Capillary-lubrication force exerted on a 2D particle moving towards a fluid interface
Language
en
Article de revue
This item was published in
Journal of Fluid Mechanics. 2023, vol. 977, p. A50
Cambridge University Press (CUP)
English Abstract
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 ...Read more >
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.Read less <
European Project
Brownian Motion near Soft Interfaces
ANR Project
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
Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Frottements dans les systèmes complexes - ANR-21-CE06-0039
Origin
Hal imported