On a nonlinear thermocapillary effect in thin liquid layers

A. Oron, P. Rosenau

Research output: Contribution to journalArticlepeer-review

Abstract

Dilute aqueous solutions of long alcohol chains were recently found to cause a quadratic dependence of surface tension on the temperature without affecting other bulk properties of the liquid: σ=σ0Q(T-T0)2, αQ>0. The impact of such Marangoni instability on the behaviour of a thin liquid layer is studied in this work. We derive an equation describing a nonlinear spatiotemporal evolution of a thin film. The behaviour of the perturbed him in the absence of gravity, critically depends on whether the temperature T0, yielding a minimal surface tension, is attained on the surface of the film. When this is the case, a qualitatively new behaviour is observed: perturbations of the film interface may evolve into continuous steady patterns that do not rupture. Otherwise, the observed patterns due to the linear and quadratic Marangoni effects are qualitatively similar and result in the rupture of the film into separate drops.
Original languageEnglish
Pages (from-to)361 - 74
Number of pages14
JournalJournal of Fluid Mechanics
Volume273
StatePublished - 1994

Keywords

  • capillarity
  • liquid films
  • surface tension

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