Thermocapillary instabilities in a horizontal liquid layer under partial basal slip

Katarzyna N. Kowal*, Stephen H. Davis, Peter W. Voorhees

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We investigate the onset of three-dimensional hydrothermal waves in a low-capillary-number liquid layer of arbitrary depth, bounded by a free liquid-gas interface from above and a partial slip, rigid surface from below. A selection of two-and three-dimensional hydrothermal waves, longitudinal rolls and longitudinal travelling waves, form the preferred mode of instability, which depends intricately on the magnitude of the basal slip. Partial slip is destabilizing for all modes of instability. Specifically, the minimal Marangoni number required for the onset of instability follows for each mode, where 0$]]> and is the slip parameter. In the limit of free slip, longitudinal travelling waves disappear in favour of longitudinal rolls. With increasing slip, it is common for two-dimensional hydrothermal waves to exchange stability in favour of longitudinal rolls and oblique hydrothermal waves. Two types of oblique hydrothermal waves appear under partial slip, which exchange stability with increasing slip. The oblique mode that is preferred under no slip persists and remains near longitudinal for small slip parameters.

Original languageEnglish (US)
Pages (from-to)839-859
Number of pages21
JournalJournal of fluid Mechanics
Volume855
DOIs
StatePublished - Nov 25 2018

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Keywords

  • Marangoni convection
  • convection
  • interfacial flows (free surface)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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