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Self-excited hydrothermal waves in evaporating sessile drops

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Original languageEnglish
Article number074103
Number of pages3
JournalApplied Physics Letters
Volume93
Issue number7
DOIs
Publication statusPublished - 18 Aug 2008

Abstract

Pattern formation driven by the spontaneous evaporation of sessile drops of methanol, ethanol, and FC-72 using infrared thermography is observed and, in certain cases, interpreted in terms of hydrothermal waves. Both methanol and ethanol drops exhibit thermal wave trains, whose wave number depends strongly on the liquid volatililty and substrate thermal conductivity. The FC- 72 drops develop cellular structures whose size is proportional to the local thickness. Prior to this work, hydrothermal waves have been observed in the absence of evaporation in shallow liquid layers subjected to an imposed temperature gradient. In contrast, here both the temperature gradients and the drop thickness vary spatially and temporally and are a natural consequence of the evaporation process. (c) 2008 American Institute of Physics.

    Research areas

  • THERMOCAPILLARY LIQUID LAYERS, PART 1, INSTABILITIES, CONVECTION

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