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Directional motion of vibrated sessile drops: a quantitative study

Author(s)
Costalonga, Maxime; Brunet, Philippe
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
The directional motion of sessile drops can be induced by slanted mechanical vibrations of the substrate, which induce drop deformations combining both axisymmetric and antisymmetric modes. In this paper, we establish quantitative trends from experiments conducted within a large range of parameters, namely, the amplitude A and frequency f of the forcing, the liquid viscosity η, and the angle between the substrate and the forcing axis α. These experiments are carried out on weak-pinning substrates. For most parameters sets, the averaged velocity ⟨v⟩ grows linearly with A. We extract the mobility, defined as s=Δ⟨v⟩/ΔA. It is found that s can show a sharp maximal value close to the resonance frequency of the first axisymmetric mode f[subscript p]. The value of s tends to be almost independent on η below 50 cSt, while s decreases significantly for higher η. Also, it is found that for peculiar sets of parameters, particularly with f far enough from f[subscript p], the drop moves in the reverse direction. Finally, we draw a relationship between ⟨v⟩ and the averaged values of the dynamical contact angles at both sides of the drop over one period of oscillation.
Date issued
2020-02
URI
https://hdl.handle.net/1721.1/125738
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Physical Review Fluids
Publisher
American Physical Society
Citation
Costalonga, Maxime, and Philippe Brunet, "Directional motion of vibrated sessile drops: a quantitative study." Physical Review Fluids 5, 2 (Feb. 2020): no. 023601 doi 10.1103/PhysRevFluids.5.023601 ©2020 Author(s)
Version: Final published version
ISSN
2469-990X

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