Evaporation and flow dynamics of thin, shear-driven liquid films in microgap channels |
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Authors: | OA Kabov DV Zaitsev VV Cheverda A Bar-Cohen |
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Institution: | a Universite Libre de Bruxelles, Chimie-Physique EP-CP165/62, Microgravity Research Center, Avenue, F.D. Roosevelt 50, Bruxelles B-1050, Belgium b Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Lavrentyev 1, Novosibirsk 630090, Russia c University of Maryland, Department of Mechanical Engineering, College Park, TherPES Laboratory, MD 20742, United States |
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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. |
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Keywords: | Two-phase flow Regimes Heat transfer Local heating CHF |
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