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Capillary Levelling of Immiscible Bilayer Films

hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorBERTIN, Vincent
hal.structure.identifierMcMaster University [Hamilton, Ontario]
dc.contributor.authorLEE, Carmen
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorSALEZ, Thomas
hal.structure.identifierGulliver (UMR 7083)
dc.contributor.authorRAPHAEL, Elie
hal.structure.identifierMcMaster University [Hamilton, Ontario]
dc.contributor.authorDALNOKI-VERESS, Kari
dc.date.issued2021
dc.identifier.issn0022-1120
dc.description.abstractEnFlow in thin films is highly dependent on the boundary conditions. Here, we study the capillary levelling of thin bilayer films composed of two immiscible liquids. Specifically, a stepped polymer layer is placed atop another, flat polymer layer. The Laplace pressure gradient resulting from the curvature of the step induces flow in both layers, which dissipates the excess capillary energy stored in the stepped interface. The effect of different viscosity ratios between the bottom and top layers is investigated. We invoke a long-wave expansion of low-Reynolds-number hydrodynamics to model the energy dissipation due to the coupled viscous flows in the two layers. Good agreement is found between the experiments and the model. Analysis of the latter further reveals an interesting double crossover in time, from Poiseuille flow, to plug flow, and finally to Couette flow. The crossover time scales depend on the viscosity ratio between the two liquids, allowing for the dissipation mechanisms to be selected and finely tuned by varying this ratio.
dc.language.isoen
dc.publisherCambridge University Press (CUP)
dc.title.enCapillary Levelling of Immiscible Bilayer Films
dc.typeArticle de revue
dc.identifier.doi10.1017/jfm.2020.1045
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Matière Molle [cond-mat.soft]
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
dc.subject.halPhysique [physics]/Physique [physics]/Dynamique des Fluides [physics.flu-dyn]
dc.subject.halPhysique [physics]/Mécanique [physics]/Mécanique des matériaux [physics.class-ph]
dc.subject.halPhysique [physics]/Mécanique [physics]/Mécanique des fluides [physics.class-ph]
dc.identifier.arxiv2005.01974
bordeaux.journalJournal of Fluid Mechanics
bordeaux.pageA13
bordeaux.volume911
bordeaux.peerReviewedoui
hal.identifierhal-02560752
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02560752v1
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