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21 janvier 2019: 1 événement

  • Séminaires Invités

    Lundi 21 janvier 14:00-15:30 - Sébastien Michelin - LadHyX -- Ecole Polytechnique Palaiseau

    Life & death of microscopic gas bubbles

    Résumé : Microscopic gas bubbles grow or shrink depending on the relative saturation of their environment in dissolved gas species. This process can be seen as a coupled problem between the dissolved gas diffusion and the viscous flow around the bubble. This presentation will present some of our recent modeling work on the dynamics of growth or dissolution of microscopic gas bubbles in crowded or confined environments.
    The dissolution of a single gas bubble in an undersaturated environment is a classical problem which leads to bubble collapse in finite time. The presence of other bubbles slows this process down. Using a simplified analytical framework, the dissolution patterns are analysed for bubble lattices of different dimensions.
    Confinement also plays a key role : the growth of a confined gas bubble is in fact at the heart of several designs of artificial micro swimmers, so-called micro-rockets, which motivate the second part of the presentation, dedicated to the growth of a microscopic bubble near a wall. In particular, I will discuss how the physical properties of the bubble surface can significantly influence the drainage dynamics of the lubrication film.

    contact : Benjamin Dollet

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères

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