Rheology of foams and highly concentrated emulsions

Cohen-Addad, Sylvie; Höhler, Reinhard

doi:10.1016/j.cocis.2014.11.003

Cited by 126 publications

(77 citation statements)

References 108 publications

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“…For very small bubbles they found a Stokes-like friction force. In the case of large bubbles, dissipation is governed by viscous flow in the meniscus and leads to a non-linear friction law, as expected for slipping bubbles with mobile liquid-gas interfaces [35,36].…”

Section: Accepted Manuscriptmentioning

confidence: 96%

Normal stress measurement in foams and emulsions in the presence of slip

Habibi

Dinkgreve

Paredes

et al. 2016

Journal of Non-Newtonian Fluid Mechanics

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Section: Accepted Manuscriptmentioning

confidence: 96%

Normal stress measurement in foams and emulsions in the presence of slip

Habibi

Dinkgreve

Paredes

et al. 2016

Journal of Non-Newtonian Fluid Mechanics

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“…In the context of foams and emulsions, earlier studies correlated microscopic properties to the overall flow behaviour, by relating the surface mobility of bubbles or droplets to the shear-rate dependence of the macroscopic viscosity 50 . However, the full picture clearly needs to take also into account long-range molecular interactions 23 . Our approach concentrates on this coupling of stress dynamics to elastic response to local rearrangements.…”

Section: Resultsmentioning

confidence: 99%

“…0.5. A visco-elastic theory of Schwartz and Princen 22 suggests in particular an exponent of n = 2/3 for the rheology of foams, however it does not take into account the elasto-plastic picture that includes the long-range elastic reponse to T1 events 23 . A complete theory for foams should obviously take into account all of the above effects including both the local properties of the dissipation process in the foam films as well as the elasto-plastic description.…”

Section: Introductionmentioning

confidence: 99%

Non-trivial rheological exponents in sheared yield stress fluids

Agoritsas

Martens

2017

Soft Matter

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In this work we discuss possible physical origins for non-trivial exponents in the athermal rheology of soft materials at low but finite driving rates. A key ingredient in our scenario is the presence of a self-consistent mechanical noise that stems from the spatial superposition of long-range elastic responses to localized plastically deforming regions. We study analytically a mean-field model, in which this mechanical noise is accounted for by a stress diffusion term coupled to the plastic activity. Within this description we show how a dependence of the shear modulus and/or the local relaxation time on the shear rate introduces corrections to the usual mean-field prediction, concerning the Herschel-Bulkley-type rheological response of exponent 1/2. This feature of the mean-field picture is then shown to be robust with respect to structural disorder and partial relaxation of the local stress. We test this prediction numerically on a mesoscopic lattice model that implements explicitly the long-range elastic response to localized shear transformations, and we conclude on how our scenario might be tested in rheological experiments.

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“…Many studies were carried out on the rheological properties of oil-water emulsions [8,9]. The findings indicated that the characteristics of emulsions greatly influence the interfacial layer structure [10].…”

Section: Introductionmentioning

confidence: 99%

Rheological characterization of crude oil-water emulsions

Nagy¹,

Elekes²,

Bartha³

et al. 2016

Epitoanyag - JSBCM

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the polymer-surfactant packages are dissolved in brine and injected into the reservoir in the ceor (chemical enhanced oil recovery) processing, where oil in water type emulsions with different stability are formed. the flow properties of emulsions and their phase separation could be significantly influenced by the flow rate of the fluid phases in the pores of the reservoir rock. the goal of this research was to determine the dynamic viscosity of settled oil-water emulsions. the measurement methods of emulsions were completed with assessment of the phase viscosity characteristics of settled emulsions by using a Brookfield rotational viscometer. Based on the test results it was found that the visually observed phase boundaries were different from that the border determined by the change of dynamic viscosity measured along the liquid column height. the latter method allows a more precise determination of the phase boundary and the ratio of the different phases. keywords: ceor, crude oil-water emulsion, method development, Brookfield viscometer

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Rheology of foams and highly concentrated emulsions

Cited by 126 publications

References 108 publications

Normal stress measurement in foams and emulsions in the presence of slip

Normal stress measurement in foams and emulsions in the presence of slip

Non-trivial rheological exponents in sheared yield stress fluids

Rheological characterization of crude oil-water emulsions

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