2016/04/26 by Timothée Jamin, Yacine Djama, Jamin, Timothée +5
Physics and Astronomy · #Classical Physics (physics.class-ph) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #physics.class-ph #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.1604.07686
Physical Review Fluids, American Physical Society, 2016
arxiv created 2016/04/26 · arxiv updated 2016/04/27
We report an experimental study of a magnetic liquid drop deposited on a superhydrophobic substrate and subjected to vertical vibrations in 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 in good agreement with the experiments with no fitting parameter.