Hydrodynamic coupling of surfactant-influenced gas/liquid interfaces

A. Hirsa, J. D. Gayton, G. M. Korenowski, Juan Lopez, J. Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Gas/liquid interfaces are rarely free of surfactants. In many fluid dynamic systems that involve a gas/liquid interface, the transport of mass, momentum, and energy is strongly influenced by the presence of even a minute amount of surfactant, due to the resultant viscoelasticity of the interface. In this paper we present results from a joint theoretical and experimental study of the interfacial viscoelastic properties and their coupling to subsurface fluid flow. A vorticity formulation for the stress boundary conditions, including non-constant viscoelastic properties, is derived and utilized in a numerical simulation of flow in a cylinder driven by the constant rotation of the bottom endwall with the free (top) surface covered by an insoluble surfactant. The relative effects of elastic properties, surface dilatational viscosity Ks and surface shear viscosity μs on the dynamics of the flow are discussed. The required interfacial properties which appear in the stress boundary conditions are studied through experiments, including free-surface boundary layer measurements made during the interaction of a vortex pair with a surfactant-influenced interface for the purpose of directly evaluating the surface excess viscosities (ks + μs).

Original languageEnglish (US)
Title of host publication28th Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9780000000002
StatePublished - 1997
Externally publishedYes
Event28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States
Duration: Jun 29 1997Jul 2 1997


Other28th Fluid Dynamics Conference, 1997
Country/TerritoryUnited States
CitySnowmass Village

ASJC Scopus subject areas

  • Engineering(all)


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