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Dynamique d'adhésion : ménisques, films et ponts

Abstract : When two viscous films coating solid plates are brought in contact a liquid bridge propagates and eventually leads to the adhesion of the plates. As a viscous fluid pushes air of low viscosity, a stable adhesion front is expected. However, the front feeds on liquid to propagate, which results in the depletion of the neighboring layers. As a consequence of such depletion, the adhesion front destabilizes into fingers that grow by absorbing liquid laterally. The first part of this experimental thesis explores this unexpected instability. The patterns geometry is characterized and the dynamics of the adhesion front is studied. The second part adresses the model problem of a single finger of wetting liquid bridging a bath to an overhanging beam. The finger dynamics strongly depends on the liquid properties and on the width of the bridge. In addition, we show that viscous dissipation dominates either at the contact line or in the bath depending on the depth of the latter. In the last part, a model experiment aims to explore the aspiration mechanism observed in the previous sections. We investigate the rise of a meniscus induced by the contact between a solid surface and a bath of wetting liquid. We show that the depth of the reservoir governs the dynamics and we discuss the two mechanisms that are likely responsible for the feeding of the rise when the bath consist of a thin film.
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Submitted on : Tuesday, June 8, 2021 - 10:37:08 AM
Last modification on : Friday, August 5, 2022 - 11:54:23 AM
Long-term archiving on: : Thursday, September 9, 2021 - 6:30:05 PM

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  • HAL Id : tel-03253141, version 1

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Manon L'Estimé. Dynamique d'adhésion : ménisques, films et ponts. Mécanique des fluides [physics.class-ph]. Sorbonne Université, 2021. Français. ⟨NNT : 2021SORUS006⟩. ⟨tel-03253141⟩

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