Numerical Simulation of Ostwald Ripening in Emulsions

Yarranton, Harvey W.; Masliyah, J.H.

doi:10.1006/jcis.1997.5186

Cited by 26 publications

(10 citation statements)

References 12 publications

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“…This phenomenon starts only few minutes after emulsification. If creaming is a reversible phenomenon, it may also be followed by some irreversible behaviour such as coalescence (Tadros and Vincent, 1983) or Ostwald ripening (Kalbanov et al, 1990;Yarranton and Masliyah, 1997). Fig.…”

Section: Emulsions Stabilitymentioning

confidence: 99%

Turbulent liquid–liquid dispersion in SMV static mixer at high dispersed phase concentration

Lobry¹,

Theron²,

Gourdon³

et al. 2011

Chemical Engineering Science

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The aim of this paper is to investigate the influence of physico-chemical parameters on liquid-liquid dispersion at high dispersed phase concentration in Sulzer SMV TM mixer. Four different oil-in-water systems involving two different surfactants are used in order to evaluate the effect of interfacial tension, densities and viscosities ratio on mean droplets size diameters. Moreover the influence of the dispersed phase concentration on the pressure drop as well as on the droplet size distribution is investigated. Two different droplets size distribution analysis techniques are used in order to compare the resulting Sauter mean diameters. The comparison between residence time in the mixer and surfactants adsorption kinetics leads to take into account the evolution of the interfacial tension between both phases at short times. Finally experimental results are correlated as a function of dimensionless Reynolds and Weber numbers.

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Section: Emulsions Stabilitymentioning

confidence: 99%

Turbulent liquid–liquid dispersion in SMV static mixer at high dispersed phase concentration

Lobry¹,

Theron²,

Gourdon³

et al. 2011

Chemical Engineering Science

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“…which allows to make a direct connection with experimental results [30][31][32]17,33]. In population balance models, Pðn; tÞ is obtained by resolution of a differential equation of the type:…”

Section: Growthmentioning

confidence: 99%

Nucleation, growth and ageing scenarios in closed systems I: A unified mathematical framework for precipitation, condensation and crystallization

Noguera¹,

Fritz²,

Clément³

et al. 2006

Journal of Crystal Growth

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“…(ii) The surface tension is independent of droplet size or mutual solvation. The independence has been extensively used for estimating the Ostwald ripening [4][5][6][7][8][9][10] although small curvature may vary concentrations of droplets and surfactant by the Laplace pressure. (iii) Local fluctuation of the surface tension, as is noticed in color fluctuation on surface of soap bubbles, has been neglected.…”

Section: Maximum Dropletsmentioning

confidence: 99%

“…Emulsions have been regarded as unstable, kinetic systems [3]. Instability mechanisms of emulsions have been categorized [3] to be Ostwald ripening [4][5][6][7][8][9][10] caused by combination of diffusion and formation of droplets, sedimentation or floatation called creaming [11][12][13][14][15][16] which is caused by difference between the density of droplets and that of continuous phase, aggregation or flocculation [17][18][19][20][21], and coalescence [22][23][24][25][26][27][28][29][30][31][32]. Measurements of time-varying emulsions can be categorized into a change in drop size distribution and a change in location of droplets by transport [7].…”

Section: Introductionmentioning

confidence: 99%

Size-distribution of droplets in emulsions by statistical mechanics calculation

Aoki

2011

Journal of Colloid and Interface Science

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This report is concerned with theoretical demonstration of the spontaneous emulsification which has been observed in a soft contact of nitrobenzene with water without surfactant [K. Aoki, M. Li, J. Chen, T. Nishiumi, Electrochem. Commun. 11 (2009) 239]. The demonstration is based on the model of spherical oil droplets with any size in equilibrium. The droplets are composed of the smallest droplets, the total number of which is given. An assembly of small droplets has larger surface energy than that of large ones because the surface energy is proportional to the surface area. The former has larger configurational entropy than the latter because the number of small droplets is bigger than that of the large ones. Since the free energy is determined by the competition between the surface energy and the entropy, it is not clear which assembly has lower free energy. This question was solved numerically here by statistical mechanics calculation of the size distributions, which contained only a parameter of the surface energy. The results of the computation at small number of droplets were used for deriving approximate equations for extremely large number of droplets. The size distribution was localized both to the smallest and the largest droplets. The diameter of the largest droplet was estimated from the dynamics in which coalescence by diffusion of droplets is disturbed by gravitational convection. The size then predicted was of the order of micrometer, being close to experimental values.

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Numerical Simulation of Ostwald Ripening in Emulsions

Cited by 26 publications

References 12 publications

Turbulent liquid–liquid dispersion in SMV static mixer at high dispersed phase concentration

Turbulent liquid–liquid dispersion in SMV static mixer at high dispersed phase concentration

Nucleation, growth and ageing scenarios in closed systems I: A unified mathematical framework for precipitation, condensation and crystallization

Size-distribution of droplets in emulsions by statistical mechanics calculation

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