Suppressing the coalescence in the multi-component lattice Boltzmann method

Farhat, H.; Lee, J. S.

doi:10.1007/s10404-011-0780-y

Cited by 9 publications

(8 citation statements)

References 14 publications

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“…As a result, the thin film cannot be supported any longer, and the two droplets eventually coalesce. The peculiar feature of the present model, which displays a disjoining pressure independent of the viscosity ratio, represents a significant improvement compared with the original model and makes it of major significance for many applications where non unit viscosity ratios are needed [43][44][45][46][47][48].…”

Section: Independence Of the Disjoining Pressure On The Viscosity Ratiomentioning

confidence: 94%

Mesoscopic model for soft flowing systems with tunable viscosity ratio

et al. 2018

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We propose a mesoscopic model of binary fluid mixtures with tunable viscosity ratio based on the two-range pseudo-potential lattice Boltzmann method, for the simulation of soft flowing systems. In addition to the short range repulsive interaction between species in the classical single-range model, a competing mechanism between the short range attractive and mid-range repulsive interactions is imposed within each species. Besides extending the range of attainable surface tension as compared with the single-range model, the proposed scheme is also shown to achieve a positive disjoining pressure, independently of the viscosity ratio. The latter property is crucial for many microfluidic applications involving a collection of disperse droplets with a different viscosity from the continuum phase. As a preliminary application, the relative effective viscosity of a pressure-driven emulsion in a planar channel is computed.

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Section: Independence Of the Disjoining Pressure On The Viscosity Ratiomentioning

confidence: 94%

Mesoscopic model for soft flowing systems with tunable viscosity ratio

et al. 2018

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“…In our previous paper, 20 we have discussed a 2D model capable of suppressing the coalescence of droplets in the lattice Boltzmann method. In this paper, we extended our modeling capabilities to 3D simulations for suspended emulsions.…”

Section: Need For a Numerical Studymentioning

confidence: 99%

“…While the multi-component lattice Boltzmann model has been proposed nearly two decades ago, 20 only recently we have developed the model to be capable of simulating multiple surfactant based droplets. 20,21 In order to achieve this, we have imposed the influence of the adhered surfactants on the drop interface by using the time-dependent surfactant concentration convection-diffusion equation 22 and used a calculated optimized force which can suppress the coalescence in surfactant covered droplets.…”

Section: Numerical Toolmentioning

confidence: 99%

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Study of aggregational characteristics of emulsions on their rheological properties using the lattice Boltzmann approach

2012

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Predicting the rheological properties of emulsions is one of the most challenging and complicated problems in material and fluid sciences. Substantial complications in prediction of rheology arise due to the deformability and aggregation of emulsions. Thus a better understanding of deformation and aggregation of emulsions can lead to a better understanding of the shear thinning region of emulsions. Though numerous experimental and theoretical studies were performed to obtain rheological correlations of emulsions, their inability to visualize and understand the droplet deformation in the presence of large volume fractions has stagnated our understanding of the shear thinning behavior of emulsions. With the aid of a numerical tool, which can help in visualizing the droplet deformation and correlate it to rheological behavior of emulsions, we have made an attempt to understand the physics behind the shear thinning behavior and also predict its rheological characteristics for emulsions at different volume fractions. In this article, we try to obtain a theoretical understanding of the influence of deformation and de-aggregation of droplets on the emulsion rheology. Simulations performed in this article using a multi-component lattice Boltzmann model are used to quantify (a) relative viscosity of emulsions with change in shear rate, (b) relative viscosity of emulsions with change in time, (c) effect of deformation of droplets on the shear thinning region in emulsions, and (d) relative viscosity of emulsions with change in volume fraction.

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“…The effects of interfacial properties on emulsions have been of great interest over a broad range of research areas [3][4][5][6][7][8][9][10]. The effects of surface-active agents on droplet deformation in a linear extensional flow at low Reynolds numbers were analysed.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations for the rheological characteristics of emulsions under several conditions including temperature, shear rate, surfactant concentration and droplet size

Choi

Lee

Baik

et al. 2014

Micro & Nano Letters

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An emulsion system was simulated under simple shear rates to analyse its rheological characteristics using the lattice Boltzmann method. The relative viscosity of an emulsion under a simple shear flow along with changes in temperature, shear rate, surfactant concentration and droplet size was calculated. The relative viscosity of emulsions decreased with increase in temperature. The shear thinning phenomena explaining the inverse proportion between shear rate and viscosity were observed. An increase in the surfactant concentration caused an increase in the relative viscosity for a decane-in-water emulsion, because the increased deformation caused by the decreased interfacial tension significantly influenced the wall shear stress. An increase in droplet size caused a decrease in the relative viscosity and smaller shear thinning behaviour because of decreased aggregational and repulsive forces within the emulsion system.

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Suppressing the coalescence in the multi-component lattice Boltzmann method

Cited by 9 publications

References 14 publications

Mesoscopic model for soft flowing systems with tunable viscosity ratio

Mesoscopic model for soft flowing systems with tunable viscosity ratio

Study of aggregational characteristics of emulsions on their rheological properties using the lattice Boltzmann approach

Numerical simulations for the rheological characteristics of emulsions under several conditions including temperature, shear rate, surfactant concentration and droplet size

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