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Sharp acceleration of a macroscopic contact line induced by a particle

Published online by Cambridge University Press:  29 September 2017

Lizhong Mu ,
Daichi Kondo ,
Motochika Inoue ,
Toshihiro Kaneko Open the ORCID record for Toshihiro Kaneko [Opens in a new window] ,
Harunori N. Yoshikawa Open the ORCID record for Harunori N. Yoshikawa [Opens in a new window] ,
Farzam Zoueshtiagh  and
Ichiro Ueno
Lizhong Mu
Affiliation:
Research Institute for Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan Key laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian, 116024, China
Daichi Kondo
Affiliation:
Division of Mechanical Engineering, Graduate School of Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
Motochika Inoue
Affiliation:
Division of Mechanical Engineering, Graduate School of Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
Toshihiro Kaneko
Affiliation:
Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
Harunori N. Yoshikawa*
Affiliation:
Université Côte d’Azur, CNRS, UMR 7351, Laboratoire J.-A. Dieudonné, 06108 Nice Cedex 02, France
Farzam Zoueshtiagh
Affiliation:
Univ. Lille, CNRS, ECLille, ISEN, Univ. Valenciennes, UMR 8520 - IEMN, F-59000 Lille, France
Ichiro Ueno*
Affiliation:
Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
*
†Email addresses for correspondence: [email protected], [email protected]
†Email addresses for correspondence: [email protected], [email protected]
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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.

JFM classification

Interfacial Flows (free surface): Capillary flows Interfacial Flows (free surface): Contact lines Drops and Bubbles: Drops
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 830 , 10 November 2017 , R1
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Copyright
© 2017 Cambridge University Press 

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