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Hydrothermal waves on ethanol droplets evaporating under terrestrial and reduced gravity levels

Published online by Cambridge University Press:  05 November 2012

F. Carle ,
B. Sobac  and
D. Brutin
F. Carle*
Affiliation:
Laboratoire IUSTI, UMR 7343 CNRS, Aix Marseille Université, 13013 Marseille, France
B. Sobac
Affiliation:
Laboratoire IUSTI, UMR 7343 CNRS, Aix Marseille Université, 13013 Marseille, France
D. Brutin
Affiliation:
Laboratoire IUSTI, UMR 7343 CNRS, Aix Marseille Université, 13013 Marseille, France
*
†Email address for correspondence: florian.carle@polytech.univ-mrs.fr
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Abstract

This experimental study, performed under microgravity conditions, focuses on the evaporation dynamics of ethanol drops and the formation and behaviour of the hydrothermal waves that spontaneously develop on the drop surfaces. The aim of this study is to compare our results to a similar study performed under normal gravity conditions to confirm the purely thermocapillary origin of these instabilities. A scaling law predicts with good agreement the number of instabilities that form, regardless of the gravity level.

JFM classification

Interfacial Flows (free surface): Capillary flows Convection: Marangoni convection
Type
Papers
Information
Journal of Fluid Mechanics , Volume 712 , 10 December 2012 , pp. 614 - 623
Copyright
©2012 Cambridge University Press

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Carle et al supplementary movie

Infrared visualisation of an ethanol drop under reduced gravity [TS = 35°C, P = 835 mbar, Rμg = 2.77 mm]

Download Carle et al supplementary movie(Video)
Video 9.1 MB