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Submersion of impacting spheres at low Bond and Weber numbers owing to a confined pool

Published online by Cambridge University Press:  05 December 2019

Han Chen ,
Hao-Ran Liu ,
Peng Gao Open the ORCID record for Peng Gao [Opens in a new window]  and
Hang Ding Open the ORCID record for Hang Ding [Opens in a new window]
Han Chen
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230026, China
Hao-Ran Liu
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230026, China
Peng Gao
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230026, China
Hang Ding*
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230026, China
*
†Email address for correspondence: hding@ustc.edu.cn
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Abstract

We numerically investigate the mechanism resulting in fate change of a hydrophobic sphere impacting onto a confined pool, that is, at the same impact speed, it does not submerge in a wide pool but does in a narrow pool. We find that the reflection of the impact-induced gravity-capillary waves from the pool boundary is responsible for this phenomenon. In particular, the return of the wave to the symmetry axis may coincide with the rising of the impacting sphere to the water surface, which corresponds to the critical conditions of the fate change. Moreover, for the spheres at the onset of submersion in a wide pool, our analysis suggests that this scenario also accounts for an interesting observation in the numerical simulations. That is, the effective pool size $S_{c}$, beyond which the submersion of impacting spheres is no longer affected by the pool size $S$, is mainly dependent on the sphere diameter, no matter whether the surface waves are the capillary or gravity waves. For $S<S_{c}$, two important pool sizes ($S_{w,1}$ and $S_{w,2}$, and $S_{w,2}\geqslant S_{w,1}$) are identified at the same impact speed, and the sphere submersion takes place at $S_{w,1}\leqslant S\leqslant S_{w,2}$. Based on the flow features identified in simulations, a scaling law is proposed to correlate the Weber number and Bond number with $S_{w}$. The theoretical prediction is shown to agree well with the numerical results.

JFM classification

Interfacial Flows (free surface): Contact lines Waves/Free-surface Flows: Capillary waves
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 884 , 10 February 2020 , A13
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Copyright
© 2019 Cambridge University Press

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Chen et al. supplementary movie 1

Dynamics of an impacting sphere at θ=108Ο, λρ=0.855, Bo=3.4, We=13.5 and Re=2200. The sphere ends up with sinking in a small pool (left and S=3.5) while floating at the interface in a large one (right and S=20).

Download Chen et al. supplementary movie 1(Video)
Video 8.6 MB

Chen et al. supplementary movie 2

Dynamics of an impacting sphere at θ=150Ο, λρ=1.2, Bo=0.5, We=23 and Re=1800. The sphere ends up with sinking in a small pool (left and S=3.5) while bouncing from the interface in a large one (right and S=20).

Download Chen et al. supplementary movie 2(Video)
Video 10.2 MB