On the shape of giant soap bubbles

C. Cohen, B.D. Texier, E. Reyssat, J.H. Snoeijer, D. Quéré, C. Clanet

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    We study the effect of gravity on giant soap bubbles and show that it becomes dominant above the critical size ℓ = a2 /e0, where e0 is the mean thickness of the soap film and a = √γb/ρg is the capillary length (γb stands for vapor-liquid surface tension, and ρ stands for the liquid density). We first show experimentally that large soap bubbles do not retain a spherical shape but flatten when increasing their size. A theoretical model is then developed to account for this effect, predicting the shape based on mechanical equilibrium. In stark contrast to liquid drops, we show that there is no mechanical limit of the height of giant bubble shapes. In practice, the physicochemical constraints imposed by surfactant molecules limit the access to this large asymptotic domain. However, by an exact analogy, it is shown how the giant bubble shapes can be realized by large inflatable structures.

    Original languageEnglish
    Pages (from-to)2515-2519
    Number of pages5
    JournalProceedings of the National Academy of Sciences of the United States of America (PNAS)
    Volume114
    Issue number10
    DOIs
    Publication statusPublished - 7 Mar 2017

    Keywords

    • Marangoni stress
    • Self-similarity
    • Soap bubbles

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