Journal
JOURNAL OF FLUID MECHANICS
Volume 830, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2017.627
Keywords
capillary flows; contact lines; drops
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [16K14176]
- MAE (French Ministry of Foreign Affairs and International Development)
- JSPS through the PHC Sakura programme 'Wetting dynamics in the presence of particles'
- Fund for Strategic Research Areas from Tokyo University of Science
- Grants-in-Aid for Scientific Research [16K14176] Funding Source: KAKEN
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Wetting of a planar solid substrate is investigated in the presence of a macroscopic particle in the complete wetting regime. A drop of silicone oil spreads on the substrate and its macroscopic edge is incident on the particle at the late stage of spreading. The drop-particle interaction is observed in detail by shadowgraph and interferometry. Although the spreading drop edge is pinned by the particle for a short time, a sharp acceleration occurs when the liquid starts wetting the extra surface area offered by the particle and forming a meniscus. This process yields a net gain in spreading speed. A theoretical model based on the classical wetting dynamics dictated by Cox's law is developed. It predicts that the capillary energy of the meniscus gives rise to a rapid motion of the liquid edge, showing good agreement with the dynamics observed in the experiments.
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