Hydrodynamic response of a surfactant-laden interface to a radial flow

We study the features of a radial Stokes flow due to a submerged jet directed toward a liquid-air interface. The presence of surface-active impurities confers to the interface an in-plane elasticity that resists the incident flow. Both analytical and numerical calculations show that a minute amount...

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Bibliographic Details
Published in:Physical review fluids 2019-12, Vol.4 (12), Article 124002
Main Authors: Bickel, T., Loudet, J.-C., Koleski, G., Pouligny, B.
Format: Article
Language:English
Subjects:
Physics
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Summary:We study the features of a radial Stokes flow due to a submerged jet directed toward a liquid-air interface. The presence of surface-active impurities confers to the interface an in-plane elasticity that resists the incident flow. Both analytical and numerical calculations show that a minute amount of surfactants is enough to profoundly alter the morphology of the flow. The hydrodynamic response of the interface is affected as well, shifting from slip to no-slip boundary condition as the surface compressibility decreases. We argue that the competition between the divergent outward flow and the elastic response of the interface may actually be used as a practical way to detect and quantify a small amount of impurities.
ISSN:2469-990X
2469-990X
DOI:10.1103/PhysRevFluids.4.124002