Droplets are ubiquitous and have been studied for a century; however, their internal flow pattern and related instabilities that occur in the course of evaporation are not fully understood yet. In this paper, we report our investigation results on an ethanol drop evaporating onto a heated substrate under weightlessness conditions and with a pinned contact line. They have been obtained from both experiments and 3D unsteady computations in order to determine what kind of instabilities develop. Our one-sided model demonstrates quantitative agreement with experiments and confirms that experimentally observed instabilities are driven by thermo-capillary stress and not by the gas convection. Post-processed infrared images drawn from computations led us to conclude that the experimentally observed thermo-convective instabilities, which look very similar to hydrothermal waves in the infrared spectrum, are actually nothing else than unsteady Benard-Marangoni instabilities.
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11 December 2017
Research Article|
December 11 2017
3D unsteady computations of evaporative instabilities in a sessile drop of ethanol on a heated substrate
Sergey Semenov;
Sergey Semenov
1
Aix-Marseille University
, IUSTI UMR 7343 CNRS, 13453 Marseille, France
2
Aix-Marseille University
, MADIREL UMR 7246 CNRS, 13013 Marseille, France
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Florian Carle;
Florian Carle
1
Aix-Marseille University
, IUSTI UMR 7343 CNRS, 13453 Marseille, France
3
Yale Quantum Institute, Yale University
, New Haven, Connecticut 06511, USA
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Marc Medale;
Marc Medale
1
Aix-Marseille University
, IUSTI UMR 7343 CNRS, 13453 Marseille, France
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David Brutin
David Brutin
a)
1
Aix-Marseille University
, IUSTI UMR 7343 CNRS, 13453 Marseille, France
4
Institut Universitaire de France
, 75231 Paris, France
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a)
Author to whom correspondence should be addressed: david.brutin@univ-amu.fr
Appl. Phys. Lett. 111, 241602 (2017)
Article history
Received:
September 27 2017
Accepted:
November 20 2017
Citation
Sergey Semenov, Florian Carle, Marc Medale, David Brutin; 3D unsteady computations of evaporative instabilities in a sessile drop of ethanol on a heated substrate. Appl. Phys. Lett. 11 December 2017; 111 (24): 241602. https://doi.org/10.1063/1.5006707
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