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Thin-film Rayleigh–Taylor instability in the presence of a deep periodic corrugated wall

Published online by Cambridge University Press:  23 November 2021

B. Dinesh Open the ORCID record for B. Dinesh [Opens in a new window] ,
T. Corbin  and
R. Narayanan
B. Dinesh*
Affiliation:
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
T. Corbin
Affiliation:
Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27606, USA
R. Narayanan
Affiliation:
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
*
†Email address for correspondence: dbhagavatula@ufl.edu
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Abstract

Rayleigh–Taylor instability of a thin liquid film overlying a passive fluid is examined when the film is attached to a periodic wavy deep corrugated wall. A reduced-order long-wave model shows that the wavy wall enhances the instability toward rupture when the interface pattern is sub-harmonic to the wall pattern. An expression that approximates the growth constant of instability is obtained for any value of wall amplitude for the special case when the wall consists of two full waves and the interface consists of a full wave. Nonlinear computations of the interface evolution show that sliding is arrested by the wavy wall if a single liquid film residing over a passive fluid is considered but not necessarily when a bilayer sandwiched by a top wavy wall and bottom flat wall is considered. In the latter case interface tracking shows that primary and secondary troughs will evolve and subsequently slide along the flat wall due to symmetry-breaking. It is further shown that this sliding motion of the interface can ultimately be arrested by the top wavy wall, depending on the holdup of the fluids. In other words, there exists a critical value of the interface position beyond which the onset of the sliding motion is observed and below which the sliding is always arrested.

JFM classification

Interfacial Flows (free surface): Thin films Interfacial Flows (free surface): Capillary flows
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 931 , 25 January 2022 , R5
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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Dinesh et al. supplementary movie 1

Sliding motion of a thin layer of water suspended from a flat wall due to Rayleigh-Taylor instability
Download Dinesh et al. supplementary movie 1(Video)
Video 78.2 MB

Dinesh et al. supplementary movie 2

Arresting sliding motion of the free surface of a thin layer of water suspended from a wavy wall. Here the initial perturbation is out of phase with the shape of the wavy wall

Download Dinesh et al. supplementary movie 2(Video)
Video 6.8 MB

Dinesh et al. supplementary movie 3

Arresting sliding motion of the free surface of a thin layer of water suspended from a wavy wall. Here the initial perturbation is in phase with the shape of the wavy wall

Download Dinesh et al. supplementary movie 3(Video)
Video 3 MB

Dinesh et al. supplementary movie 4

Sliding of the interface between silicone oil (1.5 cSt bottom layer) and water (top layer) as the interface approaches the wall. Here the sliding motion is arrested due to the presence of a wavy wall

Download Dinesh et al. supplementary movie 4(Video)
Video 8.7 MB

Dinesh et al. supplementary movie 5

Sliding of the interface between silicone oil (1.5 cSt bottom layer) and water (top layer) as the interface approaches the wall. The interface continues to slide on the flat wall located at z=1

Download Dinesh et al. supplementary movie 5(Video)
Video 11.9 MB
Supplementary material: PDF

Dinesh et al. supplementary material

Supplementary data

Download Dinesh et al. supplementary material(PDF)
PDF 670.6 KB