Longitudinal flow characteristics of vertically falling liquid films without concurrent gas flow

Takahama, Heishichiro; Kato, Seizo

doi:10.1016/0301-9322(80)90011-7

Cited by 200 publications

(65 citation statements)

References 9 publications

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“…The development length predicted by equation (2.27) for these lower and upper limits of N f is, respectively, Z = 0.4D and 4.1D. The approach to equilibrium film thickness for transitional and turbulent films has been investigated experimentally (Takahama & Kato 1980;Karapantsios & Karabelas 1995), although neither of these studies specifically considers the film around Taylor bubbles. The results are complex and no general model is developed.…”

Section: (D) the Development Of The Falling Filmmentioning

confidence: 99%

The thickness of the falling film of liquid around a Taylor bubble

et al. 2011

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We present the results of laboratory experiments that quantify the physical controls on the thickness of the falling film of liquid around a Taylor bubble, when liquid-gas interfacial tension can be neglected. We find that the dimensionless film thickness l (the ratio of the film thickness to the pipe radius) is a function only of the dimensionless parameter N f = r gD 3 /m, where r is the liquid density, g the gravitational acceleration, D the pipe diameter and m the dynamic viscosity of the liquid. For N f 10, the dimensionless film thickness is independent of N f with value l ≈ 0.33; in the interval 10 N f 10 4 , l decreases with increasing N f ; for N f 10 4 film thickness is, again, independent of N f with value l ≈ 0.08. We synthesize existing models for films falling down a plane surface and around a Taylor bubble, and develop a theoretical model for film thickness that encompasses the viscous, inertial and turbulent regimes. Based on our data, we also propose a single empirical correlation for l (N f ), which is valid in the range 10 −1 < N f < 10 5 . Finally, we consider the thickness of the falling film when interfacial tension cannot be neglected, and find that film thickness decreases as interfacial tension becomes more important.

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Section: (D) the Development Of The Falling Filmmentioning

confidence: 99%

The thickness of the falling film of liquid around a Taylor bubble

et al. 2011

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“…Since it is very difficult to carry out experimental studies inside packed columns, numerous researchers pay attention to a single inclined plate (Ghiaasiaan et al, 1997;Johnso, 1999;Karimi and Kawaji, 2000;Nicolaiewsky, 1999;Saber and El-Genk, 2004;Takahama and Kato, 1980;Zapke and Kröger, 2000). Some qualitative and quantitative conclusions were drawn by the experimental observation and analysis.…”

Section: Introductionmentioning

confidence: 99%

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

Yuan

Repke

et al. 2012

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:The factors affecting the separation efficiencies of structured packed columns are multi-scale, including the macroscopic variables (eg feed rate, pressure and temperature) and the microscopic liquid flow behavior and distribution. Especially in the situation in which the second liquid phase is inevitable within distillation columns, the microscopic liquid flow behavior could lead to the uncertainty of the separation efficiencies. This work mainly focuses on the investigation of the local flow behavior of a liquid phase flowing on an inclined steel plate at different situations. On one hand, a three-dimensional CFD model based on the VOF model is developed with the commercial CFD package, FLUENT 6.3. On the other hand, the results of the experimental study are adopted to validate partially the model. Within the developed model, the influences of the liquid and gas flow rates are studied with respect to the specific wetted area, the thickness profile of film and rivulet flows as well as the average velocity of the liquid phase.

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“…However, the room temperature water needs to run at lower velocity to produce prototypical liquid metal films. Moreover, experimental water data has shown that the instantaneous film thickness could change by as much as 250% above and 50% below the mean thickness [9]. This type of surface roughness has yet to be seen experimentally with liquid metals.…”

Section: Cur6ature Of Jet Surface Protuberancesmentioning

confidence: 99%

Scaling criteria for IFE liquid wall protection scheme simulation

Ying

Abdou

1998

Fusion Engineering and Design

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Applicability of experimental results to a full-size system depends on the scaling criteria on which the test article/fluid medium is used. This paper presents a careful review and assessment of a number of key parameters which influence fluid stability phenomena relevant to the IFE wall protection schemes, and provides guidance for future simulation experiments. The analysis shows that the non-dimensional jet surface ripple size can be reproduced by simultaneously preserving prototypical jet Reynolds and Weber numbers. The results show the difficulties of using water as a simulant for liquid protectants in experiments for evaluating IFE thin and thick liquid wall protection schemes. The analysis also shows that a modified HTS salt seems a good simulant for Flibe and that liquid sodium a good simulant for liquid lead. However, in the absence of information on liquids other than water, serious questions remain concerning the issue of scaling. Nevertheless, to best utilizing the available R&D resources, further experiments should be performed using fluids with significantly lower vapor pressures, such as liquid metals or low-melting temperature salts or eutectics.

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Longitudinal flow characteristics of vertically falling liquid films without concurrent gas flow

Cited by 200 publications

References 9 publications

The thickness of the falling film of liquid around a Taylor bubble

The thickness of the falling film of liquid around a Taylor bubble

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

Scaling criteria for IFE liquid wall protection scheme simulation

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