Short and long time drop dynamics on lubricated substrates
2013 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 104, no 3, 34008- p.Article in journal (Refereed) Published
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.
Thin Liquid-Films, Range Forces, Surfaces, Coalescence
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-140168DOI: 10.1209/0295-5075/104/34008ISI: 000328564200014ScopusID: 2-s2.0-84890519250OAI: oai:DiVA.org:kth-140168DiVA: diva2:689260
FunderSwedish Research Council
QC 201401202014-01-202014-01-172014-01-20Bibliographically approved