JHA, Aditya; AMAROUCHENE, Yacine; SALEZ, Thomas

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JHA, Aditya
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

AMAROUCHENE, Yacine
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

SALEZ, Thomas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

Journal of Fluid Mechanics. 2023, vol. 977, p. A50

Cambridge University Press (CUP)

Résumé en anglais

A rigid object moving in a viscous fluid and in close proximity with an elastic wall experiences self-generated elastohydrodynamic interactions. This has been the subject of an intense research activity, with a recent and growing attention given to the particular case of elastomeric and gel-like substrates. Here, we address the situation where the elastic wall is replaced by a capillary surface. Specifically, we analyze the lubrication flow generated by the prescribed normal motion of a rigid infinite cylinder near the deformable interface separating two immiscible and incompressible viscous fluids. Using a combination of analytical and numerical treatments, we compute the emergent capillary-lubrication force at leading order in compliance, and characterize its dependencies with the interfacial tension, viscosities of the fluids, and length scales of the problem. Interestingly, we identify two main contributions: i) a velocity-dependent adhesion-like force ; ii) an acceleration-dependant inertial-like force. Our results may have implications for the mobility of colloids near complex interfaces and for the motility of confined microbiological entities.< Réduire

Projet Européen

Brownian Motion near Soft Interfaces

Project ANR

Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Frottements dans les systèmes complexes - ANR-21-CE06-0039

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Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798