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Penetration characteristics of a liquid droplet impacting on a narrow gap: Experimental and numerical analysis

Bouchard, DJ, Andredaki, M, Georgoulas, A, Marengo, M and Chandra, S (2022) Penetration characteristics of a liquid droplet impacting on a narrow gap: Experimental and numerical analysis. Physics of Fluids, 34 (5). ISSN 1070-6631

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Experimentalists are limited in the amount of information they can derive from drop impact experiments on porous surfaces because of the short timescales involved and the normally opaque nature of porous materials. Numerical simulations can supplement experiments and provide researchers with previously unattainable information such as velocity and pressure profiles, and quantification of fluid volume flow rates into the pores. Ethanol drops, 2.0 mm in diameter, are impacted on a narrow gap at Weber numbers that match the impact of water drops, also 2.0 mm in diameter, on the same gap size in a previous study. The experiments show the ethanol drops cleaving at all Weber numbers tested, while the water drops completely enter the gap at low Weber numbers and only cleave at higher Weber numbers. A volume of fluid numerical model of the experiments is constructed in OpenFOAM and used to probe the interior of the drops during impact. For the water drop, a high-pressure region fills the drop during impact which continuously drives liquid into the gap. For the ethanol drops, the high-pressure region is smaller and quickly attenuates, which results in a near-zero vertical velocity at the entrance of the gap. Compared to water, the lower surface tension of ethanol causes these drops to spread further upon impact, recoil less, and overall have less liquid over the gap, which promotes cleaving. Against a superficial thought, when the penetration of liquids into porous materials is to be maximized, a higher surface tension liquid is therefore desirable.

Item Type: Article
Additional Information: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids and may be found at https://doi.org/10.1063/5.0091045
Uncontrolled Keywords: 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering; Fluids & Plasmas
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Civil Engineering & Built Environment
Publisher: AIP Publishing
SWORD Depositor: A Symplectic
Date Deposited: 07 Oct 2022 10:55
Last Modified: 07 Oct 2022 11:00
DOI or ID number: 10.1063/5.0091045
URI: https://researchonline.ljmu.ac.uk/id/eprint/17743
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