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Thermocapillary and electrohydrodynamic effects on the stability of dynamic contact lines

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Title: Thermocapillary and electrohydrodynamic effects on the stability of dynamic contact lines
Authors: Conroy, DT
Espin, L
Matar, OK
Kumar, S
Item Type: Journal Article
Abstract: Motivated by the need to understand how external fields influence the stability of dynamic contact lines, the linear stability of gravity-driven spreading of a thin liquid film in the presence of electric and temperature fields is studied. The film is confined from below by a flat substrate and from above by an air gap and another flat substrate. An electrostatic potential difference or temperature difference can be applied between the two substrates and the liquid is taken to be a perfect dielectric whose surface tension decreases linearly with temperature. Traveling-wave solutions are found for the film profile, and both electric and temperature fields influence the height of the capillary ridge of liquid that forms near the advancing contact line. The linear stability analysis shows that electric fields destabilize the film front to transverse perturbations and that temperature fields can either stabilize or destabilize the front, depending on the direction of the temperature gradient. An energy analysis reveals that the electric field in the capillary ridge is most responsible for the enhancement of the perturbation growth. For the case of temperature fields, the perturbed temperature gradients are the dominant mechanism through which the perturbation in film height is affected.
Issue Date: 4-Mar-2019
Date of Acceptance: 1-Mar-2019
URI: http://hdl.handle.net/10044/1/67855
DOI: https://dx.doi.org/10.1103/PhysRevFluids.4.034001
ISSN: 2469-990X
Publisher: American Physical Society
Journal / Book Title: Physical Review Fluids
Volume: 4
Issue: 3
Copyright Statement: © 2019 American Physical Society.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K003976/1
EP/L020564/1
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
TRANSIENT GROWTH
FLOW
INSTABILITIES
DROPLETS
FILMS
Publication Status: Published
Article Number: 034001
Online Publication Date: 2019-03-04
Appears in Collections:Faculty of Engineering
Chemical Engineering
Faculty of Natural Sciences