Viscosity effect on thermocapillary rupture of falling liquid films

Dmitry Zaitsev, Andrey Semenov, Oleg Kabov

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

3 Citations (Scopus)

Abstract

Rupture of a subcooled liquid film flowing over an inclined plate with a 150×150 mm heater is studied for a wide range of liquid viscosity (dynamic viscosity μ=(0.91-17.2)×10-3 Pa·s) and plate inclination angle with respect to the horizon (θ=3-90 deg). The main governing parameters of the experiment and their respective values are: Reynolds number Re=0.15-54, heat flux q=0-224 W/cm2. The effect of the heat flux on the film flow leads to the formation of periodically flowing rivulets and thin film between them. As the heat flux grows the film thickness between rivulets gradually decreases, and, upon reaching a certain threshold heat flux, qidp, the film ruptures in the area between the rivulets. The threshold heat flux increases with the flow rate of liquid and with the liquid viscosity, while the plate inclination angle has little effect on q idp. Criterion Kp, which is traditionally used in the literature to predict thermocapillary film rupture, was found to poorly generalize data for high viscous liquids (ethylene glycol, and aqueous solutions of glycerol) and also data for θ≤45 deg. The criterion Kp was modified by taking into account characteristic critical film thickness for film rupture under isothermal conditions (no heating), deduced from existing theoretical models. The modified criterion has allowed to successfully generalize data for whole ranges of μ, Re, θ and q, studied.

Original languageEnglish
Title of host publication2010 14th International Heat Transfer Conference, IHTC 14
Pages871-876
Number of pages6
Volume3
DOIs
Publication statusPublished - 2010
Event2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, United States
Duration: 8 Aug 201013 Aug 2010

Other

Other2010 14th International Heat Transfer Conference, IHTC 14
CountryUnited States
CityWashington, DC
Period8.8.1013.8.10

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ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Zaitsev, D., Semenov, A., & Kabov, O. (2010). Viscosity effect on thermocapillary rupture of falling liquid films. In 2010 14th International Heat Transfer Conference, IHTC 14 (Vol. 3, pp. 871-876) https://doi.org/10.1115/IHTC14-23222