An experimental modeling of gravity effect on rupture of a locally heated liquid film

D. V. Zaitsev, O. A. Kabov

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This study deals with the formation of dry patches in a subcooled liquid film flowing over a locally heated plate at small positive and negative plate inclination angles with respect to the horizon. Prior to film rupture appreciable thermocapillary deformations of the film surface appear, growing with the heat flux. Upon reaching a threshold heat flux the film rupture occurs. By means of high speed imaging it is found that the process of rupture involves two stages: 1) abrupt film thinning down to a thin residual film on the heater; 2) rupture and dryout of the residual film. As the plate inclination angle is reduced the threshold heat flux required for film rupture weakly decreases, however when the angle becomes negative the threshold heat flux begins to rise dramatically, which is associated with an increase of the stabilizing hydrostatic effect due to the growth of the film thickness. The characteristic time of rupture decreases as the threshold heat flux increases. At nucleation of the dry patch the speed of contact line can be as high as 220 mm/s. The results obtained, apart from their intrinsic importance for ground-based applications, can also be of interest for microgravity research as a film flow with different relative contribution of inertia, hydrostatic and thermocapillary forces is considered.

Original languageEnglish
Pages (from-to)174-177
Number of pages4
JournalMicrogravity Science and Technology
Volume19
Issue number3-4
Publication statusPublished - 2007

Fingerprint

Rupture
Liquid films
Gravity
Gravitation
Liquid
gravitation
Heat flux
liquids
Heat Flux
Modeling
heat flux
thresholds
Hydrostatics
hydrostatics
Inclination
inclination
Angle
Patch
High-speed Imaging
Microgravity

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Mechanics of Materials
  • Computational Mechanics

Cite this

An experimental modeling of gravity effect on rupture of a locally heated liquid film. / Zaitsev, D. V.; Kabov, O. A.

In: Microgravity Science and Technology, Vol. 19, No. 3-4, 2007, p. 174-177.

Research output: Contribution to journalArticle

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