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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Evaporation, Dynamics and Crisis Phenomena in Thin Liquid Films Sheared by Gas in a Narrow Channel

Oleg A. Kabov
Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences, 1, Acad. Lavrentyev Ave., Novosibirsk, 630090, Russia; Institute of Power Engineering, National Tomsk Polytechnic Research University, 7, Usova Street, Tomsk, 634050, Russia; Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia

Dmitry V. Zaitsev
Kutateladze Institute of Thermophysics SB RAS, 1, Lavrentiev Ave, Novosibirsk, 630090, Russia; Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia

Yulia O. Kabova
Institute of Thermophysics, Russian Academy of Sciences, Novosibirsk 630090, Russia; Centre of Smart Interfaces, Technische Universitaet Darmstadt, 64287 Darmstadt, Germany

Vyacheslav Cheverda
Institute of thermophysics

DOI: 10.1615/IHTC15.flm.009537
pages 3347-3361


キーワード: Electronic equipment cooling, Two-phase/Multiphase flow, Thin liquid film, gas flow, critical heat flux, thermocapillary effect

要約

In the present paper, we investigate the dynamics and heat transfer of evaporating locally heated thin liquid film driven by the action of the 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 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 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.

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