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Experiments in Fluids

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01-07-2021 | Research Article

Behavior of a water droplet impacting a thin water film

Authors: Jiamin Zhu, Ce Tu, Tao Lu, Yan Luo, Kun Zhang, Xue Chen

Published in: Experiments in Fluids | Issue 7/2021

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Abstract

The splash morphology and central jet characteristics of a water droplet impacting a thin water film were investigated for carefully controlled liquid film thicknesses of 120–700 μm using a chromatic confocal displacement sensor. The investigations studied the influences of liquid film thickness, impact velocity and surface characteristics. The coalescence and prompt splash morphologies that included three secondary types were presented in a scatter map based on parameter K and dimensionless film thickness δ. A critical threshold was found between a prompt splash with a delayed splash and a prompt splash without a delayed splash. The results show that the splash morphology is sensitive to the film thickness in this range. The surface characteristics affect the expanding of the crown base by changing the flow drag. Observations of the central jet show that the active central jet breakup depends on the film thickness and the impact velocity.

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previous article Characterization of radiative heating anomaly in high enthalpy shock tunnels

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Title: Behavior of a water droplet impacting a thin water film
Authors: Jiamin Zhu
Ce Tu
Tao Lu
Yan Luo
Kun Zhang
Xue Chen
Publication date: 01-07-2021
Publisher: Springer Berlin Heidelberg
Published in: Experiments in Fluids / Issue 7/2021
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-021-03245-0

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