Volume 104, Number 3, November 2013
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||06 December 2013|
Short and long time drop dynamics on lubricated substrates
1 School of Engineering and Applied Sciences, Harvard University - Cambridge, MA, USA
2 Department of Mechanics, Linné Flow Center, Royal Institute of Technology - Stockholm, Sweden
3 Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology Daejeon, South Korea
4 Department of Mechanical and Aerospace Engineering, Princeton University - Princeton, NJ, USA
Received: 21 September 2013
Accepted: 7 November 2013
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.
PACS: 47.55.D- – Drops and bubbles / 47.55.N- – Interfacial flows / 68.15.+e – Liquid thin films
© EPLA, 2013
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