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

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

5 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаАнглийский
Название основной публикацииProceedings of the 15th International Heat Transfer Conference, IHTC 2014
ИздательBegell House Inc.
СостояниеОпубликовано - 2014
Событие15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Япония
Продолжительность: 10 авг 201415 авг 2014

Другое

Другое15th International Heat Transfer Conference, IHTC 2014
СтранаЯпония
ГородKyoto
Период10.8.1415.8.14

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

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  • Цитировать

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