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Thermodiffusion as a means to manipulate liquid film dynamics on chemically patterned surfaces
, Amrita Ravi Shreyes
Published in American Institute of Physics Inc.
2017
Volume: 146
   
Issue: 21
Abstract
The model problem examined here is the stability of a thin liquid film consisting of two miscible components, resting on a chemically patterned solid substrate and heated from below. In addition to surface tension gradients, the temperature variations also induce gradients in the concentration of the film by virtue of thermodiffusion/Soret effects. We study the stability and dewetting behaviour due to the coupled interplay between thermal gradients, Soret effects, long-range van der Waals forces, and wettability gradient-driven flows. Linear stability analysis is first employed to predict growth rates and the critical Marangoni number for chemically homogeneous surfaces. Then, nonlinear simulations are performed to unravel the interfacial dynamics and possible locations of the film rupture on chemically patterned substrates. Results suggest that appropriate tuning of the Soret parameter and its direction, in conjunction with either heating or cooling, can help manipulate the location and time scales of the film rupture. The Soret effect can either potentially aid or oppose film instability depending on whether the thermal and solutal contributions to flow are cooperative or opposed to each other. © 2017 Author(s).
About the journal
JournalData powered by TypesetJournal of Chemical Physics
PublisherData powered by TypesetAmerican Institute of Physics Inc.
Open AccessNo
Concepts (14)
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    Linear stability analysis
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    Liquid films
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    Substrates
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    THERMAL DIFFUSION IN LIQUIDS
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    Van der waals forces
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    CHEMICALLY PATTERNED SUBSTRATES
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    CRITICAL MARANGONI NUMBERS
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    Interfacial dynamics
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    Liquid film dynamics
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    Nonlinear simulations
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    Surface tension gradient
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    Temperature variation
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    WETTABILITY GRADIENTS
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    Stability