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THESIS: A. ROUX Armoured bubbles and antibubbles and self-induced radiation pressure

A. ROUX

Soutenance : 1 July 2022
Thèse de doctorat en Acoustique, Université de Lille, ENGSYS Sciences de l’ingénierie et des systèmes,

Summary:

Les bulles de savon et les antibulles sont des objets fragiles et éphémères. Le drainage, l’évaporation, la dissolution de l’air dans le liquide ou le contact entre les films minces et des impuretés présentes dans les fluides environnants sont autant de facteurs qui entraînent rapidement leur ouverture. Dans cette thèse, nous avons montré que les bulles pouvaient être stabilisées en saturant l’interface avec des particules micrométriques et en utilisant un mélange eau/glycérol. Ces particules, en formant des ponts capillaires, suppriment le drainage tandis que le glycérol permet de compenser l’évaporation du film liquide. Les bulles « en armure » ainsi conçues présentent des temps de vie allant jusqu’à 15 mois. En immergeant une goutte couverte de particules micrométriques on peut également stabiliser des antibulles pendant plus de 80 jours. Leur vieillissement et les mécanismes d’ouverture (permettant par exemple de libérer le liquide et de faire remonter l’armure à la surface) peuvent être maîtrisés en ajustant la proportion de glycérol et le volume du film d’air qui entoure l’antibulle. Le vieillissement de ces deux objets a été rationalisé en modélisant les flux d’évaporation et d’absorption d’eau. Ces nouveaux objets offrent des perspectives pour la fabrication respectivement de capteurs d’humidité et de microtransporteurs de liquides. On propose finalement le calcul de la pression de radiation auto-induite par une bulle qui oscille radialement. Cette force s’oppose au déplacement de la bulle quand elle est en translation à petit nombre de Mach.

Abstract:

Soap bubbles and anti-bubbles are fragile and ephemeral objects. Drainage, evaporation, dissolution of air in the liquid or contact between thin films and impurities in the surrounding fluids are all factors that rapidly lead to their opening. In this thesis, we have shown that bubbles can be stabilized by saturating the interface with micrometric particles and using a water/glycerol mixture. These particles, by forming capillary bridges, suppress drainage while glycerol allows to compensate the evaporation of the liquid film. The bubbles "in armor" thus designed have lifetimes of up to 15 months. By immersing a drop covered with micrometric particles, antibubbles can also be stabilized for more than 80 days. Their aging and opening mechanisms (e.g. to release the liquid and bring the armor to the surface) can be controlled by adjusting the proportion of glycerol and the volume of the air film surrounding the antibubble. The aging of these two objects has been rationalized by modeling the evaporation and water absorption flows. These new objects offer perspectives for the fabrication of humidity sensors and liquid microtransporters respectively. Finally, we propose the calculation of the radiation pressure self-induced by a radially oscillating bubble. This force opposes the displacement of the bubble when it is in translation at small Mach number.

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