Interfacial thermal fluid phenomena in thin liquid films

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

3 Цитирования (Scopus)

Выдержка

Films are ubiquitous in nature and play an important role in our daily life. The paper focuses on the recent progress that has been achieved in the interfacial thermal fluid phenomena in thin liquid films and rivulets through conducting experiments and theory. Phase shift schlieren technique, fluorescence method and infrared thermography have been used. A spanwise regular structures formation was discovered for films falling down an inclined plate with a built-in local rectangular heater. If the heating is low enough, a stable 2D flow with a bump at the front edge of the heater is observed. For lager heat flux this primary flow becomes unstable, and the instability leads to another steady 3D flow, which looks like a regular structure with a periodically bent leading bump and an array of longitudinal rolls or rivulets descending from it downstream. The heat flux needed for the onset of instability grows almost linearly with the increase of Re number. Strong surface temperature gradients up to 10-15 K/mm, both in the streamwise and spanwise directions have been measured. For a wavy film it was found that heating may increase the wave amplitude because thermocapillary forces are directed from the valley to the crest of the wave. Thin and very thin (less than 10 μm) liquid films driven by a forced gas/vapor flow (stratified or annular flows), i.e. shear-driven liquid films in a narrow channel are a promising candidate for the thermal management of advanced semiconductor devices in earth and space applications. Development of such technology requires significant advances in fundamental research, since the stability of joint flow of locally heated liquid film and gas is a rather complex problem. Experiments with water and FC-72 in flat channels (height 0.2-2 mm) have been conducted. Maps of flow regimes were plotted. It was found that stratified flow exists and stable in the channels with 0.2 mm height and 40 mm width. The critical heat flux for a shear driven film may be up to 10 times higher than that for a falling liquid film, and reaches 400 W/cm2 in experiments with water at atmospheric pressure. Some experiments have been done during parabolic flight campaigns of the European Space Agency under microgravity conditions. It was found that decreasing of gravity leads to a flow destabilization.

Язык оригиналаАнглийский
Название основной публикации2010 14th International Heat Transfer Conference, IHTC 14
Страницы229-249
Число страниц21
Том8
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

Отпечаток

Liquid films
Thin films
Fluids
Heat flux
Gases
Experiments
Heating
Beer
Water
Space applications
Microgravity
Shear flow
Semiconductor devices
Phase shift
Temperature control
Thermal gradients
Atmospheric pressure
Gravitation
Earth (planet)
Fluorescence

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Цитировать

Kabov, O. A. (2010). Interfacial thermal fluid phenomena in thin liquid films. В 2010 14th International Heat Transfer Conference, IHTC 14 (Том 8, стр. 229-249) https://doi.org/10.1115/IHTC14-22959

Interfacial thermal fluid phenomena in thin liquid films. / Kabov, Oleg A.

2010 14th International Heat Transfer Conference, IHTC 14. Том 8 2010. стр. 229-249.

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

Kabov, OA 2010, Interfacial thermal fluid phenomena in thin liquid films. в 2010 14th International Heat Transfer Conference, IHTC 14. том. 8, стр. 229-249, Washington, DC, Соединенные Штаты Америки, 8.8.10. https://doi.org/10.1115/IHTC14-22959
Kabov OA. Interfacial thermal fluid phenomena in thin liquid films. В 2010 14th International Heat Transfer Conference, IHTC 14. Том 8. 2010. стр. 229-249 https://doi.org/10.1115/IHTC14-22959
Kabov, Oleg A. / Interfacial thermal fluid phenomena in thin liquid films. 2010 14th International Heat Transfer Conference, IHTC 14. Том 8 2010. стр. 229-249
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