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Drop splashing after impact onto immiscible pools of different viscosities
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Fudge, Ben D., Cimpeanu, Radu, Antkowiak, Arnaud, Castrejón-Pita, J. Rafael and Castrejón-Pita, Alfonso A. (2023) Drop splashing after impact onto immiscible pools of different viscosities. Journal of Colloid and Interface Science, 641 . pp. 585-594. doi:10.1016/j.jcis.2023.03.040 ISSN 0021-9797.
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WRAP-Drop-splashing-after-impact-onto-immiscible-pools-of-different-viscosities-Cimpeanu-2023.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2530Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.jcis.2023.03.040
Abstract
Droplet impact onto liquid pools is a canonical scenario relevant to numerous natural phenomena and industrial processes. However, despite their ubiquity, multi-fluid systems with the drop and pool consisting of different liquids are far less well understood. Our hypothesis is that the post-impact dynamics greatly depends on the pool-to-droplet viscosity ratio , which we explore over a range of six orders of magnitude using a combination of experiments and theoretical approaches (mathematical modelling and direct numerical simulation). Our findings indicate that in this scenario the splashing threshold and the composition of the ejecta sheet are controlled by the viscosity ratio. We uncover that increasing the pool viscosity decreases the splashing threshold for high viscosity pools () when the splash comes from the droplet. By contrast, for low viscosity pools, the splash sheet comes from the pool and increasing the pool viscosity increases the splashing threshold. Surprisingly, there are conditions for which no splashing is observed under the conditions attainable in our laboratory. Furthermore, considering the interface velocity together with asymptotic arguments underlying the generation of the ejecta has allowed us to understand meaningful variations in the pressure during impact and rationalise the observed changes in the splashing threshold.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Drops -- Mathematical models, Drops -- Viscosity, Liquids -- Surfaces, Mechanical engineering | |||||||||||||||
Journal or Publication Title: | Journal of Colloid and Interface Science | |||||||||||||||
Publisher: | Academic Press Inc. Elsivier Science | |||||||||||||||
ISSN: | 0021-9797 | |||||||||||||||
Official Date: | July 2023 | |||||||||||||||
Dates: |
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Volume: | 641 | |||||||||||||||
Page Range: | pp. 585-594 | |||||||||||||||
DOI: | 10.1016/j.jcis.2023.03.040 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
Date of first compliant deposit: | 27 March 2023 | |||||||||||||||
Date of first compliant Open Access: | 27 March 2023 | |||||||||||||||
RIOXX Funder/Project Grant: |
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