Homogenization approach to the behavior of suspensions of noncolloidal particles in yield stress fluids

Château, Xavier; Ovarlez, Guillaume; Trung, Kien Luu

doi:10.1122/1.2838254

Cited by 196 publications

(168 citation statements)

References 30 publications

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“…In particular, the rheology of non colloidal suspensions composed of a yield-stress fluid and of neutrally-buoyant solid spheres has been explored in the dense regime [29]. The rheological measurements are in agreement with a model based on scaling arguments and homogenization methods [31,32]. A striking result is that all the data including a Newtonian test case show a perfect collapse of the friction, τ/P = μ(φ).…”

Section: Toward More Complex Particulate Systemssupporting

confidence: 60%

Rheology of dense suspensions of non colloidal particles

Guazzelli

2017

EPJ Web Conf.

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Abstract. Dense suspensions are materials with broad applications both in industrial processes (e.g. waste disposal, concrete, drilling muds, metalworking chip transport, and food processing) and in natural phenomena (e.g. flows of slurries, debris, and lava). Despite its long research history and its practical relevance, the mechanics of dense suspensions remain poorly understood. The major difficulty is that the grains interact both by hydrodynamic interactions through the liquid and by mechanical contact. These systems thus belong to an intermediate regime between pure suspensions and granular flows. We show that we can unify suspension and granular rheology under a common framework by transferring the frictional approach of dry granular media to wet suspensions of spherical particles. We also discuss non-Newtonian behavior such as normal-stress differences and shear-induced migration. Beyond the classical problem of dense suspension of hard spheres which is far from being completely resolved, there are also entirely novel avenues of study concerning more complex mixtures of particles and fluids such as those involving other types of particles (e.g. fibers) or non-Newtonian fluids that we will also address.

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Section: Toward More Complex Particulate Systemssupporting

confidence: 60%

Rheology of dense suspensions of non colloidal particles

Guazzelli

2017

EPJ Web Conf.

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“…Therefore, it needs to be carefully investigated the effect of particle concentration on plastic viscosity. It is noting that in this study, to take into account the particle shape effects on plastic viscosity, instead of using estimate of Chateau et al (2008) like yield stress estimate, Farris (1968) theory developed for multimodal suspension was extended. Farris (1968) developed a theory for calculating the viscosity of multimodal suspensions.…”

Section: Yield Stressmentioning

confidence: 99%

Numerical Prediction on the Effects of the Coarse Aggregate Size to the Pipe Flow of Pumped Concrete

Choi

2014

ACT

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The objective of this study is to numerically investigate the effects of coarse aggregate size on the pumpability of concrete. In actual construction of super-structures, the coarse aggregate size plays a determining factor on concrete pumping. Thus, depending on the coarse aggregate sizes, the properties of lubrication layer which is the major role facilitating concrete pumping, were numerically simulated using shear-induced particle migration analysis. Moreover, the particle shape effects according to the coarse aggregate sizes were also considered in numerical simulation to precisely simulate the actual flow conditions. For verification, 1,000m long full-scale tests with three different coarse aggregate sizes (10, 20 and 25mm) were conducted and compared with numerical results. It could be found that when concrete is being pumped, the rheological properties of concrete and lubrication layer highly depend on the coarse aggregate size, which consequently influences the flow condition of pumped concrete, whereas the thickness of lubrication layer remained almost constant irrespective of the coarse aggregate sizes.

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“…Cement pastes are yield stress fluids [2,3,23], meaning that the material flow is initiated as soon as the applied stress exceeds the yield stress. Depending on the mixture proportioning and applied shear rate or shear stress, cement pastes may display shear thinning or shear thickening behaviour [2,[7][8][9].…”

Section: General Approach 31mentioning

confidence: 99%

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

et al. 2017

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The science of rheology is increasingly used to describe the properties of fresh cement paste. Compared to standard workability tests, rheological properties allow for more fundamental investigation, more precise phenomenological description of flow properties and serve as input for numerical simulations. Standard commercially available rheometers are typically used to perform those measurements. However, the results of the measurement depend on the geometry, testing procedure and a number of potential artefacts. This technical letter describes the most common techniques and procedures used to assess the rheological properties of cement paste, as well as challenges during measurements and actions to counter these challenges.

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Homogenization approach to the behavior of suspensions of noncolloidal particles in yield stress fluids

Cited by 196 publications

References 30 publications

Rheology of dense suspensions of non colloidal particles

Rheology of dense suspensions of non colloidal particles

Numerical Prediction on the Effects of the Coarse Aggregate Size to the Pipe Flow of Pumped Concrete

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

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