Abstract
Thin and ultra-thin 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. Such flows experience complex, and as yet poorly understood, two-phase flow phenomena requiring significant advances in fundamental research before they could be broadly applied. This paper focuses on the results obtained in experiments with locally heated shear-driven liquid films in a flat mini-channel. A detailed map of the flow sub-regimes in a shear-driven liquid film flow of water and FC-72 have been obtained for a 2. mm channel operating at room temperature. While the water film can be smooth under certain liquid/gas flow rates, the surface of an intensively evaporating film of FC-72 is always distorted by a pattern of waves and structures. It was found, that when heated the shear-driven liquid films are less likely to rupture than gravity-driven liquid films. For shear-driven water films the critical heat flux was found of up to 10 times higher than that for a falling film, which makes shear-driven films (annular or stratified two-phase flows) more suitable for cooling applications than falling liquid films.
| Original language | English |
|---|---|
| Pages (from-to) | 825-831 |
| Number of pages | 7 |
| Journal | Experimental Thermal and Fluid Science |
| Volume | 35 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1 Jul 2011 |
| Externally published | Yes |
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Keywords
- CHF
- Heat transfer
- Local heating
- Regimes
- Two-phase flow
ASJC Scopus subject areas
- Chemical Engineering(all)
- Nuclear Energy and Engineering
- Aerospace Engineering
- Mechanical Engineering
- Fluid Flow and Transfer Processes
Cite this
Evaporation and flow dynamics of thin, shear-driven liquid films in microgap channels. / Kabov, O. A.; Zaitsev, D. V.; Cheverda, V. V.; Bar-Cohen, A.
In: Experimental Thermal and Fluid Science, Vol. 35, No. 5, 01.07.2011, p. 825-831.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evaporation and flow dynamics of thin, shear-driven liquid films in microgap channels
AU - Kabov, O. A.
AU - Zaitsev, D. V.
AU - Cheverda, V. V.
AU - Bar-Cohen, A.
PY - 2011/7/1
Y1 - 2011/7/1
N2 - Thin and ultra-thin 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. Such flows experience complex, and as yet poorly understood, two-phase flow phenomena requiring significant advances in fundamental research before they could be broadly applied. This paper focuses on the results obtained in experiments with locally heated shear-driven liquid films in a flat mini-channel. A detailed map of the flow sub-regimes in a shear-driven liquid film flow of water and FC-72 have been obtained for a 2. mm channel operating at room temperature. While the water film can be smooth under certain liquid/gas flow rates, the surface of an intensively evaporating film of FC-72 is always distorted by a pattern of waves and structures. It was found, that when heated the shear-driven liquid films are less likely to rupture than gravity-driven liquid films. For shear-driven water films the critical heat flux was found of up to 10 times higher than that for a falling film, which makes shear-driven films (annular or stratified two-phase flows) more suitable for cooling applications than falling liquid films.
AB - Thin and ultra-thin 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. Such flows experience complex, and as yet poorly understood, two-phase flow phenomena requiring significant advances in fundamental research before they could be broadly applied. This paper focuses on the results obtained in experiments with locally heated shear-driven liquid films in a flat mini-channel. A detailed map of the flow sub-regimes in a shear-driven liquid film flow of water and FC-72 have been obtained for a 2. mm channel operating at room temperature. While the water film can be smooth under certain liquid/gas flow rates, the surface of an intensively evaporating film of FC-72 is always distorted by a pattern of waves and structures. It was found, that when heated the shear-driven liquid films are less likely to rupture than gravity-driven liquid films. For shear-driven water films the critical heat flux was found of up to 10 times higher than that for a falling film, which makes shear-driven films (annular or stratified two-phase flows) more suitable for cooling applications than falling liquid films.
KW - CHF
KW - Heat transfer
KW - Local heating
KW - Regimes
KW - Two-phase flow
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UR - http://www.scopus.com/inward/citedby.url?scp=79955723329&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2010.08.001
DO - 10.1016/j.expthermflusci.2010.08.001
M3 - Article
VL - 35
SP - 825
EP - 831
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
IS - 5
ER -