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.
|Original language||English (US)|
|Journal||Applied Physics Letters|
|State||Published - Oct 25 2021|
Bibliographical noteFunding Information:
This work was supported by the National Science Foundation (NSF) under Grant No. CBET-1919753. This x-ray imagining used resources of the Advanced Photon Source led by Dr. Kamel Fezza and Dr. Tao Sun, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
© 2021 Author(s).