Viscous infuences on jetting process from an impacted concave free surface

A focused jet is generated from a concave free surface through an impact of a tube. Experimental and numerical studies were conducted to explore the viscous influences. The results show that a strong vorticity sheet is generated along the free surface just after impact, and the liquid bulk is initia...

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Bibliographic Details
Published inarXiv.org
Main Authors Xiang-Gang, Cheng, Xiao-Peng, Chen, Ding, Hang, Chun-Yu, Zhang, Jiao-Jiao Guo, Lai-Bing, Jia
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.03.2022
Subjects
Free surfaces
Liquid surfaces
Surface tension
Vorticity
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Summary:A focused jet is generated from a concave free surface through an impact of a tube. Experimental and numerical studies were conducted to explore the viscous influences. The results show that a strong vorticity sheet is generated along the free surface just after impact, and the liquid bulk is initialized ($t\le$$10^{-4}\(s). After the impact, the liquid surface evolves freely and a jet is ejected (\)t\gg$$10^{-4}$s). Pronounced tangential flow is found, and the material in the jet mainly originates from the viscous penetrating layer below the free surface. According to the above observations, a vorticity mechanism of the free surface evolution is proposed. Further, by combining the viscous and interfacial tension effects, a scaling relation estimating the jetting velocity is derived, which agrees with the numerical and experimental results well. The work will be valuable for viscous droplets preparation.
ISSN:2331-8422