Exotic states of bouncing and walking droplets

Øistein Wind-Willassen, Jan Moláček, Daniel M. Harris, John W. M. Bush

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We present the results of an integrated experimental and theoretical investigation of droplets bouncing on a vibrating fluid bath. A comprehensive series of experiments provides the most detailed characterisation to date of the system's dependence on fluid properties, droplet size, and vibrational forcing. A number of new bouncing and walking states are reported, including complex periodic and aperiodic motions. Particular attention is given to the first characterisation of the different gaits arising within the walking regime. In addition to complex periodic walkers and limping droplets, we highlight a previously unreported mixed state, in which the droplet switches periodically between two distinct walking modes. Our experiments are complemented by a theoretical study based on our previous developments [J. Molacek and J. W. M. Bush, J. Fluid Mech.727, 582-611 (2013);10.1017/jfm.2013.279J. Molacek and J. W. M. Bush, J. Fluid Mech.727, 612-647 (2013)]10.1017/jfm.2013.280, which provide a basis for rationalising all observed bouncing and walking states.
Original languageEnglish
Article number082002
JournalPhysics of Fluids
Issue number8
Number of pages11
Publication statusPublished - 2013

Bibliographical note

Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Fluids / Volume 25 / Issue 8 and may be found at http://pof.aip.org/resource/1/phfle6/v25/i8/p082002_s1.

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Wind-Willassen, Ø., Moláček, J., Harris, D. M., & Bush, J. W. M. (2013). Exotic states of bouncing and walking droplets. Physics of Fluids, 25(8), [082002]. https://doi.org/10.1063/1.4817612