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Droplet impact dynamics on shallow pools
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Sykes, Thomas C., Cimpeanu, Radu, Fudge, Ben D., Castrejón-Pita, J. Rafael and Castrejón-Pita, Alfonso A. (2023) Droplet impact dynamics on shallow pools. Journal of Fluid Mechanics, 970 . doi:10.1017/jfm.2023.622 ISSN 0022-1120.
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Official URL: http://dx.doi.org/10.1017/jfm.2023.622
Abstract
When a fast droplet impacts a pool of the same fluid, a thin ejecta sheet that dominates the early-time dynamics emerges within the first few microseconds. Fluid and impact properties are known to affect its evolution; we experimentally reveal that the pool depth is a critical factor too. Whilst ejecta sheets can remain separate and subsequently fold inwards on deeper pools, they instead develop into outward-propagating lamellae on sufficiently shallow pools, undergoing a transition that we delineate by comprehensively varying impact inertia and pool depth. Aided by matching direct numerical simulation results, we find that this transition stems from a confinement effect of the pool base on the impact-induced pressure, which stretches the ejecta sheet to restrict flow into it from the droplet on sufficiently shallow pools. This insight is also applied to elucidate the well-known transition due to Reynolds number.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | |||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | Fluid mechanics, Thin films, Amorphous substances, Complex fluids, Chemical engineering | |||||||||||||||
| Journal or Publication Title: | Journal of Fluid Mechanics | |||||||||||||||
| Publisher: | Cambridge University Press | |||||||||||||||
| ISSN: | 0022-1120 | |||||||||||||||
| Official Date: | 4 September 2023 | |||||||||||||||
| Dates: |
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| Volume: | 970 | |||||||||||||||
| DOI: | 10.1017/jfm.2023.622 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
| Date of first compliant deposit: | 13 September 2023 | |||||||||||||||
| Date of first compliant Open Access: | 14 September 2023 | |||||||||||||||
| RIOXX Funder/Project Grant: |
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