Self-similar jet evolution after drop impact on a liquid surface

Journal article (2021)

Authors

Cees J.M. Van Rijn Universiteit van Amsterdam
J. Westerweel Fluid Mechanics - Mechanical, Maritime and Materials Engineering
Arnaud Antkowiak Sorbonne Université, Paris
Daniel Bonn Universiteit van Amsterdam
Research Group
Fluid Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2021 Cees J.M. Van Rijn, J. Westerweel, Bodjie Van Brummen, Arnaud Antkowiak, Daniel Bonn
DOI: https://doi.org/10.1103/PhysRevFluids.6.034801
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Published Date

2021

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Fluid Mechanics

Abstract

Small conical-shaped jets may emanate from a liquid bath a short while after a small drop has hit a liquid pool. Here we perform Particle Image Velocimetry (PIV) measurements of the liquid flow inside upward jets after drop impact and show that fluid elements inside the jets may decelerate up to 5-20 times the gravitational acceleration. The measurements show that both the shape of the jet and the velocity profile are self-similar. A theoretical model including surface tension, fluid inertia and gravity correctly predicts the self-similar velocity profile and shape of the jet, allowing us to provide the first quantitative explanation of the shape and dynamics of the emanating jets.