Viscosity bifurcation in thixotropic, yielding fluids

Coussot, Philippe; Nguyen, Q. Dzuy; Huynh, Hieu Thao; Bonn, Daniel

doi:10.1122/1.1459447

Cited by 419 publications

(297 citation statements)

References 41 publications

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“…All geometries had roughened walls in order to prevent wall slip effects during measurements. All results presented here are independent of the rheometer and geometry, indicating that wall slip was successfully prevented [8]. In Fig.…”

mentioning

confidence: 67%

Yielding and Shear Banding in Soft Glassy Materials

2010

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mentioning

confidence: 67%

Yielding and Shear Banding in Soft Glassy Materials

2010

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“…A very striking demonstration of how the simple yield stress fluid picture often fails in predicting even qualitatively the flow of actual yield stress fluids is the 'avalanche behaviour' (Coussot et al 2002a,b), which has recently been observed for thixotropic yield stress fluids and leads to the so-called 'viscosity bifurcation' (Coussot et al 2002b;Da Cruz et al 2002). One of the simplest tests to determine the yield stress of a given fluid is the so-called inclined plane test (Coussot & Boyer 1995).…”

Section: (A) Thixotropic Yield Stress Fluidsmentioning

confidence: 99%

An attempt to categorize yield stress fluid behaviour

Møller

Fall

Chikkadi

et al. 2009

Phil. Trans. R. Soc. A.

239

208

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We propose a new view on yield stress materials. Dense suspensions and many other materials have a yield stress-they flow only if a large enough shear stress is exerted on them. There has been an ongoing debate in the literature on whether true yield stress fluids exist, and even whether the concept is useful. This is mainly due to the experimental difficulties in determining the yield stress. We show that most if not all of these difficulties disappear when a clear distinction is made between two types of yield stress fluids: thixotropic and simple ones. For the former, adequate experimental protocols need to be employed that take into account the time evolution of these materials: ageing and shear rejuvenation. This solves the problem of experimental determination of the yield stress. Also, we show that true yield stress materials indeed exist, and in addition, we account for shear banding that is generically observed in yield stress fluids.

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“…Although it appears obvious that concentrated suspensions that show shear thickening also have a yield stress, we have not found literature comparing the prethickening flow behavior to a Herschel-Bulkley model as we do here. This is probably due to the fact that the yield stress is low: it is too small to be detected from a simple experiment such as an inclined plane test [15]. We can detect it relatively easily here because we use the MRI data.…”

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confidence: 99%

Shear Thickening of Cornstarch Suspensions as a Reentrant Jamming Transition

Fall

Huang

Bertrand³

et al. 2008

Phys. Rev. Lett.

250

262

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We study the rheology of cornstarch suspensions, a non-Brownian particle system that exhibits shear thickening. From magnetic resonance imaging velocimetry and classical rheology it follows that as a function of the applied stress the suspension is first solid (yield stress), then liquid, and then solid again when it shear thickens. For the onset of thickening we find that the smaller the gap of the shear cell, the lower the shear rate at which thickening occurs. Shear thickening can then be interpreted as the consequence of dilatancy: the system under flow wants to dilate but instead undergoes a jamming transition because it is confined, as confirmed by measurement of the dilation of the suspension as a function of the shear rate.

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Viscosity bifurcation in thixotropic, yielding fluids

Cited by 419 publications

References 41 publications

Yielding and Shear Banding in Soft Glassy Materials

Yielding and Shear Banding in Soft Glassy Materials

An attempt to categorize yield stress fluid behaviour

Shear Thickening of Cornstarch Suspensions as a Reentrant Jamming Transition

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