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

86 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

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

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