The effect of wave formation and wetting angle on the thermocapillary breakdown of a falling liquid film

D. V. Zaitsev, O. A. Kabov, V. V. Cheverda, N. S. Bufetov

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

An experimental investigation is performed of the breakdown of a liquid film flowing down a vertical plate with a heater sized 150×150 mm. The main parameters which are varied in the experiment are the Reynolds number Re = 0.47 to 331 and the heat flux q = 0 to 1.92 W/cm 2. It is found that the effect of the heat flux on the wave motion of the liquid film causes the formation of a jet flow. Dry spots are formed in the region of thin film between the jets. For the purpose of investigating the effect of wave formation on the film breakdown, the distance between the nozzle and heater is varied from 41.5 to 200 mm. It is found that the distance between the nozzle and heater defines the hydrodynamics of the liquid at relatively low heat fluxes, but has no appreciable effect on the heat flux at which the film breakdown occurs. Different working liquids and coatings of the working surface are used in the experiments to investigate the effect of the wetting angle on the film breakdown. The equilibrium wetting angle is measured by the "bubble" method. No effect of the equilibrium wetting angle on the nonisothermal breakdown of the film was revealed.

Original languageEnglish
Pages (from-to)450-456
Number of pages7
JournalHigh Temperature
Volume42
Issue number3
DOIs
Publication statusPublished - 1 May 2004

Fingerprint

Liquid films
falling
wetting
Wetting
Heat flux
breakdown
heat flux
liquids
heaters
Nozzles
nozzles
Liquids
Reynolds number
Hydrodynamics
jet flow
Experiments
Thin films
Coatings
bubbles
hydrodynamics

Keywords

  • effect of the heat flux
  • film breakdown
  • vertical plate with a heater

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)

Cite this

The effect of wave formation and wetting angle on the thermocapillary breakdown of a falling liquid film. / Zaitsev, D. V.; Kabov, O. A.; Cheverda, V. V.; Bufetov, N. S.

In: High Temperature, Vol. 42, No. 3, 01.05.2004, p. 450-456.

Research output: Contribution to journalArticle

Zaitsev, D. V. ; Kabov, O. A. ; Cheverda, V. V. ; Bufetov, N. S. / The effect of wave formation and wetting angle on the thermocapillary breakdown of a falling liquid film. In: High Temperature. 2004 ; Vol. 42, No. 3. pp. 450-456.
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