Evaporation, dynamics and crisis phenomena in thin liquid films sheared by gas in a narrow channel

Oleg A. Kabov, Dmitry V. Zaitsev, Yulia O. Kabova, Vechaslav V. Cheverda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

In the present paper, we investigate the dynamics and heat transfer of evaporating locally heated thin liquid film driven by the action of the gas flow in a narrow channel. Experiments with water and FC-72 in flat channels (height 1.2-2.0 mm) were conducted. Maps of flow subregimes for shear-driven film were plotted. A stable stratified flow subregime exists in minichannels with width of 40 mm. CHF for a shear driven film may be up to 10 times higher than that for a falling liquid film, and reaches more than 400 W/cm2 in experiments with water. CHF increases with the gas and liquid flow rates. The longitudinal micro-fins with the height of 0.3 and 0.5 mm may increase CHF by a factor of 3. Experimental investigations were supplemented with the theoretical one. Two-sided three dimensional mathematical model is used to study interaction and balancing of different effects on the evaporation process along the gas liquid interface and film deformations. For a deformable gas-liquid interface, convection heat transfer in the liquid and the gas phases as well as temperature dependence of surface tension and liquid viscosity are taken into account. An influence of the gas flow rate and heating intensity were investigated numerically. It is shown that mainly evaporation takes place in the vicinity of the heater. The minimum film thickness takes place near the end of the heater. Even at quite low heating intensities transversal deformations become significant and longitudinal deformations of the gas-liquid interface could be much smaller in comparison with them. The longitudinal deformations depend significantly on the value of the gas Reynolds number.

Original languageEnglish
Title of host publicationProceedings of the 15th International Heat Transfer Conference, IHTC 2014
PublisherBegell House Inc.
Publication statusPublished - 2014
Event15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Japan
Duration: 10 Aug 201415 Aug 2014

Other

Other15th International Heat Transfer Conference, IHTC 2014
CountryJapan
CityKyoto
Period10.8.1415.8.14

Fingerprint

Liquid films
Evaporation
evaporation
Thin films
liquids
Gases
gases
Liquids
gas flow
Flow of gases
heaters
Flow rate
flow velocity
Heating
heat transfer
Viscosity of liquids
Heat convection
shear
stratified flow
heating

Keywords

  • Boiling and Evaporation
  • Film cooling
  • Heat transfer enhancement
  • Two-phase flow

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Kabov, O. A., Zaitsev, D. V., Kabova, Y. O., & Cheverda, V. V. (2014). Evaporation, dynamics and crisis phenomena in thin liquid films sheared by gas in a narrow channel. In Proceedings of the 15th International Heat Transfer Conference, IHTC 2014 Begell House Inc..

Evaporation, dynamics and crisis phenomena in thin liquid films sheared by gas in a narrow channel. / Kabov, Oleg A.; Zaitsev, Dmitry V.; Kabova, Yulia O.; Cheverda, Vechaslav V.

Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc., 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kabov, OA, Zaitsev, DV, Kabova, YO & Cheverda, VV 2014, Evaporation, dynamics and crisis phenomena in thin liquid films sheared by gas in a narrow channel. in Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc., 15th International Heat Transfer Conference, IHTC 2014, Kyoto, Japan, 10.8.14.
Kabov OA, Zaitsev DV, Kabova YO, Cheverda VV. Evaporation, dynamics and crisis phenomena in thin liquid films sheared by gas in a narrow channel. In Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc. 2014
Kabov, Oleg A. ; Zaitsev, Dmitry V. ; Kabova, Yulia O. ; Cheverda, Vechaslav V. / Evaporation, dynamics and crisis phenomena in thin liquid films sheared by gas in a narrow channel. Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc., 2014.
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