Modelling of The Rheological Properties of Bimodal Emulsions

Cassagnau, Philippe; McKenna, Timothy F. L.

doi:10.1002/masy.200651107

Cited by 5 publications

(7 citation statements)

References 27 publications

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“…[], Barnes [], Pishvaei et al . [], and Qi and Tanner []. Most of these studies have analyzed (a) bimodal suspensions in which the main solid phase is represented by spheres of a coarse size and (b) the effect of particle size ratio on the viscosity.…”

Section: Discussionmentioning

confidence: 99%

Rheology of bimodal crystals suspensions: Results from analogue experiments and implications for magma ascent

Gaudio

2014

Geochem Geophys Geosyst

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[1] The effect of crystal size of bimodal suspensions on rheology of magmas at strain rates between 0 and 1 s 21 is studied. Suspensions consist of silicon oil and two populations of natural crystals with size 63-125 and 250-500 mm mixed in different proportions; the total solid fraction / of the mixtures is between 0.25 and 0.5. At / 0.4, finer, coarser, and bimodal suspensions display comparable viscosities. At / ! 0.4, the viscosity of the bimodal suspensions is larger than that of the unimodal ones. The bimodal suspension, made mainly of finer crystals, shows a stronger increase of viscosity with /. The addition of finer crystals to a suspension of coarser ones produces a more pronounced increase of viscosity with respect to suspensions of coarse or fine crystals alone, and of finer crystals with added coarser ones. The bimodal suspensions of coarser crystals develops yield stress at / ! 0.25, the others at / ! 0.4. It is modeled the ascent velocity in a 20 m wide dike of magmas with bimodal and unimodal populations of crystals of different size. For / 0.4, the crystal size has not effects on the ascent velocity of magmas. For / ! 0.4, the velocity of a magma with growing phenocrystals decreases as / increases less than that of a magma with forming microlites, and more of a magma with microlites and growing phenocrystals. A magma with phenocrystals and forming microlites has the lowest ascent velocity.Components: 5,492 words, 5 figures, 1 table.

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Section: Discussionmentioning

confidence: 99%

Rheology of bimodal crystals suspensions: Results from analogue experiments and implications for magma ascent

Gaudio

2014

Geochem Geophys Geosyst

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“…(16) should not be mistaken for a rigorous model, the expression quantifies an important observation in electrostatically stabilized systems: for constant surface coverage conditions, large particles can be packed closer together than smaller particles. Experimentally it has been observed that for a constant volume fraction of polymer, latexes comprised of small particles will be more viscous than latexes comprised of large particles [32]. However, Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The packing model developed by Pishvaei et al [32] has been extended to provide a means of estimating the rheological parameters of broader, more realistic PSDs. The utility of the framework is demonstrated by using the zone-byzone PSD information to explain some of the trends seen in the time-evolution of the volume-averaged PSDs and the PSD of the final product.…”

Section: Discussionmentioning

confidence: 99%

“…Pishvaei demonstrated that Eqs. (9)- (15) provide reasonable estimates of the loading limits and latex viscosity for bimodal systems based on estimates of these properties from related monodisperse latexes [32]. In this work, the model is extended to work with multimodal PSDs in which the distributions are broader.…”

Section: Latex Rheologymentioning

confidence: 97%

“…The maximum packing fraction of a polymer latex made up of m discrete particle sizes can be calculated using a model proposed by Pishvaei et al [32]. The advantage of this model is that it eliminates the need for experimental data beyond the determination of the effective maximum packing fractions (f m,i ) and the PSD.…”

Section: Latex Rheologymentioning

confidence: 99%

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Development of a Computational Framework to Model the Scale‐up of High‐Solid‐Content Polymer Latex Reactors

Pohn

Heniche²,

Fradette³

et al. 2010

Chem Eng & Technol

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A computational framework, consisting of a laminar computational fluid dynamics (CFD) simulation model coupled to a multizonal population balance, is developed to assist in the scale-up of high-solid-content (HSC) latex production and processing. Poly3D CFD software is used to generate flow fields inside a series of reactors; this information is then sent to the process model to assess the impact of nonhomogeneous mixing on the evolution of the latex particle size distribution (PSD) when concentrated latex suspension is altered via the addition of a coagulant. As the general shape of the PSD evolves, the model monitors changes in the rheological parameters in each zone of the reactor; the flow field is recomputed if a significant change in any of the properties is detected. The details of the framework are presented and its utility is demonstrated. Preliminary results indicate that nonhomogeneity inside the reactor will have an effect on the final latex PSD obtained.

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Computational Analysis of Mixing and Scale‐Up in Emulsion Polymerization Reactors

Pohn

Heniche²,

Fradette³

et al. 2011

Macromolecular Symposia

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Summary: A hybrid multi‐zonal/computational fluid dynamics (CFD) framework is currently being developed to aid in the scale‐up of high solid content latex production and processing. Poly3D, a commercial laminar CFD code tailored to modelling the mixing of non‐Newtonian fluids, has been coupled to a population balance model via a customized interface. CFD is used to generate flow fields inside a series of reactors; this information is then transferred to a multi‐zone population balance model to assess the impact of non‐homogenous mixing on the evolution of the latex particle size distribution (PSD) when concentrated latex suspension is altered via the addition of a coagulant. The rheological properties of high solid content latexes are sensitive to changes in the PSD, so the flow field is periodically updated if significant changes in the rheological properties of the latex are detected in any of the zones. The details of the models comprising the framework are presented and the utility of the framework is demonstrated.

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Modelling of The Rheological Properties of Bimodal Emulsions

Cited by 5 publications

References 27 publications

Rheology of bimodal crystals suspensions: Results from analogue experiments and implications for magma ascent

Rheology of bimodal crystals suspensions: Results from analogue experiments and implications for magma ascent

Development of a Computational Framework to Model the Scale‐up of High‐Solid‐Content Polymer Latex Reactors

Computational Analysis of Mixing and Scale‐Up in Emulsion Polymerization Reactors

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