Yield stress measurement of a thixotropic colloid

Ong, Ernest E.S.; O’Byrne, Sean; Liow, Jong‐Leng

doi:10.1007/s00397-019-01154-y

Cited by 27 publications

(11 citation statements)

References 73 publications

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“…Most rheological studies of aqueous XG solutions tend to consider that they are mainly insensitive to their flow history, but some slightly thixotropic (slight evolution of the viscosity with the flow duration has been reported in some case (Ong et al, 2019)). In order to clarify this point, we set up a protocol in which we control carefully the history of the material: a preshear (100 s -1 during 60 s), is applied prior to any measurement, in order to erase the flow history, which brings the sample in a reference state.…”

Section: Rheometrymentioning

confidence: 99%

“…Other authors consider the material exhibit a true yield stress (Whitcomb & Macosko, 1978), often from rough studies in a limited range of shear rates (Khalil & Jan, 2012;Rodríguez de Castro et al, 2018), and in general beyond some critical concentration (Dakhil et al, 2019;Song et al, 2006), which was associated with a sufficient number of hydrogen bonds (Song et al, 2006). Finally various techniques for obtaining the yield stress were explored by Ong, which do not always give consistent results, and some thixotropic behavior was suggested (Ong et al, 2019), showing that more studies are needed to clarify the steady state and transient flow properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

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Yielding and rheopexy of aqueous xanthan gum solutions

et al. 2021

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Xanthan gum (XG) is widely used in cosmetic and pharmaceutic products (creams, pastes) and in oil industry (drilling fluids) as a stabilizing and/or thickening agent. In literature its rheological behavior is mainly presented as that of a shear-thinning or a yield stress fluid. Here, in order to clarify this rheological behavior we study in detail the flow characteristics during continued flow under given conditions (i.e. controlled stress) for a mass concentration ranging from 0.2 to 5 %. We are thus able to identify the apparent flow curve of the material after short flow duration and the flow curve in steady state (i.e. after long flow duration). The validity of this flow curve, determined from standard rheometry, is confirmed by Magnetic Resonance velocimetry. These materials start to exhibit a yield stress behavior beyond some critical Xanthan or salt concentration. In that case, a significant increase (by a factor up to 5) of the apparent viscosity is observed during flow in some range of stresses, before reaching steady state. This original rheopectic effect might be due, after some time of flow associated with deformation and reconfiguration of the XG molecules, to the progressive formation of intermolecular links such as hydrogen bonds and/or intermolecular association due to acetate residues.

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Section: Rheometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Yielding and rheopexy of aqueous xanthan gum solutions

et al. 2021

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“…During the experiment, different concentrations of xanthan gum solutions were used to simulate drilling fluids with yield stress [26]. After the solution is prepared, its rheology is measured with a Physica MCR rheometer.…”

Section: Experimental Materials and Propertiesmentioning

confidence: 99%

“…Concentration. Suspended bubbles are mainly affected by buoyancy, yield stress, gas-liquid interface pressure difference, and surface tension [26]. With the decrease of the pressure in the experimental column, the liquid pressure outside the gas-liquid interface of the suspended bubble decreases, the pressure difference between the inside and outside of the gas-liquid interface increases, and the gas-liquid interface expands under the pressure in the bubble.…”

Section: Effect Of the Bubble Size On Critical Suspensionmentioning

confidence: 99%

Experimental Study on the Suspension Amount of Invasion Gas in Drilling Fluid with Yield Stress

Liu

Jin

Guo³

2021

Geofluids

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The gas suspension phenomenon caused by the yield stress of the drilling fluid affects the accurate calculation of wellbore pressure after gas invasion. At present, most studies on the bubble suspension in the yield stress fluid focus on the single-bubble suspension condition and there are few studies on the gas suspension concentration. This paper carried out the GSC (gas suspension concentration) experiment in the simulated drilling fluid, xanthan solution, with different gas invasion methods. The GSC in the drilling fluid under the conditions of diffuse gas invasion and differential pressure gas invasion was simulated by using two methods of stir-depressurization and continuous ventilation. The results showed that when the size of a single bubble satisfied the single-bubble suspension condition, multiple bubbles can be suspended at the same time. The GSC is affected by the average size of the suspended bubbles, the yield stress of the drilling fluid, and the gas invasion modes. For different gas invasion modes, the empirical models of critical GSC related to the dimensionless number Bi are established. Compared with the experimental data, the relative error of the critical GSC in diffuse gas invasion is less than 6% and the relative error of the critical GSC in differential pressure gas invasion is less than 10%. The results of this work can provide guiding significance for accurate calculation of wellbore pressure.

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“…The study of yield stress fluids and, in particular, the questions related to their transition from solid-like behavior in static condition to liquid-like behavior in viscoelastic kinetic condition, the existence or not of thixotropy, the timedependent effects, the discordance of results obtained with different measurement methods, and the use of new measurement technologies (Balhoff et al 2011;Bonn and Denn 2009;Bonn et al 2017;Choi et al 2011;Coussot 2014;Coussot et al 2017;Dinkgreve et al 2016;Jönkkäri and Syrjälä 2010;Ong et al 2019;Owens et al 2020;Sun and Gunasekaran 2009;Ulicny and Golden 2007) have been object of several investigations from some decades to today.…”

Section: Introductionmentioning

confidence: 99%

An alternative approach for measuring yield stress and its application in Carbopol microgel

et al. 2021

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An innovative experimental apparatus for the direct measurement of yield stress was conceived and realized. It is based on a torsion pendulum equipped with a magnetic dipole and a rotating cylinder immersed in the material to be investigated. The pendulum equilibrium state depends on the mechanical torque applied due to an external magnetic induction field, elastic reaction of the suspension wire, and shear yield stress. Experimental results are reported showing that the behavior of the pendulum rotation angle, in different equilibrium conditions, provides evidence of the yield stress presence and enables its evaluation by equilibrium equations. The dependence on time of the equilibrium approach was also studied, contributing to shed light on the relaxation effect in the transition from a fluid-like to solid-like behavior, as well as on the eventual thixotropic effects in non-Newtonian fluids. The validity of the proposed technique and related experimental apparatus was tested in aqueous Carbopol solutions, with different weight percentages. The linear procedure, combined with the effectiveness and reliability of the proposed experimental method, candidates it to be used for the study of peculiar behaviors of other yield stress complex fluid such as blood, crude waxy oils, ice slurries, and coating layer used in the food industry and also for fault sliding in geodynamics.

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Yield stress measurement of a thixotropic colloid

Cited by 27 publications

References 73 publications

Yielding and rheopexy of aqueous xanthan gum solutions

Yielding and rheopexy of aqueous xanthan gum solutions

Experimental Study on the Suspension Amount of Invasion Gas in Drilling Fluid with Yield Stress

An alternative approach for measuring yield stress and its application in Carbopol microgel

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