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Acoustically levitated dancing drops: Self-excited oscillation to chaotic shedding

Po-Cheng Lin and Lin I
Phys. Rev. E 93, 021101(R) – Published 5 February 2016

Abstract

We experimentally demonstrate self-excited oscillation and shedding of millimeter-sized water drops, acoustically levitated in a single-node standing waves cavity, by decreasing the steady acoustic wave intensity below a threshold. The perturbation of the acoustic field by drop motion is a possible source for providing an effective negative damping for sustaining the growing amplitude of the self-excited motion. Its further interplay with surface tension, drop inertia, gravity and acoustic intensities, select various self-excited modes for different size of drops and acoustic intensity. The large drop exhibits quasiperiodic motion from a vertical mode and a zonal mode with growing coupling, as oscillation amplitudes grow, until falling on the floor. For small drops, chaotic oscillations constituted by several broadened sectorial modes and corresponding zonal modes are self-excited. The growing oscillation amplitude leads to droplet shedding from the edges of highly stretched lobes, where surface tension no longer holds the rapid expanding flow.

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  • Received 13 December 2015

DOI:https://doi.org/10.1103/PhysRevE.93.021101

©2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Nonlinear DynamicsFluid Dynamics

Authors & Affiliations

Po-Cheng Lin and Lin I

  • Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan 32001, Republic of China

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Issue

Vol. 93, Iss. 2 — February 2016

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