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Tuning the resonant frequencies of a drop by a magnetic field

Timothée Jamin, Yacine Djama, Jean-Claude Bacri, and Eric Falcon*

  • Université Paris Diderot, Sorbonne Paris Cité, MSC, CNRS (UMR 7057), 75013 Paris, France

  • *eric.falcon@univ-paris-diderot.fr

Phys. Rev. Fluids 1, 021901(R) – Published 2 June, 2016

DOI: https://doi.org/10.1103/PhysRevFluids.1.021901

Abstract

We report an experimental study of a magnetic liquid drop deposited on a superhydrophobic substrate and subjected to vertical vibrations in the presence of a static magnetic field. It is well known that a flattened drop of usual liquid displays oscillating lobes at its periphery when vibrated. By adding ferromagnetic nanoparticles to a water drop and varying the strength of the magnetic field, we are experimentally able to efficiently tune the resonant frequencies of the drop. By using conservation energy arguments, we show that the magnetic field contribution is equivalent to adding an effective negative surface tension to the drop. Our model is found to be in good agreement with the experiments with no fitting parameter.

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References (46)

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