High-frequency ultrasonic speckle velocimetry in sheared complex fluids

Manneville, Sébastien; Bécu, Lydiane; Colin, Annie

doi:10.1051/epjap:2004165

Cited by 136 publications

(143 citation statements)

References 58 publications

(79 reference statements)

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“…In the shear banding regime, homogeneous flow of wormlike micellar solutions can become unstable and separate into coexisting shear bands with different local viscosities and internal structures [Cappelaere et al (1995[Cappelaere et al ( , 1997; Rehage and Hoffmann (1991)]. Macroscopic rheology coupled with local measurements such as nuclear magnetic resonance [Britton and Callaghan (1997); Holmes et al (2004)], DLS [Salmon et al (2003)], PIV (particle tracking velocimetry) [Hu and Lips (2005)], high frequency ultrasonic velocimetry ; Manneville et al (2004)], rheooptics [Lerouge and Berret (2010)], spatially resolved SANS measurements in the flowgradient plane [Helgeson et al (2009a[Helgeson et al ( , 2009b; Liberatore et al (2006Liberatore et al ( , 2009], and a combination of different techniques have been widely used to explore the complex spatio-temporal dynamics in the heterogeneous structures at the shear plateau regime [Berret et al ( , 1994 Lower shear rates (_ c ¼ 0:001 and 0.005 s À1 ) were chosen in the low shear rate regime prior to shear banding. The maximum shear stress r increased monotonically with imposed strain c and continuous shear deformation.…”

Section: Hydrophobic Hncmentioning

confidence: 99%

Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

Zhao

Haward

Shen

2015

Journal of Rheology

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Determination of characteristic lengths and times for wormlike micelle solutions from rheology using a mesoscopic simulation method Journal of Rheology 59, 903 (2015) AbstractAqueous micellar solutions of cationic surfactant cetyltrimethylammonium bromide (CTAB) and organic hydrotropic salt 3-hydroxy naphthalene-2-carboxylate (SHNC) in the semidilute regime have been characterized by linear and nonlinear rheology, and dynamic light scattering. The strong hydrophobicity and naphthalene structure present in the SHNC induces significant growth of CTAB wormlike micelles and promotes stable micellar network formation. Focusing primarily on 75 mM CTAB/SHNC solution, we correlate the rich rheological behavior with structural transitions of the micellar network under different deformation histories with temperatures in the range of 20 C < T < 40 C. Viscous dissipation dominates at low temperature, while short range interactions among micellar head groups, reorganization of micellar networks play important roles at higher temperatures, leading to complex stress responses under large deformations. The influence of double benzene rings on the response of transient and large amplitude oscillatory shear flows in the system was further elucidated by comparing the rheological behavior of CTAB/SHNC with CTAB/NaSal at the same salt and surfactant concentrations. Our studies distinguished SHNC as a stable hydrotrope in a semidilute cationic surfactant system under thermal variations, with potential applications such as drag reduction and fracturing fluids in oil recovery.

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Section: Hydrophobic Hncmentioning

confidence: 99%

Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

Zhao

Haward

Shen

2015

Journal of Rheology

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“…UVP is a noninvasive velocimetric technique to measure local viscosities at microscopic resolutions inside the gap of rheometric geometry. This technique is based on time domain cross-correlation of highfrequency ultrasonic signals backscattered by tracer particles seeded in the flowing solution [36]. Figure 1a shows the typical linear velocity profile obtained by the UVP method for a Newtonian fluid being sheared in the gap of a Couette geometry.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound velocimetry in a shear-thickening wormlike micellar solution: Evidence for the coexistence of radial and vorticity shear bands

2008

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Abstract. We carried out pointwise local velocity measurements on 40 mM cetylpyridinium chloride-sodium salicylate (CPyCl-NaSal) wormlike micellar solution using high-frequency ultrasound velocimetry in a Couette shear cell. The studied wormlike solution exhibits Newtonian, shear-thinning and shear-thickening rheological behavior in a stress-controlled environment. Previous rheology, flow visualization and small-angle light/neutron scattering experiments in the shear-thickening regime of this system showed the presence of stress-driven alternating transparent and turbid rings or vorticity bands along the axis of the Couette geometry. Through local velocity measurements we observe a homogeneous flow inside the 1 mm gap of the Couette cell in the shear-thinning (stress-plateau) region. Only when the solution is sheared beyond the critical shear stress (shear-thickening regime) in a stress-controlled experiment, we observe inhomogeneous flow characterized by radial or velocity gradient shear bands with a highly sheared band near the rotor and a weakly sheared band near the stator of the Couette geometry. Furthermore, fast measurements performed in the shear-thickening regime to capture the temporal evolution of local velocities indicate coexistence of both radial and vorticity shear bands. However the same measurements carried out in shear rate controlled mode of the rheometer do not show such rheological complexity.

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“…Our technique is based on time-domain crosscorrelation of high-frequency ultrasonic signals backscattered by the moving fluid. Post-processing of acoustic data allows us to record a velocity profile in 0.02-2 s with a spatial resolution of 40 µm [31]. Such a temporal resolution allows us to follow the dynamics of velocity profiles during the viscosity oscillations and to better understand the mechanisms at play during these oscillations.…”

Section: Introductionmentioning

confidence: 99%

A spatio-temporal study of rheo-oscillations in a sheared lamellar phase using ultrasound

2004

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Abstract. We present an experimental study of the flow dynamics of a lamellar phase sheared in the Couette geometry. High-frequency ultrasonic pulses at 36 MHz are used to measure time-resolved velocity profiles. Oscillations of the viscosity occur in the vicinity of a shear-induced transition between a high-viscosity disordered fluid and a low-viscosity ordered fluid. The phase coexistence shows up as shear bands on the velocity profiles. We show that the dynamics of the rheological data result from two different processes: (i) fluctuations of slip velocities at the two walls and (ii) flow dynamics in the bulk of the lamellar phase. The bulk dynamics are shown to be related to the displacement of the interface between the two differently sheared regions in the gap of the Couette cell. Two different dynamical regimes are investigated under applied shear stress: one of small amplitude oscillations of the viscosity (δη/η ≃ 3 %) and one of large oscillations (δη/η ≃ 25 %). A phenomenological model is proposed that may account for the observed spatio-temporal dynamics.PACS. 83.10.Tv Structural and phase changes -43.58.+z Acoustical measurements and instrumentation -47.50.+d Non-Newtonian fluid flows

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High-frequency ultrasonic speckle velocimetry in sheared complex fluids

Cited by 136 publications

References 58 publications

Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

Ultrasound velocimetry in a shear-thickening wormlike micellar solution: Evidence for the coexistence of radial and vorticity shear bands

A spatio-temporal study of rheo-oscillations in a sheared lamellar phase using ultrasound

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