We examine the motion of a liquid-air meniscus 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.
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March 2012
Research Article|
March 26 2012
Disorder-induced hysteresis and nonlocality of contact line motion in chemically heterogeneous microchannels
Christophe Wylock;
Christophe Wylock
1
TIPs (Transfers, Interfaces, and Processes)
, Université Libre de Bruxelles C. P. 165/67, Avenue F.D. Roosevelt 50, 1050 Bruxelles, Belgium
2Department of Chemical Engineering,
Imperial College London
, London, SW7 2AZ, United Kingdom
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Marc Pradas;
Marc Pradas
2Department of Chemical Engineering,
Imperial College London
, London, SW7 2AZ, United Kingdom
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Benoit Haut;
Benoit Haut
1
TIPs (Transfers, Interfaces, and Processes)
, Université Libre de Bruxelles C. P. 165/67, Avenue F.D. Roosevelt 50, 1050 Bruxelles, Belgium
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Pierre Colinet;
Pierre Colinet
1
TIPs (Transfers, Interfaces, and Processes)
, Université Libre de Bruxelles C. P. 165/67, Avenue F.D. Roosevelt 50, 1050 Bruxelles, Belgium
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Serafim Kalliadasis
Serafim Kalliadasis
2Department of Chemical Engineering,
Imperial College London
, London, SW7 2AZ, United Kingdom
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Physics of Fluids 24, 032108 (2012)
Article history
Received:
May 10 2011
Accepted:
March 05 2012
Citation
Christophe Wylock, Marc Pradas, Benoit Haut, Pierre Colinet, Serafim Kalliadasis; Disorder-induced hysteresis and nonlocality of contact line motion in chemically heterogeneous microchannels. Physics of Fluids 1 March 2012; 24 (3): 032108. https://doi.org/10.1063/1.3696860
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