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Post-pinch-off relaxation of two-dimensional droplets in a Hele-Shaw cell
Univ Orleans, Inst Sci Terre Orleans, BRGM, CNRS,UMR 7327, 1A Rue Ferollerie, F-45071 Orleans, France.;Univ Twente, MESA Inst Nanotechnol, Mesoscale Chem Syst Grp, POB 217, NL-7500 AE Enschede, Netherlands.;Univ Twente, MESA Inst Nanotechnol, BIOS Lab On A Chip Grp, POB 217, NL-7500 AE Enschede, Netherlands..
Univ Orleans, Inst Sci Terre Orleans, BRGM, CNRS,UMR 7327, 1A Rue Ferollerie, F-45071 Orleans, France..
Univ Twente, Fac Elect Engn, Math & Comp Sci EEMCS, POB 217, NL-7500 AE Enschede, Netherlands..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.
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2018 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 3, no 12, article id 124202Article in journal (Refereed) Published
Abstract [en]

We report on the shape relaxation of two-dimensional (2D) droplets, formed right after the spontaneous pinch-off of a capillary bridge droplet confined within a Hele-Shaw cell. An array of bridge droplets confined within a microchip device first undergoes neck thinning due to the evaporation-driven volume change. Subsequently, an abrupt topological change transforms each bridge droplet into a small central satellite droplet and the twin droplets pinned at the edges of the cell. We monitor the shape relaxation with high-temporal-resolution optical microscopy. Capillary action drives the 2D shape relaxation, while the viscous dissipation in the film retards it. As a result, the tip of the twin droplets exhibits a self-similar parabolic shape evolution. Based on these observations, the lubrication-approximation model accurately predicts the internal pressure evolution and the droplet tip displacement. The geometrical confinement substantially slows down the dynamics, facilitating visualization of the capillary-viscous regime, even for low-viscosity liquids. The characteristic relaxation timescale shows an explicit dependence on the confinement ratio (width/gap) and the capillary velocity of liquid. We verify the broad applicability of the model using different liquids.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 3, no 12, article id 124202
Keywords [en]
BREGEAS G, 1995, PHYSICAL REVIEW LETTERS, V75, P3886
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-241205DOI: 10.1103/PhysRevFluids.3.124202ISI: 000454193900002Scopus ID: 2-s2.0-85059410813OAI: oai:DiVA.org:kth-241205DiVA, id: diva2:1280409
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QC 20190118

Available from: 2019-01-18 Created: 2019-01-18 Last updated: 2019-04-04Bibliographically approved

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Chaudhary, Himanshu

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