Abstract
We investigate the dynamics of a drop containing a single solid particle impacting on a solid surface. The particle rebounds through the drop during impact and can separate from the deposited liquid above an impact velocity threshold. We show that this threshold can be predicted by a simple energy balance. Moreover, we discover a new type of liquid jetting ejected above the particle faster than the impact velocity. We demonstrate that this jetting is due to the focusing effect of the liquid on the solid substrate below the rebounding particle. Although the wetting properties of the particle have a minor effect on the separation threshold, they play a key role in the liquid jetting by affecting the immersion depth of the particle at the time of impact.
Highlights
In this letter, we propose to investigate the fundamental problem of the particle separation from the impacting drop by placing a single particle on the surface of the impacting drop
The wetting properties of the particle have a minor effect on the separation threshold, they play a key role in the liquid jetting by affecting the immersion depth of the particle at the time of impact
We propose to investigate the fundamental problem of the particle separation from the impacting drop by placing a single particle on the surface of the impacting drop
Summary
ARTICLES YOU MAY BE INTERESTED IN Impact of an air-in-liquid compound drop onto a liquid surface Physics of Fluids 32, 041705 (2020); https://doi.org/10.1063/5.0005702 Splashing dynamics of a drop impact onto a deep liquid pool with moving film interface Physics of Fluids 32, 012102 (2020); https://doi.org/10.1063/1.5131637 Spreading and penetration of a micro-sized water droplet impacting onto oil layers Physics of Fluids 32, 012003 (2020); https://doi.org/10.1063/1.5136033
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