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  Deformation and relaxation of viscous thin films under bouncing drops

Lakshman, S., Tewes, W., Harth, K., Snoeijer, J. H., & Lohse, D. (2021). Deformation and relaxation of viscous thin films under bouncing drops. Journal of Fluid Mechanics, 920: A3. doi:10.1017/jfm.2021.378.

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Genre: Journal Article

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 Creators:
Lakshman, Srinath, Author
Tewes, Walter, Author
Harth, Kirsten, Author
Snoeijer, Jacco H., Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: Thin, viscous liquid films subjected to impact events can deform. Here we investigate free-surface oil-film deformations that arise owing to the build up of air under the impacting and rebouncing of water drops. Using digital holographic microscopy, we measure the three-dimensional surface topography of the deformed film immediately after the drop rebound, with a resolution down to 20 nm.We first discuss how the film is initially deformed during impact, as a function of film thickness, film viscosity and drop impact speed. Subsequently, we describe the slow relaxation process of the deformed film after the rebound. Scaling laws for the broadening of the width and the decay of the amplitude of the perturbations are obtained experimentally and found to be in excellent agreement with the results from a lubrication analysis.We finally arrive at a detailed spatio–temporal description of the oil-film deformations that arise during the impact and rebouncing of water drops.

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Language(s): eng - English
 Dates: 2021-06-042021
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1017/jfm.2021.378
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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Publ. Info: -
Pages: 22 Volume / Issue: 920 Sequence Number: A3 Start / End Page: - Identifier: ISSN: 0022-1120
ISSN: 1469-7645