Droplet behavior in the presence of insoluble surfactants

Y.W. Stegeman; F.N. Vosse, van de; H.E.H. Meijer

doi:10.1063/1.1756168

Droplet behavior in the presence of insoluble surfactants

Y.W. Stegeman, F.N. Vosse, van de, H.E.H. Meijer

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Abstract

The time-dependent behavior of droplets in the presence of insoluble surfactants, i.e., droplet elongation in supercritical flow (capillary number Ca=0.1) and droplet breakup in a quiescent matrix, is studied using a finite element method. The interfacial tension coefficient sigma as a function of the surfactant concentration Gamma is described using the Langmuir equation of state, sigma=sigma(0)+RTGamma(infinity) ln(1-Gamma/Gamma(infinity)). For droplets in an equal viscosity system, the influence of parameters Gamma, Gamma(infinity), and the Peclet number (ratio between surfactant convection and diffusion rate) on the elongation behavior has been investigated, whereas droplet breakup is considered for various values of the Peclet number for trace concentrations Gamma

Original language	English
Pages (from-to)	2785-2796
Journal	Physics of Fluids
Volume	16
Issue number	8
DOIs	https://doi.org/10.1063/1.1756168
Publication status	Published - 2004

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title = "Droplet behavior in the presence of insoluble surfactants",

abstract = "The time-dependent behavior of droplets in the presence of insoluble surfactants, i.e., droplet elongation in supercritical flow (capillary number Ca=0.1) and droplet breakup in a quiescent matrix, is studied using a finite element method. The interfacial tension coefficient sigma as a function of the surfactant concentration Gamma is described using the Langmuir equation of state, sigma=sigma(0)+RTGamma(infinity) ln(1-Gamma/Gamma(infinity)). For droplets in an equal viscosity system, the influence of parameters Gamma, Gamma(infinity), and the Peclet number (ratio between surfactant convection and diffusion rate) on the elongation behavior has been investigated, whereas droplet breakup is considered for various values of the Peclet number for trace concentrations Gamma",

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AU - Vosse, van de, F.N.

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N2 - The time-dependent behavior of droplets in the presence of insoluble surfactants, i.e., droplet elongation in supercritical flow (capillary number Ca=0.1) and droplet breakup in a quiescent matrix, is studied using a finite element method. The interfacial tension coefficient sigma as a function of the surfactant concentration Gamma is described using the Langmuir equation of state, sigma=sigma(0)+RTGamma(infinity) ln(1-Gamma/Gamma(infinity)). For droplets in an equal viscosity system, the influence of parameters Gamma, Gamma(infinity), and the Peclet number (ratio between surfactant convection and diffusion rate) on the elongation behavior has been investigated, whereas droplet breakup is considered for various values of the Peclet number for trace concentrations Gamma

AB - The time-dependent behavior of droplets in the presence of insoluble surfactants, i.e., droplet elongation in supercritical flow (capillary number Ca=0.1) and droplet breakup in a quiescent matrix, is studied using a finite element method. The interfacial tension coefficient sigma as a function of the surfactant concentration Gamma is described using the Langmuir equation of state, sigma=sigma(0)+RTGamma(infinity) ln(1-Gamma/Gamma(infinity)). For droplets in an equal viscosity system, the influence of parameters Gamma, Gamma(infinity), and the Peclet number (ratio between surfactant convection and diffusion rate) on the elongation behavior has been investigated, whereas droplet breakup is considered for various values of the Peclet number for trace concentrations Gamma

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DO - 10.1063/1.1756168

M3 - Article

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VL - 16

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EP - 2796

JO - Physics of Fluids

JF - Physics of Fluids

IS - 8

ER -

Droplet behavior in the presence of insoluble surfactants

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