PMMH’s weekly seminar is held every Friday at 11 am (map)
Sylvain Patinet
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
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Séminaire PMMH - Etienne Jambon-Puillet, LadhyX
Pendant drops on the underside of wet surfaces : growth, motion and solidification
Pendant drops spontaneously appear on the underside of wet surfaces through the Rayleigh-Taylor instability. Due to their detrimental effect on coatings and their tendency to drip, several strategies have been developed to avoid their formation and rationalized with linear stability analysis. I will first briefly show how the Rayleigh-Taylor instability can be harnessed to make patterned elastic surfaces with a tunable spacing [1] and aspect ratio [2]. However, having a fine control over the drops in the non-linear regime of the instability is hard. They are connected to a thin film with which they continuously exchange liquid. They thus have no contact line and move around easily which disrupt the pattern. I investigate these drops dynamic experimentally, numerically and theoretically with a model system that consider a single pendant drop surrounded by a uniform thin film. I will show that under smooth surfaces, a transition from growth to decay occurs as the substrate inclination angle is increased by a few degrees [3]. I will then consider uneven surfaces, and show that the underlying topography can control the drop motion via gravito-capillary pinning-like forces [4].
[1] Marthelot, J., Strong, E. F., Reis, P. M., & Brun, P. T. (2018). Designing soft materials with interfacial instabilities in liquid films. Nature communications, 9(1), 4477.
[2] Jambon-Puillet, E., Piéchaud, M. R., & Brun, P. T. (2021). Elastic amplification of the Rayleigh–Taylor instability in solidifying melts. Proceedings of the National Academy of Sciences, 118(10), e2020701118.
[3] Jambon-Puillet, E., Ledda, P. G., Gallaire, F., & Brun, P. T. (2021). Drops on the underside of a slightly inclined wet substrate move too fast to grow. Physical review letters, 127(4), 044503.
[4] Jambon-Puillet, E. (2024). Gravito-capillary pinning of pendant droplets under wet uneven surfaces. arXiv, 2403.17584.
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The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
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