Thermocapillary structure formation in a falling film: Experiment and calculations

A. M. Frank, O. A. Kabov

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

The present experimental and numerical study is focused on regular structure formation in a film falling down a vertical plate with a built-in rectangular heater. The data on critical Marangoni number and on the wavelength of the most unstable spanwise mode depending on Reynolds and Weber numbers are obtained. The influence of heating intensity on structure geometry is also investigated. The critical Marangoni number is shown to increase nonlinearly with the increase of Reynolds number. The wavelength of the most unstable spanwise mode appears to depend weakly on Reynolds number and much stronger on Weber number. We obtained that the height of the critical two-dimensional bump is not invariant, but depends almost inversely on Reynolds number. The appearance of a reverse flow in the bump is not a criterium for instability onset. For the different fixed Reynolds number values, the structure width significantly grows with the increase of Marangoni number. Numerical results and experimental data are compared and show good enough agreement.

Original languageEnglish
Article number032107
JournalPhysics of Fluids
Volume18
Issue number3
DOIs
Publication statusPublished - 1 Mar 2006

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Keywords

  • Channel flow
  • Convection
  • Film flow
  • Flow instability
  • Flow simulation

ASJC Scopus subject areas

  • Condensed Matter Physics

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