTTM presented in this paper is part of a larger study in determining the capability of this surfactant to foam CO 2 for improving mobility control in CO 2 enhanced oil recovery in high saline oil formations.

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Shear thickening in low-concentration solutions of wormlike micelles. I. Direct visualization of transient behavior and phase transitions

Cited by 199 publications

References 17 publications

Oscillating Viscosity in a Lyotropic Lamellar Phase under Shear Flow

Oscillating Viscosity in a Lyotropic Lamellar Phase under Shear Flow

Oscillations of a solid sphere falling through a wormlike micellar fluid

A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

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