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Fluid-dynamical model for antisurfactants

Research output: Contribution to journalArticle

  • Justin J. A. Conn
  • Brian R. Duffy
  • David Pritchard
  • Stephen K. Wilson
  • Peter J. Halling
  • Khellil Sefiane

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Original languageEnglish
Article number043121
Number of pages11
JournalPhysical Review E
Volume93
Issue number4
DOIs
Publication statusPublished - 19 Apr 2016

Abstract

We construct a fluid-dynamical model for the flow of a solution with a free surface at which surface tension acts. This model can describe both classical surfactants, which decrease the surface tension of the solution relative to that of the pure solvent, and antisurfactants (such as many salts when added to water, and small amounts of water when added to alcohol) which increase it. We demonstrate the utility of the model by considering the linear stability of an infinitely deep layer of initially quiescent fluid. In particular, we predict the occurrence of an instability driven by surface-tension gradients, which occurs for antisurfactant, but not for surfactant, solutions.

    Research areas

  • SURFACE-TENSION, ELECTROLYTE-SOLUTIONS, LIQUID-FILM, INTERFACE, WATER, ADSORPTION, CONVECTION, DIFFUSION, TRANSPORT, EQUATION

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