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  When does an impacting drop stop bouncing?

Sanjay, V., Chantelot, P., & Lohse, D. (2023). When does an impacting drop stop bouncing? The Journal of Fluid Mechanics, 958: A26. doi:10.1017/jfm.2023.55.

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Sanjay, V., Author
Chantelot, P., Author
Lohse, Detlef1, Author           
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1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: Non-wetting substrates allow impacting liquid drops to spread, recoil and take-off, provided they are not too heavy (Biance et al., J. Fluid Mech., vol. 554, 2006, pp. 47–66) or too viscous (Jha et al., Soft Matt., vol. 16, no. 31, 2020, pp. 7270–7273). In this article, using direct numerical simulations with the volume of fluid method, we investigate how viscous stresses and gravity oppose capillarity to inhibit drop rebound. Close to the bouncing to non-bouncing transition, we evidence that the initial spreading stage can be decoupled from the later retraction and take-off, allowing us to understand the rebound as a process converting the surface energy of the spread liquid into kinetic energy. Drawing an analogy with coalescence-induced jumping, we propose a criterion for the transition from the bouncing to the non-bouncing regime, namely by the condition Ohc+Boc∼1, where Ohc and Boc are the Ohnesorge number and Bond number at the transition, respectively. This criterion is in excellent agreement with the numerical results. We also elucidate the mechanisms of bouncing inhibition in the heavy and viscous drop limiting regimes by calculating the energy budgets and relating them to the drop's shape and internal flow.

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Language(s): eng - English
 Dates: 2023-03-062023
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1017/jfm.2023.55
 Degree: -

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Project name : DDD
Grant ID : 740479
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: The Journal of Fluid Mechanics
Source Genre: Journal
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Publ. Info: Cambridge [etc.] : Cambridge University Press [etc.]
Pages: - Volume / Issue: 958 Sequence Number: A26 Start / End Page: - Identifier: ISSN: 0022-1120
CoNE: https://pure.mpg.de/cone/journals/resource/954925340716_1