Fluid-dynamical model for antisurfactants

Research output: Contribution to journalArticle

6 Citations (Scopus)

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 ‘anti-surfactants’ (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 a novel instability driven by surface-tension gradients, which occurs for anti-surfactant, but not for surfactant, solutions.
LanguageEnglish
Article number043121
Number of pages13
JournalPhysical Review E
Volume93
Issue number4
DOIs
Publication statusPublished - 19 Apr 2016

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Surfactant
Fluid Model
Dynamical Model
Surface-Active Agents
Surface active agents
surfactants
Surface Tension
Surface tension
interfacial tension
Fluids
fluids
Water
Linear Stability
Alcohol
Salt
Free Surface
water
alcohols
Alcohols
Salts

Keywords

  • fluid dynamical model
  • surfactants
  • anti-surfactants
  • solutions
  • surface tension

Cite this

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title = "Fluid-dynamical model for antisurfactants",
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 ‘anti-surfactants’ (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 a novel instability driven by surface-tension gradients, which occurs for anti-surfactant, but not for surfactant, solutions.",
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Fluid-dynamical model for antisurfactants. / Conn, Justin J. A.; Duffy, Brian R.; Pritchard, David; Wilson, Stephen K.; Halling, Peter J.; Sefiane, Khellil.

In: Physical Review E, Vol. 93, No. 4, 043121, 19.04.2016.

Research output: Contribution to journalArticle

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AU - Conn, Justin J. A.

AU - Duffy, Brian R.

AU - Pritchard, David

AU - Wilson, Stephen K.

AU - Halling, Peter J.

AU - Sefiane, Khellil

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KW - anti-surfactants

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