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Ultrafast Interference Imaging of Air in Splashing Dynamics

Authors
Type
Preprint
Publication Date
Submission Date
Identifiers
DOI: 10.1103/PhysRevLett.107.154502
Source
arXiv
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Abstract

A drop impacting a solid surface with sufficient velocity will emit many small droplets creating a splash. However, splashing is completely suppressed if the surrounding gas pressure is lowered. The mechanism by which the gas affects splashing remains unknown. We use high-speed interference imaging to measure the air beneath all regions of a spreading viscous drop as well as optical absorption to measure the drop thickness. Although an initial air bubble is created on impact, no significant air layer persists until the time a splash is created. This suggests that splashing in our experimentally accessible range of viscosities is initiated at the edge of the drop as it encroaches into the surrounding gas.

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