Evaporation and flow dynamics of thin, shear-driven liquid films in microgap channels

O. A. Kabov, D. V. Zaitsev, V. V. Cheverda, A. Bar-Cohen

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Thin and ultra-thin shear-driven liquid films in a narrow channel are a promising candidate for the thermal management of advanced semiconductor devices in earth and space applications. Such flows experience complex, and as yet poorly understood, two-phase flow phenomena requiring significant advances in fundamental research before they could be broadly applied. This paper focuses on the results obtained in experiments with locally heated shear-driven liquid films in a flat mini-channel. A detailed map of the flow sub-regimes in a shear-driven liquid film flow of water and FC-72 have been obtained for a 2. mm channel operating at room temperature. While the water film can be smooth under certain liquid/gas flow rates, the surface of an intensively evaporating film of FC-72 is always distorted by a pattern of waves and structures. It was found, that when heated the shear-driven liquid films are less likely to rupture than gravity-driven liquid films. For shear-driven water films the critical heat flux was found of up to 10 times higher than that for a falling film, which makes shear-driven films (annular or stratified two-phase flows) more suitable for cooling applications than falling liquid films.

Original languageEnglish
Pages (from-to)825-831
Number of pages7
JournalExperimental Thermal and Fluid Science
Volume35
Issue number5
DOIs
Publication statusPublished - 1 Jul 2011
Externally publishedYes

Fingerprint

Liquid films
Evaporation
Two phase flow
Flow of water
Water
Space applications
Semiconductor devices
Temperature control
Flow of gases
Heat flux
Gravitation
Earth (planet)
Flow rate
Cooling
Liquids
Experiments

Keywords

  • CHF
  • Heat transfer
  • Local heating
  • Regimes
  • Two-phase flow

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Nuclear Energy and Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Evaporation and flow dynamics of thin, shear-driven liquid films in microgap channels. / Kabov, O. A.; Zaitsev, D. V.; Cheverda, V. V.; Bar-Cohen, A.

In: Experimental Thermal and Fluid Science, Vol. 35, No. 5, 01.07.2011, p. 825-831.

Research output: Contribution to journalArticle

Kabov, O. A. ; Zaitsev, D. V. ; Cheverda, V. V. ; Bar-Cohen, A. / Evaporation and flow dynamics of thin, shear-driven liquid films in microgap channels. In: Experimental Thermal and Fluid Science. 2011 ; Vol. 35, No. 5. pp. 825-831.
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