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Local origin of the visco-elasticity of a millimetric elementary foam

Published online by Cambridge University Press:  13 July 2021

Adrien Bussonnière Open the ORCID record for Adrien Bussonnière [Opens in a new window]  and
Isabelle Cantat Open the ORCID record for Isabelle Cantat [Opens in a new window]
Adrien Bussonnière
Affiliation:
Université de Rennes, CNRS, IPR (Institut de Physique de Rennes) – UMR 6251, F-35000 Rennes, France
Isabelle Cantat*
Affiliation:
Université de Rennes, CNRS, IPR (Institut de Physique de Rennes) – UMR 6251, F-35000 Rennes, France
*
†Email address for correspondence: isabelle.cantat@univ-rennes1.fr
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Abstract

Liquid foam exhibits surprisingly high viscosity, higher than each of its phases. This dissipation enhancement has been rationalized by invoking either a geometrical confinement of the shear in the liquid phase, or the influence of the interface viscosity. However, a precise localization of the dissipation, and its mechanism, at the bubble scale is still lacking. With this aim, we simultaneously monitored the evolution of the local flow velocity, film thickness and surface tension of a five-film assembly, induced by different controlled deformations. These measurements allow us to build local constitutive relations for this foam elementary building block. We first show that, for our millimetric foam films, the main part of the film has a purely elastic, reversible behaviour, thus ruling out the interface viscosity in explaining the observed dissipation. We then highlight a generic frustration at the menisci, controlling the interface transfer between neighbour films and resulting in the localization of a bulk shear flow close to the menisci. A model accounting for surfactant transport in these small sheared regions is developed. It is in good agreement with the experiment, and demonstrates that most of the dissipation is localized in these domains. The length of these sheared regions, determined by the physico-chemical properties of the solution, sets a transition between a large bubble regime, in which the films are mainly stretched and compressed, and a small bubble regime, in which they are sheared. Finally, we discuss the parameter range where a model of foam viscosity could be built on the basis of these local results.

JFM classification

Complex Fluids: Foams Interfacial Flows (free surface): Thin films Non-Newtonian Flows: Viscoelasticity

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 922 , 10 September 2021 , A25
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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