Rheophysics of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer

Wiederseiner, Sébastien; Ancey, Christophe; Rentschler, Martin; Andreini, Nicolas

doi:10.1063/1.3179828

Cited by 2 publications

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“…PIV is a now widespread non-invasive technique that allows for flow profile measurements (see [Adrian (2005)] for a review). However, even if it has been already used in the field of concentrated suspensions [Lenoble et al (2005)], [Wiederseiner et al (2009)], PIV is still a challenging technique in such heterogeneous media. The experimental facility and methods are described in detail elsewhere [Blanc et al (2011)].…”

Section: Methodsmentioning

confidence: 99%

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Local transient rheological behavior of concentrated suspensions

Blanc‬

Peters

Lemaire

2011

Journal of Rheology

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This paper reports experiments on the shear transient response of concentrated non-Brownian suspensions. The shear viscosity of the suspensions is measured using a wide-gap Couette rheometer equipped with a Particle Image Velocimetry (PIV) device that allows measuring the velocity field. The suspensions made of PMMA particles (31$\mu$m in diameter) suspended in a Newtonian index- and density-matched liquid are transparent enough to allow an accurate measurement of the local velocity for particle concentrations as high as 50%. In the wide-gap Couette cell, the shear induced particle migration is evidenced by the measurement of the time evolution of the flow profile. A peculiar radial zone in the gap is identified where the viscosity remains constant. At this special location, the local particle volume fraction is taken to be the mean particle concentration. The local shear transient response of the suspensions when the shear flow is reversed is measured at this point where the particle volume fraction is well defined. The local rheological measurements presented here confirm the macroscopic measurements of Gadala-Maria and Acrivos (1980). After shear reversal, the viscosity undergoes a step-like reduction, decreases slower and passes through a minimum before increasing again to reach a plateau. Upon varying the particle concentration, we have been able to show that the minimum and the plateau viscosities do not obey the same scaling law with respect to the particle volume fraction. These experimental results are consistent with the scaling predicted by Mills and Snabre (2009) and with the results of numerical simulation performed on random suspensions [Sierou and Brady (2001)]. The minimum seems to be associated with the viscosity of an isotropic suspension, or at least of a suspension whose particles do not interact through non-hydrodynamic forces, while the plateau value would correspond to the viscosity of a suspension structured by the shear where the non-hydrodynamic forces play a crucial role

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Local transient rheological behavior of concentrated suspensions

Blanc‬

Peters

Lemaire

2011

Journal of Rheology

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Note: Eliminating stripe artifacts in light-sheet fluorescence imaging

Salili

Harrington

Durian

2018

Review of Scientific Instruments

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We report two techniques to mitigate stripe artifacts in light-sheet fluorescence imaging. The first uses an image processing algorithm called the multidirectional stripe remover method to filter stripes from an existing image. The second uses an elliptical holographic diffuser with strong scattering anisotropy to prevent stripe formation during image acquisition. These techniques facilitate accurate interpretation of image data, especially in denser samples. They are also facile and cost-effective.

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Rheophysics of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer

Cited by 2 publications

References 0 publications

Local transient rheological behavior of concentrated suspensions

Local transient rheological behavior of concentrated suspensions

Note: Eliminating stripe artifacts in light-sheet fluorescence imaging

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