Corona splashing triggered by a loose monolayer of particles

In nature, high-speed raindrops often impact and spread on particulate surfaces (e.g., soil, plant leaves with spores or pollen). We study the dynamics of droplet impact on a loosely packed monolayer of particles by combining experimental and mathematical approaches. We find that the presence of mob...

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Bibliographic Details
Published in:Applied physics letters 2021-10, Vol.119 (17)
Main Authors: Esmaili, Ehsan, Chen, Zih-Yin, Pandey, Anupam, Kim, Seungho, Lee, Sungyon, Jung, Sunghwan
Format: Article
Language:English
Subjects:
Applied physics
Droplets
Impact velocity
Jamming
Monolayers
Raindrops
Soil dynamics
Soil erosion
Splashing
Spores
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Summary:In nature, high-speed raindrops often impact and spread on particulate surfaces (e.g., soil, plant leaves with spores or pollen). We study the dynamics of droplet impact on a loosely packed monolayer of particles by combining experimental and mathematical approaches. We find that the presence of mobile particles lowers the critical impact velocity at which the droplet exhibits corona splashing, as the particle area fraction is systematically increased. We rationalize this experimental observation by considering the jamming of frictional particles at the spreading rim. Elucidating the splashing transition of the drop on a particulate bed can lead to a better understanding of soil loss and erosion from falling raindrops.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0059466