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Impact of a shock wave on a heterogeneous foam film

Published online by Cambridge University Press:  10 December 2020

Quentin Raimbaud ,
Martin Monloubou ,
Steven Kerampran  and
Isabelle Cantat Open the ORCID record for Isabelle Cantat [Opens in a new window]
Quentin Raimbaud
Affiliation:
Université de Rennes, CNRS, IPR (Institut de Physique de Rennes) – UMR 6251, F-35000Rennes, France
Martin Monloubou
Affiliation:
ENSTA Bretagne, UMR CNRS 6027, Institut de Recherche Dupuy de Lôme – IRDL, F-29806Brest, France
Steven Kerampran
Affiliation:
ENSTA Bretagne, UMR CNRS 6027, Institut de Recherche Dupuy de Lôme – IRDL, F-29806Brest, France
Isabelle Cantat*
Affiliation:
Université de Rennes, CNRS, IPR (Institut de Physique de Rennes) – UMR 6251, F-35000Rennes, France
*
†Email address for correspondence: [email protected]
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Abstract

Liquid foams are, amongst other applications, used to mitigate shock waves. This aspect has received considerable attention at the macroscopic scale. However, the interaction between foam films and shock waves is still poorly understood and may be an important missing local information to build mitigation models. In this paper, we experimentally identify a new process leading to the foam film rupture, which dominates when the film thickness is sufficiently heterogeneous. Using a two-thickness film with a sharp and localised thickness gradient, we record the deformation of the interface between the thick and the thin parts. We observe the growth of an excess liquid area in the thin part and establish an analytical model and scaling laws which account for this phenomenon. Our results in this ideal configuration are consistent with actual rupture processes at stake in heterogeneous foam films.

JFM classification

Complex Fluids: Foams Compressible Flows: Shock waves Drops and Bubbles: Breakup/coalescence
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 908 , 10 February 2021 , A27
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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References

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