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Short and long time drop dynamics on lubricated substrates
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Mechanics, Physicochemical Fluid Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-3336-1462
2013 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 104, no 3, 34008- p.Article in journal (Refereed) Published
Abstract [en]

Liquid infiltrated solids have been proposed as functional solvent-phobic surfaces for handling single and multiphase flows. Implementation of such surfaces alters the interfacial transport phenomenon as compared to a dry substrate. To better understand the interface characteristics in such systems we study experimentally the dynamics of a pendant water drop in air that contacts a substrate coated by thin oil films. At short times the water drop is deformed by the oil that spreads onto the water-air interface, and the dynamics are characterized by inertial and viscous regimes. At late times, the the oil film under the drop relaxes either to a stable thin film or ruptures. In the thin film rupture regime, we measure the waiting time for the rupture as a function of the drop equilibrium contact angle on a dry substrate and the initial film height. The waiting time is rationalized by lubrication theory, which indicates that long-range intermolecular forces destabilize the oil-water interface and is the primary mechanism for the film drainage.

Place, publisher, year, edition, pages
2013. Vol. 104, no 3, 34008- p.
Keyword [en]
Thin Liquid-Films, Range Forces, Surfaces, Coalescence
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Other Physics Topics
URN: urn:nbn:se:kth:diva-140168DOI: 10.1209/0295-5075/104/34008ISI: 000328564200014ScopusID: 2-s2.0-84890519250OAI: diva2:689260
Swedish Research Council

QC 20140120

Available from: 2014-01-20 Created: 2014-01-17 Last updated: 2014-01-20Bibliographically approved

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Carlson, AndreasAmberg, Gustav
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