Journal ArticleDOI
Fingering instability of thin spreading films driven by temperature gradients
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TLDR
In this paper, the authors report another example of such unstable driven flow, this time caused by the Marangoni effect, in which a temperature gradient induces a gradient of surface tension which drives the spreading process.Abstract:
THE dynamics of spreading of thin liquid films are important to many technological and biological processes, including tertiary oil recovery, coating processes, the formation and protection of microchips and biological cell interactions. The spontaneous spreading of thin liquid films under capillary forces alone is typically a slow process. An applied force—gravitational or centrifugal, or a surface shear stress—can be used to drive the spreading more quickly1,2. Recent experimental3,4 and theoretical5 studies have revealed that in all of these cases of forced spreading, the liquid front undergoes a fingering instability. Here we report another example of such unstable driven flow, this time caused by the Marangoni effect6, in which a temperature gradient induces a gradient of surface tension which drives the spreading process.read more
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Wetting and Spreading
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Light-driven motion of liquids on a photoresponsive surface
TL;DR: The light-driven motion of a fluid substance in a surface-modified glass tube suggests potential applicability to microscale chemical process systems.
Journal ArticleDOI
Dynamics and stability of thin liquid films
Richard V. Craster,Omar Matar +1 more
TL;DR: The dynamics and stability of thin liquid films have fascinated scientists over many decades: the observations of regular wave patterns in film flows along a windowpane or along guttering, the patterning of dewetting droplets, and the fingering of viscous flows down a slope are all examples that are familiar in daily life.
References
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Journal ArticleDOI
Flow and instability of a viscous current down a slope
TL;DR: In this article, a broad band of viscous fluid, uniform in depth across a slope, released so as to flow down a constant slope is considered, and an expression for the wavelength of the front is determined by surface tension and is independent of the coefficient of viscosity.
Journal ArticleDOI
Surface-Tension-Driven Phenomena
V G Levich,V S Krylov +1 more
TL;DR: In this paper, the authors considered a variety of problems in hydrodynamics and in the theory of convective heat and mass transfer in two-phase systems with mobile interphase boundary (liquid-liquid or liquid-gas).
Journal ArticleDOI
Fingering Instabilities of Driven Spreading Films
TL;DR: In this article, it was shown that a thin film with small dynamic contact angle and driven by an external body force is unstable to the formation of fingers in the direction perpendicular to the main flow.
Journal ArticleDOI
Fingering instability of spinning drops
TL;DR: In this article, the authors report a study of fingering instability which occurs during the spreading of a spinning drop and measure the time evolution of the drop profile, the critical radius for instability onset, and the fastest growing instability wavelength.
Journal ArticleDOI
The dynamics of thin liquid films in the presence of surface‐tension gradients
V. Ludviksson,Edwin N. Lightfoot +1 more
TL;DR: The climbing of Marangoni films up vertical solid surfaces was investigated experimentally and theoretically as discussed by the authors, and the results confirmed the hypothesis that previously observed liquid films formed against gravitational forces above equilibrium menisci are produced by surface-tension inequalities.