Flow of a thin fiom over a periodic surface

Shetty, Sanat; Cerro, Ramón L.

doi:10.1016/0301-9322(93)90075-6

Cited by 43 publications

(28 citation statements)

References 7 publications

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“…The latter regions can contribute significantly to resistance in surface flows. Previous studies on wetting film statics and dynamics also illustrate this phenomenon of broadening film thickness distributions in the limit of ½ approaching zero [e.g., Philip, 1978;Shetty and Cerro, 1993].…”

Section: Resultsmentioning

confidence: 82%

Water film flow along fracture surfaces of porous rock

Tokunaga¹,

Wan²

1997

Water Resources Research

256

186

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Abstract. This study shows that hydraulic properties of individual fracture surfaces can be meaningfully defined and measured, and that water film flow is a mechanism contributing to fast, unsaturated flow in fractures. The hydraulic conductivity of an unconfined block of Bishop Tuff was measured over a range of near-zero matric potentials, where differences between hydraulic conductivities obtained without and with wax sealing of its lateral sides allowed isolation of film flow effects. Tensiometer and flux measurements showed that surface film flow in this system was significant for matric potentials greater (more positive) than about -250 Pa. In this range the average film thickness was shown to be potential dependent and proportional to the observed enhanced hydraulic conductivity. Measured average surface film thicknesses ranged from 2 to 70 tzm, with average film velocities in the range of 2 to 40 rn d -* (about 10 3 times faster than that of the pore water under unit gradient saturated flow). Our experiments demonstrate that hydraulic properties of macroscopic surfaces of porous media are quantifiable, related to surface roughness, and potentially important in the flow of water in vadose environments. This study further shows that contrary to existing conceptual models, unsaturated flow in fractures cannot generally be predicted solely on the basis of aperture distribution information. The high velocities of these surface films suggest that film flow can be an important mechanism contributing to fast flow in unsaturated fractures and macropores, especially in media characterized by low-permeability matrix and along regions of convergent flow in partially saturated fractures.

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Section: Resultsmentioning

confidence: 82%

Water film flow along fracture surfaces of porous rock

Tokunaga¹,

Wan²

1997

Water Resources Research

256

186

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“…In both of these studies, the amplitude of the wall corrugations was assumed small. This assumption was relaxed by Wang (1984), who considered film flow along a curved surface whose minimum radius of curvature is much larger than the film thickness, and by Shetty & Cerro (1993), who also compared their results with experiments. Numerous computational and experimental studies have addressed the problem of film flow along a corrugated wall.…”

Section: Introductionmentioning

confidence: 99%

Electrified viscous thin film flow over topography

et al. 2008

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The gravity-driven flow of a liquid film down an inclined wall with periodic indentations in the presence of a normal electric field is investigated. The film is assumed to be a perfect conductor, and the bounding region of air above the film is taken to be a perfect dielectric. In particular, the interaction between the electric field and the topography is examined by predicting the shape of the film surface under steady conditions. A nonlinear, non-local evolution equation for the thickness of the liquid film is derived using a long-wave asymptotic analysis. Steady solutions are computed for flow into a rectangular trench and over a rectangular mound, whose shapes are approximated with smooth functions. The limiting behaviour of the film profile as the steepness of the wall geometry is increased is discussed. Using substantial numerical evidence, it is established that as the topography steepness increases towards rectangular steps, trenches, or mounds, the interfacial slope remains bounded, and the film does not touch the wall. In the absence of an electric field, the film develops a capillary ridge above a downward step and a slight depression in front of an upward step. It is demonstrated how an electric field may be used to completely eliminate the capillary ridge at a downward step. In contrast, imposing an electric field leads to the creation of a free-surface ridge at an upward step. The effect of the electric field on film flow into relatively narrow trenches, over relatively narrow mounds, and down slightly inclined substrates is also considered.

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“…The results were also compared with theoretical correlations. Similarly, various research contributions were presented to know the influence of film flow on complex and periodic surfaces [5][6][7]. The surface of most of the structured packing contains perforations.…”

Section: Surface Featuresmentioning

confidence: 99%

Analysis of Hydrodynamics of Fluid Flow on Corrugated Sheets of Packing

Subramanian

Wozny

2012

International Journal of Chemical Engineering

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Modelling of the hydrodynamics behaviour of the liquid on the corrugated sheets of packing is studied using three-dimensional, volume-of-fluid (VOF) model that is incorporated in Ansys Fluent 12.0. The flow of three different liquids with different physical properties is modelled. A domain of corrugated sheets of packing resembling the real structured packing with little modifications in the elementary geometry is constructed using ICEM CFD 12.0. The quantitative comparisons of the wetting behavior from the simulations are in good agreement with experiments. Further, the study has been extended to understand the influence of the second corrugated sheet on the flow behavior. The contours from the simulations indicate the liquid hold-up in the crimp of two corrugated sheets, and these results are in good agreement with the earlier experimental studies performed using X-ray tomography in the literature. The result from the simulation shows that even for the high flow rate of around 811 mL/min for silicon-oil (DC5), only 60% of the corrugated sheet has been wetted. Hence, the efficiency of the existing packing can be further increased by increasing the wetted area in the corrugated sheet of packing.

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Flow of a thin fiom over a periodic surface

Cited by 43 publications

References 7 publications

Water film flow along fracture surfaces of porous rock

Water film flow along fracture surfaces of porous rock

Electrified viscous thin film flow over topography

Analysis of Hydrodynamics of Fluid Flow on Corrugated Sheets of Packing

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