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Home page > Séminaires > Séminaires 2022 > MSC Seminar. November 28th. Michaël Baudoin (IEMN. Université de Lille) :"Singular properties of particle-covered interfaces : from inverse Saffman-Taylor instability to everlasting bubbles.".

MSC Seminar. November 28th. Michaël Baudoin (IEMN. Université de Lille) :"Singular properties of particle-covered interfaces : from inverse Saffman-Taylor instability to everlasting bubbles."

Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.


There will be a live diffusion with Zoom :

Monday November 28th, 11h30 in room 454 A.

Please contact Michael Berhanu to attend the visio-seminar.

Singular properties of particle-covered interfaces : from inverse Saffman-Taylor instability to everlasting bubbles.

Michaël Baudoin

IEMN (Institute of Electronics, Microelectronics and Nanotechnology) Professor at Université de Lille, Fellow from Institut Universitaire de France

Abstract : In this presentation, we will discuss how the presence of partially wetting microparticles can drastically modify the behavior of fluidic interfaces, leading to some unexpected behaviors. First, we will revisit the classic Saffman-Taylor instability : While the instability normally occurs when a less viscous fluid pushes a more viscous fluid, we will show that the presence of partially wetting particles on the walls can lead to a capillarity-driven fingering instability in the reverse situation [1]. Second, we will demonstrate that these particles also alter the dynamics of liquid fingers in capillary tubes, with a liquid film growing ahead of the front meniscus, a reverse situation compared to Bretherton. This phenomenon enables the tailored synthesis of cylindrical bubbles encapsulated in a monolayer of particles (so-called “armoured bubbles”) [2]. Finally, we will explain how ultra-long lasting air bubbles resisting drainage, evaporation and nuclei induced bursting can be simply synthesized by replacing surfactants by microparticles and water by a hygroscopic liquid [3].

Figure 1 : Inverse Saffman-Taylor fingering instability [1].

Figure 2 : Stable cylindrical armored bubble produced in a capillary tube [2].

Figure 3 : Everlasting air bubble [3].

References : [1] I. Bihi, M. Baudoin, J.E. Butler, C. Faille and F. Zoueshtiagh, Inverse Saffman-Taylor experiments with particles lead to capillarity driven fingering instabilities, Phys. Rev. Lett., 117 : 034501 (2016)

[2] F. Zoueshtiagh, M. Baudoin and D. Guerrin, Capillary tube wetting induced by particles : toward armoured bubble tailoring, Soft Matter (cover), 10 : 9403 (2014)

[3] Everlasting bubbles and liquid films resisting drainage, evaporation and nuclei-induced bursting, Phys. Rev. Fluid (Letter), 7 : L011601 (2022), highlighted in Nature and APS Physics


Contact : Équipe séminaires / Seminar team - Published on / Publié le 26 septembre


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