Leaf oscillation and upward ejection of droplets in response to drop impact

Artificial leaves; Drop Impact; Inertial forces; Leaf surfaces; Pathogenics; Plant leaves; Raindrop impact; Simple++; Single drops; Modeling and Simulation; Fluid Flow and Transfer Processes

Abstract :

[en] Plant leaves vibrate in response to raindrop impacts. When the resulting inertial forces are sufficient, residual rainwater at the leaf surface may be dislodged and ejected in the form of droplets. These droplets participate to the transport of pathogenic spores, including in the upward direction. The present experimental work aims at exploring the limits of this mechanism, in the simpler case of a single drop impacting an initially dry artificial leaf. The transfer of momentum from the impacting drop to the leaf is rationalized. The conditions of droplet ejection are identified, and these droplets are shown to inherit from the velocity of the leaf. Finally, these results are extrapolated to estimate the frequency of upward transport events as a function of rainfall intensity for a distribution of raindrop sizes.

Disciplines :

Physics

Author, co-author :

Gilet, Tristan ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Microfluidique

Tadrist, Loïc ; Institut des Sciences du Mouvement, Aix-Marseille Université, Aix-En-Provence, France

Language :

English

Title :

Leaf oscillation and upward ejection of droplets in response to drop impact

Publication date :

May 2025

Journal title :

Physical Review Fluids

ISSN :

2469-9918

eISSN :

2469-990X

Publisher :

American Physical Society

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://link.aps.org/article/10.1103/PhysRevFluids.10.053601

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

Funding text :

This work was supported by the Fonds de la Recherche Scientifique\u2013FNRS through Grant No. J.0071.23.

Available on ORBi :

since 08 July 2025

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