Communication Dans Un Congrès Année : 2024

Instability in a horizontal soap film

Isabelle Cantat
Corentin Tregouët
Adrien Bussonnière
Alice Gros

Résumé

The thinning of the liquid films separating bubbles in a foam or in a bubbly liquid controls the coalescence process and the foam stability, and is highly relevant in many industrial processes. The evolution of the film thickness is governed by nonlinear equations, the solutions of which are still mostly unknown. In this talk we will revisit the old problem of the ’marginal regeneration’1, an instability occurring between a flat film and a meniscus, which controls the drainage of the film. We have shown that this instability may occur in horizontal films and not only in vertical ones, as previously assumed. The resulting pattern is shown in the figure below. Figure 1: Horizontal soap film observed in fluorescence. The bright part are a few microns thick and the dark ones a few hundred nanometres. The capillary drainage induces an instability at the contact between the soap film and the meniscus: pieces of thin film are extracted from the meniscus, producing very regular hemi-circular tongs, while the thick film flows into the meniscus along the narrow channel between these tongs.

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Dates et versions

hal-05011758 , version 1 (30-03-2025)

Identifiants

  • HAL Id : hal-05011758 , version 1

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Isabelle Cantat, Corentin Tregouët, Adrien Bussonnière, Alice Gros. Instability in a horizontal soap film. 1st European Fluid Dynamics Conference (EFDC1), Sep 2024, Aachen, Germany. ⟨hal-05011758⟩
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