Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.154502
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Funding
- NSF-MRSEC [DMR-0820054]
- NSF [DMR-1105145]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1105145] Funding Source: National Science Foundation
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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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