Lift-off of a conducting sessile drop in an electric field

A conducting drop in partial wetting regime, placed on the lower electrode of a parallel-plate capacitor and surrounded by a dielectric fluid, is considered. The drop, initially flattened by gravity, is elongated by the electrostatic force and possibly lifts-off when a uniform DC electric field is a...

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Bibliographic Details
Published in:Microfluidics and nanofluidics 2013-08, Vol.15 (2), p.207-218
Main Authors: Glière, A., Roux, J.-M., Achard, J.-L.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Biomedical Engineering and Bioengineering
Drops and bubbles
Engineering
Engineering Fluid Dynamics
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Nanotechnology and Microengineering
Nonhomogeneous flows
Physics
Research Paper
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Summary:A conducting drop in partial wetting regime, placed on the lower electrode of a parallel-plate capacitor and surrounded by a dielectric fluid, is considered. The drop, initially flattened by gravity, is elongated by the electrostatic force and possibly lifts-off when a uniform DC electric field is applied. The electrostatic force and the lift-off condition were calculated in two previous articles, respectively, for undeformable and for slightly deformable drops in the absence of gravity (zero Eötvos number). In this paper, numerical models are put to work to study accurately the complex lift-off process resulting from the competition between gravitational, electrical and capillary forces. Large deformations of the drop surface at any value of the Eötvos number may be addressed by such a numerical procedure. Computational results allow assessing the accuracy and limits of previous analytical and asymptotic relations.
ISSN:1613-4982
1613-4990
DOI:10.1007/s10404-013-1144-6