Liquid Film Thickness in Micro-Scale Two-Phase Flow

Shikazono, Naoki; Han, Youngbae

doi:10.5772/22394

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…Eq. (1) was corrected later to account for different effects like finiteness of δ 0 /d i ratio [Aussillous and Quéré (2000)], finiteness of the meniscus Reynolds number [Shikazono and Han (2011)], and acceleration of menisci [Han and Shikazono (2010)]. However the leading velocity dependence is defined by Eq.…”

Section: Liquid Film Deposition By Receding Meniscusmentioning

confidence: 99%

Pulsating Heat Pipes: Basics of Functioning and Modeling

Nikolayev

Marengo²

2018

Encyclopedia of Two-Phase Heat Transfer and Flow IV

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Section: Liquid Film Deposition By Receding Meniscusmentioning

confidence: 99%

Pulsating Heat Pipes: Basics of Functioning and Modeling

Nikolayev

Marengo²

2018

Encyclopedia of Two-Phase Heat Transfer and Flow IV

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“…To measure the liquid film thickness, fluorescence intensity methods use the fact that for a fixed dye mass fraction mixed in the wetting fluid, the color intensity increases as the number of dye molecules increases [38]. Laser confocal methods are usually used for dynamic measurements [39]. Despite many experiments carried out to measure liquid film thickness, quantitative data of local and instantaneous liquid film thickness are still limited [39].…”

Section: Introductionmentioning

confidence: 99%

“…Laser confocal methods are usually used for dynamic measurements [39]. Despite many experiments carried out to measure liquid film thickness, quantitative data of local and instantaneous liquid film thickness are still limited [39]. In this paper we propose an optical method to measure local liquid film thickness in capillary tubes in real time.…”

Section: Introductionmentioning

confidence: 99%

Measurements and simulation of liquid films during drainage displacements and snap-off in constricted capillary tubes

Roman

Abu-Al-Saud

Tokunaga

et al. 2017

Journal of Colloid and Interface Science

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When a wetting liquid is displaced by air in a capillary tube, a wetting film develops between the tube wall and the air that is responsible for the snap-off mechanism of the gas phase. By dissolving a dye in the wetting phase it is possible to relate a measure of the absorbance in the capillary to the thickness of liquid films. These data could be used to compare with cutting edge numerical simulations of the dynamics of snap-off for which experimental and numerical data are lacking. Drainage experiments in constricted capillary tubes were performed where a dyed wetting liquid is displaced by air for varying flow rates. We developed an optical method to measure liquid film thicknesses that range from 3 to 1000μm. The optical measures are validated by comparison with both theory and direct numerical simulations. In a constricted capillary tube we observed, both experimentally and numerically, a phenomenon of snap-off coalescence events in the vicinity of the constriction that bring new insights into our understanding and modeling of two-phase flows. In addition, the good agreement between experiments and numerical simulations gives confidence to use the numerical method for more complex geometries in the future.

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