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Water drops bouncing off vertically vibrating textured surfaces

Published online by Cambridge University Press:  13 August 2019

Wei Wang ,
Chen Ji ,
Fangye Lin ,
Jun Zou Open the ORCID record for Jun Zou [Opens in a new window]  and
S. Dorbolo
Wei Wang
Affiliation:
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, PR China
Chen Ji
Affiliation:
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, PR China Institute of Marine Science and Technology, Shandong University, Qingdao 266237, PR China
Fangye Lin
Affiliation:
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, PR China
Jun Zou*
Affiliation:
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, PR China
S. Dorbolo
Affiliation:
GRASP, Physics Department B5, University of Liège, B-4000 Liège, Belgium
*
†Email address for correspondence: junzou@zju.edu.cn
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Abstract

We investigate the conditions that determine the detachment of a water drop from different vibrating textured plates by using vertical vibrations. The plate surfaces were patterned by a lattice of pillars of different shapes with different geometrical arrangements. The acceleration threshold for the water droplet to bounce off the surfaces was measured as a function of the excitation frequency. In each case, the acceleration threshold presents a minimum at the natural frequency of the droplet. The minimum acceleration required for the take-off is larger for small droplets than for large droplets. Namely, one finds that the value of the threshold depends on the size of the droplet and on the maximum apparent contact area between the droplet and the substrate. The theoretical model takes into account the energy necessary to break the capillary bridges between the droplet and the pillars of the surface. This model captures the main ingredients explaining the drop size dependence of the acceleration threshold for the take-off.

JFM classification

Drops and Bubbles: Drops Interfacial Flows (free surface): Liquid bridges Micro-/Nano-fluid dynamics: Microfluidics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 876 , 10 October 2019 , pp. 1041 - 1051
Copyright
© 2019 Cambridge University Press 

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