Enhanced interfacial deformation in a Marangoni flow: A measure of the dynamical surface tension

Rodrigo Leite Pinto, Sébastien Le Roux, Isabelle Cantat, and Arnaud Saint-Jalmes
Phys. Rev. Fluids 3, 024003 – Published 20 February 2018
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Abstract

We investigate the flows and deformations resulting from the deposition of a water soluble surfactant at a bare oil-water interface. Once the surfactant is deposited, we show that the oil-water interface is deformed with a water bump rising upward into the oil. For a given oil, the maximal deformation—located at the surfactant deposition point—decreases with the oil-layer thickness. We also observe a critical oil-layer thickness below which the deformation becomes as large as the oil layer, leading to the rupture of this layer and an oil-water dewetting. Experimentally, it is found that this critical thickness depends on the oil density and viscosity. We then provide an analytical modelization that explains quantitatively all these experimental features. In particular, our analysis allows us to derive an analytical relationship between the vertical profile of the oil-water interface and the in-plane surface tension profile. Therefore, we propose that the monitoring of the interface vertical shape can be used as a new spatially resolved tensiometry technique.

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  • Received 21 June 2017

DOI:https://doi.org/10.1103/PhysRevFluids.3.024003

©2018 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Rodrigo Leite Pinto, Sébastien Le Roux, Isabelle Cantat, and Arnaud Saint-Jalmes

  • Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France

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Issue

Vol. 3, Iss. 2 — February 2018

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