Simultaneous Concentration and Velocity Maps in Particle Suspensions under Shear from Rheo-Ultrasonic Imaging

Saint-Michel, Brice; Bodiguel, Hugues; Meeker, Steven; Manneville, Sébastien

doi:10.1103/physrevapplied.8.014023

Cited by 16 publications

(21 citation statements)

References 73 publications

(100 reference statements)

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“…To investigate the propagation of this low-frequency shear guided mode we used an ultrafast ultrasound scanner (Aixplorer®) that was originally developed in our laboratory to track tissue motion induced by low-speed shear waves in the context of medical imaging 28 . This kind of scanner can acquire images up to 200 times faster than conventional ultrasound systems and it was also applied for rheology measurements in complex fluids 29 . Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The axial particle velocity field v z (x, z, t) (= v ac ) associated to shear wave propagation at a given instant t after the source excitation can be obtained (at least for the first ~10 mm of depth) by correlating in time the speckle pattern observed from one image S t (x, z) to the next S t+Dt (x, z) (i.e., by speckle interferometry) 29 , with Dt ~ 1/ f RF and f RF = 16 kHz the frame rate.…”

Section: Ultrafast Ultrasound Imagingmentioning

confidence: 99%

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Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

et al. 2019

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We present an experimental investigation of shear elastic wave propagation along the surface of a dense granular suspension. Using an ultrafast ultrasound scanner, we monitor the softening of the shear wave velocity inside the optically opaque medium as the driving amplitude increases. For such nonlinear behavior two regimes are found: in the first regime, we observe a significant shear modulus weakening, but without visible grain rearrangements.In the second regime, there is a clear grain rearrangement accompanied by a modulus decrease up to 88%. A friction model is proposed to describe the interplay between nonlinear elasticity and plasticity, which highlights the crucial effect of contact slipping before contact breaking. Investigation of these nonlinear shear waves may bridge the gap between two disjoint approaches for describing the dynamics near unjamming: linear elastic soft modes and nonlinear collisional shock.

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Section: Methodsmentioning

confidence: 99%

Section: Ultrafast Ultrasound Imagingmentioning

confidence: 99%

Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

et al. 2019

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“…The theoretical models often have limitations, especially in terms of maximum volume fractions that can be accurately accommodated (Hunter et al 2012a). This has led to the development of more generalized approaches over the past decade and can be broadly categorized into: semi-empirical (Hunter et al 2012b;Rice et al 2014;Bux et al 2015;Rice et al 2015) and empirical (Furlan et al 2012;Saint-Michel et al 2017).…”

Section: Introduction and Scopementioning

confidence: 99%

Ultrasonic particle volume fraction profiling: an evaluation of empirical approaches

2021

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We discuss empirical techniques to extract quantitative particle volume fraction profiles in particle-laden flows using an ultrasound transducer. A key step involves probing several uniform suspensions with varying bulk volume fractions from which two key volume fraction dependent calibration parameters are identified: the peak backscatter amplitude (acoustic energy backscattered by the initial layer of the suspension) and the amplitude attenuation rate (rate at which the acoustic energy decays with depth owing to scattering losses). These properties can then be used to reconstruct spatially varying particle volume fraction profiles. Such an empirical approach allows circumventing detailed theoretical models which characterize the interaction between ultrasound and suspensions, which are not universally applicable. We assess the reconstruction techniques via synthetic volume fraction profiles and a known particle-laden suspension immobilized in a gel. While qualitative trends can be easily picked up, the following factors compromise the quantitative accuracy: (1) initial reconstruction errors made in the near-wall regions can propagate and grow along the reconstruction direction, (2) multiple scattering can create artefacts which may affect the reconstruction, and (3) the accuracy of the reconstruction is very sensitive to the goodness of the calibration. Despite these issues, application of the technique to particle-laden pipe flows shows the presence of a core with reduced particle volume fractions in laminar flows, whose prominence reduces as the flow becomes turbulent. This observation is associated with inertia-induced radial migration of particles away from the pipe axis and is observed in flows with bulk volume fractions as high as 0.08. Even transitional flows with low levels of intermittency are not devoid of this depleted core. In conclusion, ultrasonic particle volume fraction profiling can play a key complementary role to ultrasound-based velocimetry in studying the internal features of particle-laden flows. Graphic abstract

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“…In some other papers it is proposed to model the Doppler effect in Multiple Scattering regime using a Monte-Carlo simulation in acoustics [14] or in optics [15], and it is shown multiple scattering causes distorsion of the measured flow. Another paper proposes a technique using a beam-forming method [16], assuming that single scattering is predominant, that is to say, no multiple scattering occurs. In multiple scattering regime, another technique has been studied, using a coherent wave phase conjugation process [17].…”

Section: Introductionmentioning

confidence: 99%

Bubbly flow velocity measurement in multiple scattering regime

et al. 2019

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We propose a technique to measure the velocity of a bubble cloud based on the coda correlation. The method is founded on successive recordings of multiple scattered waves from a bubble cloud. Our model predicts the dependence between the correlation coefficient of these coda waves and the velocity of the bubble cloud under diffusion approximation. The Acoustic experiments are validated by simultaneous optical measurements in a water tank, with a good agreement between the acoustical and the optical methods (relative difference smaller than 7%). This technique can be transposed to any particle flow velocity problems involving multiple scattering effects in acoustics.

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Simultaneous Concentration and Velocity Maps in Particle Suspensions under Shear from Rheo-Ultrasonic Imaging

Cited by 16 publications

References 73 publications

Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

Ultrasonic particle volume fraction profiling: an evaluation of empirical approaches

Bubbly flow velocity measurement in multiple scattering regime

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