From antinode clusters to node clusters: The concentration dependent transition of floaters on a standing Faraday wave

ORAL

Abstract

A hydrophilic floating sphere that is denser than water drifts to an amplitude maximum (antinode) of a surface standing wave. A few identical floaters therefore organize into antinode clusters. However, beyond a transitional value of the floater concentration $\phi $, we observe that the same spheres spontaneously accumulate at the nodal lines, completely inverting the self-organized particle pattern on the wave. From a potential energy estimate we show that at low $\phi $ antinode clusters are energetically favorable over nodal ones and how this situation reverses at high $\phi $, in agreement with experiment.

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Authors

  • Ceyda Sanli

    Okinawa Institute of Science and Technology

  • Detlef Lohse

    University of Twente, Physics of Fluids, University of Twente, Enschede, Physics of Fluids, University of Twente, Physics of Fluids group, University of Twente, Netherlands, Universiteit Twente, University of Twente, Physics of Fluids Group, University of Twente, Enschede, The Netherlands, Physics of Fluids Group, Faculty of Science and Technology, J.M. Burgers Center for Fluid Dynamics, and IMPACT Institute, University of Twente, NL, Physics of Fluids Group, University of Twente, The Netherlands

  • Devaraj van der Meer

    Physics of Fluids, University of Twente