Effect of interparticle forces on shear thickening of oxide suspensions

Franks, George V.; Zhou, Zhongwu; Duin, Nanda J.; Boger, David V.

doi:10.1122/1.551111

Cited by 112 publications

(65 citation statements)

References 43 publications

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“…When the layers' thickness is small as compared with the particle diameter, the energy dissipation in the thin lubrication layers between the particles leads to an increase of the effective viscosity η (in the considered region oḟ γ ) about several times and even more than an order of magnitude. Qualitatively this conclusion is in agreement with the experimental results, presented in [8,[11][12][13]15]. In part, experiment [11] demonstrates strong, i.e., more than an order of magnitude, growth of the suspension viscosity with an increase of the pH of the system.…”

Section: Results Of Calculationssupporting

confidence: 81%

“…Qualitatively this conclusion is in agreement with the experimental results, presented in [8,[11][12][13]15]. In part, experiment [11] demonstrates strong, i.e., more than an order of magnitude, growth of the suspension viscosity with an increase of the pH of the system. This means compression of the Debye layers and, therefore, increase of the complex κa.…”

Section: Results Of Calculationssupporting

confidence: 81%

“…Overviews of works on the rheology of the highly concentrated suspensions can be found in Refs. [7][8][9][10][11][12][13]. A typical sketch of the dependence of viscosity of concentrated suspensions on shear rate is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Shear thickening of dense suspensions due to energy dissipation in lubrication layers between particles

Iskakova

Zubarev²

2013

Phys. Rev. E

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This paper deals with a theoretical study of the shear thickening effects in concentrated suspensions of non-Brownian particles. Our analysis shows that an increase of the shear rate of the suspension flow leads to a decrease of the mean thickness of the gaps between the nearest particles in dense suspensions. In turn, this leads to the growth of energy dissipation in these gaps, which means an increase of the suspension effective viscosity with the shear rate.

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Section: Results Of Calculationssupporting

confidence: 81%

Section: Results Of Calculationssupporting

confidence: 81%

See 1 more Smart Citation

Shear thickening of dense suspensions due to energy dissipation in lubrication layers between particles

Iskakova

Zubarev²

2013

Phys. Rev. E

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“…This provides a simple model of screened electrostatic interactions that can often be found in aqueous systems (28,29), in which case λ is the Debye length. With one force scale and one length scale, this is the most basic parametrization of a generic stabilizing force.…”

Section: Model Descriptionmentioning

confidence: 99%

Discontinuous shear thickening in Brownian suspensions by dynamic simulation

Mari

Seto

Morris

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

163

117

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Dynamic particle-scale numerical simulations are used to show that the shear thickening observed in dense colloidal, or Brownian, suspensions is of a similar nature to that observed in noncolloidal suspensions, i.e., a stress-induced transition from a flow of lubricated near-contacting particles to a flow of a frictionally contacting network of particles. Abrupt (or discontinuous) shear thickening is found to be a geometric rather than hydrodynamic phenomenon; it stems from the strong sensitivity of the jamming volume fraction to the nature of contact forces between suspended particles. The thickening obtained in a colloidal suspension of purely hard frictional spheres is qualitatively similar to experimental observations. However, the agreement cannot be made quantitative with only hydrodynamics, frictional contacts, and Brownian forces. Therefore, the role of a short-range repulsive potential mimicking the stabilization of actual suspensions on the thickening is studied. The effects of Brownian and repulsive forces on the onset stress can be combined in an additive manner. The simulations including Brownian and stabilizing forces show excellent agreement with experimental data for the viscosity η and the second normal stress difference N 2 .soft matter | colloidal suspensions | shear thickening | rheology | jamming T he rheology of dense suspensions is of considerable theoretical and technological importance, yet the shear rheology of even the simplest case of a suspension of hard spheres in a Newtonian suspending fluid is incompletely understood (1). Many of the features observed in these suspensions, including shear thinning (2) or thickening (3, 4) and the magnitudes and even the algebraic signs of normal stress differences (5), are at best understood at a qualitative level, and a general theoretical framework is lacking. Furthermore, there has been a tendency to treat the rheology of Brownian (colloidal) suspensions and nonBrownian suspensions as distinct.Recently, a picture has emerged in which central aspects of the rheology of non-Brownian dense suspensions are interpreted as manifestations of proximity to jamming transitions in the parameter space. These transitions are singularities whose locations in the volume fraction ϕ and shear stress σ-plane depend on the details of the microscopic interactions (shape of the particles, friction, interparticle forces). In turn, the locations of these singularities shape the large ϕ-portion of the rheological landscape, i.e., the effective viscosity and the normal stresses as functions of ϕ and σ. In particular, in the "stress-induced friction" scenario (4, 6-13), shear thickening is a transition from a rheological response dominated by frictionless jamming to one controlled by frictional jamming upon increase of the shear stress. This transition is argued to be due to the creation of frictional contacts between particles at high stresses; the contacts are prevented at low stresses by a short-range stabilizing repulsive force, as would be expected to be present to...

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“…However, high-concentration slurries often exhibit shear thinning even if their particles are well dispersed. 29 Thus, it is difficult to determine dispersion states correctly by using only viscosity curves.…”

Section: Introductionmentioning

confidence: 99%

Particle sedimentation monitoring in high-concentration slurries

2016

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In this study, the sedimentation states of particles in high-concentration slurries were elucidated by monitoring their internal states. We prepared transparent high-concentration silica slurries by adjusting the refractive index of the aqueous glycerol liquid in which the particles were dispersed to match that of the silica particles. In addition, a fluorescent dye was dissolved in the liquid. Then, we directly observed the individual and flocculated particles in the slurries during sedimentation by confocal laser scanning fluorescent microscopy. The particles were found to sediment very slowly while exhibiting fluctuating motion. The particle sedimentation rate in the high-concentration slurry with the aqueous glycerol solution (η=0.068Pa·s) and a particle volume fraction on the order of 0.3 was determined to be 1.58 ± 0.66 μm·min−1 on the basis of the obtained image sequences for 24.9 h. In-situ observation provides a large amount of information about the sedimentation behavior of particles in condensed matter.

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Effect of interparticle forces on shear thickening of oxide suspensions

Cited by 112 publications

References 43 publications

Shear thickening of dense suspensions due to energy dissipation in lubrication layers between particles

Shear thickening of dense suspensions due to energy dissipation in lubrication layers between particles

Discontinuous shear thickening in Brownian suspensions by dynamic simulation

Particle sedimentation monitoring in high-concentration slurries

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