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Disorder-induced hysteresis and nonlocality of contact line motion in chemically heterogeneous microchannels

Wylock, Christophe; Pradas, Marc; Haut, Benoit; Colinet, Pierre and Kalliadasis, Serafim (2012). Disorder-induced hysteresis and nonlocality of contact line motion in chemically heterogeneous microchannels. Physics of Fluids, 24(3), article no. 032108.

URL: http://scitation.aip.org/content/aip/journal/pof2/...
DOI (Digital Object Identifier) Link: https://doi.org/10.1063/1.3696860
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Abstract

We examine the motion of a liquid-airmeniscus advancing into a microchannel with chemically heterogeneous walls. We consider the case where a constant flow rate is imposed, so that the mean velocity of the interface is kept constant, and study the effects of the disorder properties on the apparent contact angle for each microchannel surface. We focus here on a large diffusivity regime, where any possible advection effect is not taken into account. To this end, we make use of a phase-field model that enables contact line motion by diffusive interfacial fluxes and takes into account the wetting properties of the walls. We show that in a regime of sufficiently low velocities, the contact angle suffers a hysteresis behavior which is enhanced by the disorder strength. We also show that the contact line dynamics at each surface of the microchannel may become largely coupled with each other when different wetting properties are applied at each wall, reflecting that the dynamics of the interface is dominated by nonlocal effects.

Item Type: Journal Item
Copyright Holders: 2012 American Institute of Physics
ISSN: 1089-7666
Extra Information: 15 pp.
Keywords: hysteresis; motion; fluid dynamics; microtechnology; contact angle; wetting; interfaces (physical sciences)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Mathematics and Statistics
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 41213
Depositing User: Marc Pradas
Date Deposited: 04 Nov 2014 09:25
Last Modified: 07 Dec 2018 10:26
URI: http://oro.open.ac.uk/id/eprint/41213
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