Rim dynamics and droplet ejections upon drop impact on star-shaped poles

Drop Impact; Droplet ejection; Dynamic ejection; Edge geometry; Edge shape; Liquid sheets; Position size; Solid substrates; Star-shaped; Statistical distribution; Computational Mechanics; Modeling and Simulation; Fluid Flow and Transfer Processes

Abstract :

[en] When a drop impacts next to the edge of a solid substrate, it may spread beyond this edge. It then forms a liquid sheet surrounded by a rim from which droplets may be ejected. This work investigates the influence of the edge shape on the rim dynamics and subsequent droplet ejections. Experiments of drop impacts on star-shaped poles are reported. Both the rim and the ejected droplets are tracked. An analytical model is proposed to rationalize the amplitude of rim deformations induced by the edge shape. Statistical distributions of position, size, and velocity of ejected droplets are also shaped by the edge geometry.

Research Center/Unit :

A&M - Aérospatiale et Mécanique - ULiège

Disciplines :

Physics

Author, co-author :

Bauer, Tobias ; Microfluidics Lab, Department of Aerospace and Mechanical Engineering, University of Liège, Liège, Belgium

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

Language :

English

Title :

Rim dynamics and droplet ejections upon drop impact on star-shaped poles

Publication date :

August 2024

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.9.083602

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique
ULiège - Université de Liège

Funding text :

This work was supported by the Fonds de la Recherche Scientifique - FNRS through the Grant No. J.0071.23. T.B. benefited from an Erasmus grant for a Master's thesis at the University of Li\u00E8ge, in the framework of a master 2 program in Fluid Mechanics at Sorbonne University (Paris, France). The authors acknowledge the workshop of the Department of Aerospace and Mechanical Engineering of the University of Li\u00E8ge for the fabrication of substrates. St\u00E9phane Zaleski and David Qu\u00E9r\u00E9 are thanked for fruitful discussions.

Available on ORBi :

since 08 July 2025

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