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- Title
Sharp acceleration of a macroscopic contact line induced by a particle.
- Authors
Lizhong Mu; Daichi Kondo; Motochika Inoue; Toshihiro Kaneko; Harunori N. Yoshikawa; Zoueshtiagh, Farzam; Ichiro Ueno
- Abstract
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.
- Subjects
CAPILLARY flow; WETTING; ACCELERATION (Mechanics); MACROSCOPIC films; INTERFEROMETRY
- Publication
Journal of Fluid Mechanics, 2017, Vol 830, pR1-1
- ISSN
0022-1120
- Publication type
Article
- DOI
10.1017/jfm.2017.627