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Magnetic torque-induced suppression of van-der-Waals-driven thin liquid film rupture

Published online by Cambridge University Press:  26 January 2017

E. Kirkinis
E. Kirkinis*
Affiliation:
Department of Physics, University of Washington, Seattle, WA 98195, USA
*
†Email address for correspondence: kirkinis@uw.edu
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Abstract

An ultra-thin film of a carrier liquid containing nanosize ferromagnetic particles sitting on a solid substrate and surrounded by an ambient gas phase can be acted upon, apart from viscous and capillary forces, by attractive van der Waals forces which may promote instability leading to film rupture and substrate dewetting. In this article we show that the collective rotation of the particles on the liquid–gas interface, due to a magnetic torque, competes against the instability induced by the van der Waals forces that tend to deepen depressions of the liquid. The competition between the two effects (forcing and instability) leads to the generation of a permanent nonlinear interfacial viscous–capillary wave. Thus, film rupture and substrate dewetting are both averted. This is a general effect that may also be employed to suppress other types of instabilities such as the Rayleigh–Taylor and thermocapillary instabilities. This effect has yet to be observed in experiment.

JFM classification

Waves/Free-surface Flows: Capillary waves MHD and Electrohydrodynamics: Magnetic fluids
Type
Papers
Information
Journal of Fluid Mechanics , Volume 813 , 25 February 2017 , pp. 991 - 1006
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Copyright
© 2017 Cambridge University Press 

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