The rheology and microstructure of acicular precipitated calcium carbonate colloidal suspensions through the shear thickening transition

Egres, Ronald G.; Wagner, Norman J.

doi:10.1122/1.1895800

Cited by 189 publications

(148 citation statements)

References 43 publications

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“…This shows that the shear-induced friction mechanism introduced to explain the thickening of noncolloidal suspensions (8-13) extends to the colloidal case, giving the same qualitative rheology. The values of the onset stress obtained experimentally are typically of the order of σ on ≈ 100k B T=a 3 , however (26,38,39), which is substantially larger than the value of about 5k B T=a 3 found in Fig. 5.…”

Section: Resultsmentioning

confidence: 72%

Discontinuous shear thickening in Brownian suspensions by dynamic simulation

Mari

Seto

Morris

et al. 2015

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

169

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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Section: Resultsmentioning

confidence: 72%

Discontinuous shear thickening in Brownian suspensions by dynamic simulation

Mari

Seto

Morris

et al. 2015

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

169

117

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“…Likewise, the volume fraction at which the shear stresses diverge, and the flow of the suspension ceases (i.e. becomes jammed), has not been determined previously for non-colloidal fibres, though such measurements have been made for shear-thickening suspensions of colloidal fibres (Egres & Wagner 2005;Brown et al 2011).…”

Section: F Tapia S Shaikh J E Butler O Pouliquen and é Guazzmentioning

confidence: 99%

Rheology of concentrated suspensions of non-colloidal rigid fibres

et al. 2017

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Pressure-and volume-imposed rheology is used to study suspensions of non-colloidal, rigid fibres in the concentrated regime for aspect ratios ranging from 3 to 15. The suspensions exhibit yield stresses. Subtracting these apparent yield stresses reveals a viscous scaling for both the shear and normal stresses. The variation in aspect ratio does not affect the friction coefficient (ratio of shear and normal stresses), but increasing the aspect ratio lowers the maximum volume fraction at which the suspension flows. Constitutive laws are proposed for the viscosities and the friction coefficient close to the jamming transition.

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“…Such layer and/or string structures have been observed in numerical simulations [13] and experiments [14], and in some cases the shear thickening occurs when the structure is broken [9]. However, there are some other cases where no significant structure change are observed upon discontinuous shear thickening [15][16][17][18]. Hydrocluster formation has been proposed as an alternative origin of the shear thickening [16,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…(18). For a full analysis, an arbitrary perturbation should be allowed, but here we examine the linear stability against the restricted perturbation where the velocity is in the x-direction and the spatial dependence is only on the z coordinate:…”

Section: Linear Stability Of the Steady Flowmentioning

confidence: 99%

Fluid dynamics of dilatant fluids

2012

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Dense mixture of granules and liquid often shows a sever shear thickening and is called a dilatant fluid. We construct a fluid dynamics model for the dilatant fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the dilatant fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, instantaneous hardening upon external impact. Analysis of the model reveals that the shear thickening fluid shows an instability in a shear flow for some regime and exhibits the shear thickening oscillation, i.e. the oscillatory shear flow alternating between the thickened and the relaxed states. Results of numerical simulations are presented for one and two-dimensional systems.

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The rheology and microstructure of acicular precipitated calcium carbonate colloidal suspensions through the shear thickening transition

Cited by 189 publications

References 43 publications

Discontinuous shear thickening in Brownian suspensions by dynamic simulation

Discontinuous shear thickening in Brownian suspensions by dynamic simulation

Rheology of concentrated suspensions of non-colloidal rigid fibres

Fluid dynamics of dilatant fluids

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