Publisher's Note: Negative pressure in shear thickening band of a dilatant fluid [Phys. Rev. E 
<b>94</b>
, 062614 (2016)]

Nagahiro, Shin Ichiro; Nakanishi, Hiizu

doi:10.1103/physreve.97.039901

Cited by 3 publications

(5 citation statements)

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“…Vorticity flow and dilatancy: The observation that the propagating stress fronts are associated with concentration fluctuations and flow in the vorticity direction is consistent with prior results showing that shear thickening is associated with fluctuations and localized dilatantcy [8,16,17,21,22,[26][27][28][29][30]. Fall et al [21] concluded that the excess suspension in Couette or an over-filled parallel plate rheometer geometries affected bulk rheology by providing a reservoir for particles forced out of the shearing region by dilatant pressure.…”

Section: Discussionsupporting

confidence: 75%

“…Fall et al [21] concluded that the excess suspension in Couette or an over-filled parallel plate rheometer geometries affected bulk rheology by providing a reservoir for particles forced out of the shearing region by dilatant pressure. Experiments in a Couette geometry and associated continuum modeling have shown that dilatant fronts that propagate in the flow direction can occur in shear thickening [27,30]. Hermes et al [22] observed that rapid decreases in shear rate were accompanied by local deformations of the airsample interface at the edge of the rheometer tool, and that the deformations sometimes appear static and sometimes move opposite to the direction of the flow.…”

Section: Discussionmentioning

confidence: 99%

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Structure of propagating high stress fronts in a shear thickening suspension

Rathee¹,

Miller²,

Blair³

et al. 2022

Preprint

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We report direct measurements of spatially resolved stress at the boundary of a shear thickening cornstarch suspension revealing persistent regions of high local stress propagating in the flow direction at the speed of the top boundary. The persistence of these propagating fronts enables precise measurements of their structure, including the profile of boundary stress measured by Boundary Stress Microscopy (BSM) and the non-affine velocity of particles at the bottom boundary of the suspension measured by particle image velocimetry (PIV). In addition, we directly measure the relative flow between the particle phase and the suspending fluid (fluid migration) and find the migration is highly localized to the fronts and changes direction across the front, indicating that the fronts are composed of a localized region of high dilatant pressure and low particle concentration. The magnitude of the flow indicates that the pore pressure difference driving the fluid migration is comparable to the critical shear stress for the onset of shear thickening. The propagating fronts fully account for the increase in viscosity with applied stress reported by the rheometer and are consistent with the existence of a stable jammed region in contact with one boundary of the system that generates a propagating network of percolated frictional contacts spanning the gap between the rheometer plates and producing strong localized dilatant pressure.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Structure of propagating high stress fronts in a shear thickening suspension

Rathee¹,

Miller²,

Blair³

et al. 2022

Preprint

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show abstract

“…The complex rheological properties of a dense suspension result in various interesting phenomena, e.g., the stop-and-go (oscillatory) motion of a sinking ball in dense suspension [15,16] and oscillation in a rotating system [17]. These oscillatory behaviors may originate from the hysteresis of viscosity in a dense suspension [18] or the capillary effect [19].…”

Section: Introductionmentioning

confidence: 99%

Bouncing of a projectile impacting a dense potato-starch suspension layer

Egawa

Katsuragi

2019

Physics of Fluids

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When a solid projectile is dropped onto a dense non-Brownian-particle suspension, the action of an extremely large resistance force on the projectile results in its drastic deceleration, followed by a rebound. In this study, we perform a set of simple experiments of dropping a solid-projectile impact onto a dense potato-starch suspension. From the kinematic data of the projectile motion, the restitution coefficient and timescale of the rebound are measured. By assuming linear viscoelasticity, the effective transient elasticity and viscosity can be estimated. We additionally estimate the Stokes viscosity on a longer timescale by measuring the slow sinking time of the projectile. The estimated elastic modulus and viscosity are consistent with separately measured previous results. In addition, the effect of mechanical vibration on the viscoelasticity is examined. As a result, we find that the viscoelasticity of the impacted dense suspension is not significantly affected by the mechanical vibration.

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“…The onset of frictional interactions will likely disrupt layering [19], a scenario confirmed by recent computer simulations [20]. A variety of evidence suggests that strong shear thickening is accompanied by complex spatiotemporal dynamics, including fluctuations in flow speed, local stress, and particle concentration [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. These results highlight the need for methods that can probe the dynamics of dense colloidal suspension with high spatial and temporal resolution.…”

Section: Introductionmentioning

confidence: 65%

“…These observations contribute to a growing body of evidence indicating that the shear thickening transitions typically involved complex spatiotemporal dynamics with structures propagating in the flow direction, including dilatant fronts [23,25], local deformations of the air-sample interface at the edge of the rheometer tool [26,31], local normal stresses in sheared cornstarch [30], concentration fluctuations appearing as periodic waves moving in the direction of flow [29], and high shear stress at the suspension boundary [27,32,33,35]. The specifics of the dynamics vary considerably, presumably indicating a sensitivity to the details of the suspension and the measurement geometry.…”

mentioning

confidence: 65%

Order and density fluctuations near the boundary in sheared dense suspensions

2022

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We introduce a novel approach to reveal ordering fluctuations in sheared dense suspensions, using line scanning in a combined rheometer and laser scanning confocal microscope. We validate the technique with a moderately dense suspension, observing modest shear-induced ordering and a nearly linear flow profile. At high concentration (ϕ = 0.55) and applied stress just below shear thickening, we report ordering fluctuations with high temporal resolution, and directly measure a decrease in order with distance from the suspension’s bottom boundary as well as a direct correlation between order and particle concentration. Higher applied stress produces shear thickening with large fluctuations in boundary stress which we find are accompanied by dramatic fluctuations in suspension flow speeds. The peak flow rates are independent of distance from the suspension boundary, indicating that they likely arise from transient jamming that creates solid-like aggregates of particles moving together, but only briefly because the high speed fluctuations are interspersed with regions flowing much more slowly, suggesting that shear thickening suspensions possess complex internal structural dynamics, even in relatively simple geometries.

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Publisher's Note: Negative pressure in shear thickening band of a dilatant fluid [Phys. Rev. E 94 , 062614 (2016)]

Abstract: This corrects the article DOI: 10.1103/PhysRevE.94.062614.

Cited by 3 publications

References 0 publications

Structure of propagating high stress fronts in a shear thickening suspension

Structure of propagating high stress fronts in a shear thickening suspension

Bouncing of a projectile impacting a dense potato-starch suspension layer

Order and density fluctuations near the boundary in sheared dense suspensions

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