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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Published on: October 15, 2015

A diffuse-interface method for two-phase flows with soluble surfactants.

Knut Erik Teigen1, Peng Song, John Lowengrub

  • 1Department of Energy and Process Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.

Journal of Computational Physics
|January 11, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a novel diffuse interface method for simulating soluble surfactants in two-phase flows. The approach accurately models surface tension effects and is validated for drop deformation in shear flow.

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Area of Science:

  • Fluid Dynamics
  • Computational Science
  • Surface Chemistry

Background:

  • Two-phase flow simulations involving surfactants are complex due to coupled dynamics.
  • Accurate modeling of surface tension and surfactant transport is crucial for understanding interfacial phenomena.
  • Existing methods often struggle with the solubility and dynamic interface changes of surfactants.

Purpose of the Study:

  • To develop and validate a robust computational method for simulating two-phase flows with soluble surfactants.
  • To investigate the influence of surfactant solubility on fluid dynamics at interfaces.
  • To provide a flexible framework applicable to various interfacial flow problems.

Main Methods:

  • Solving incompressible Navier-Stokes equations coupled with surfactant concentration equations.
  • Utilizing a non-linear equation of state to link surface tension and interfacial concentration.
  • Employing a diffuse interface approach with finite difference methods on adaptive grids.
  • Solving the system using a non-linear multigrid solver.

Main Results:

  • The diffuse interface method successfully captures the behavior of soluble surfactants.
  • Simulations of a drop in shear flow (2D and 3D) demonstrate the method's efficacy.
  • The impact of surfactant solubility on interfacial dynamics was analyzed.

Conclusions:

  • The presented diffuse interface method offers a computationally efficient and accurate solution for soluble surfactant-laden two-phase flows.
  • This approach simplifies implementation using standard numerical techniques.
  • The findings contribute to a better understanding of interfacial phenomena in complex fluids.