Viscosity effect on thermocapillary rupture of falling liquid films

Dmitry Zaitsev, Andrey Semenov, Oleg Kabov

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

3 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаАнглийский
Название основной публикации2010 14th International Heat Transfer Conference, IHTC 14
Страницы871-876
Число страниц6
Том3
DOI
СостояниеОпубликовано - 2010
Событие2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, Соединенные Штаты Америки
Продолжительность: 8 авг 201013 авг 2010

Другое

Другое2010 14th International Heat Transfer Conference, IHTC 14
СтранаСоединенные Штаты Америки
ГородWashington, DC
Период8.8.1013.8.10

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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  • Цитировать

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