Observation of self-excited acoustic vortices in defect-mediated dust acoustic wave turbulence

Ya-Yi Tsai and Lin I
Phys. Rev. E 90, 013106 – Published 28 July 2014
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Abstract

Using the self-excited dust acoustic wave as a platform, we demonstrate experimental observation of self-excited fluctuating acoustic vortex pairs with ±1 topological charges through spontaneous waveform undulation in defect-mediated turbulence for three-dimensional traveling nonlinear longitudinal waves. The acoustic vortex pair has helical waveforms with opposite chirality around the low-density hole filament pair in xyt space (the xy plane is the plane normal to the wave propagation direction). It is generated through ruptures of sequential crest surfaces and reconnections with their trailing ruptured crest surfaces. The initial rupture is originated from the amplitude reduction induced by the formation of the kinked wave crest strip with strong stretching through the undulation instability. Increasing rupture causes the separation of the acoustic vortex pair after generation. A similar reverse process is followed for the acoustic vortex annihilating with the opposite-charged acoustic vortex from the same or another pair generation.

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  • Received 6 December 2013

DOI:https://doi.org/10.1103/PhysRevE.90.013106

©2014 American Physical Society

Authors & Affiliations

Ya-Yi Tsai 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. 90, Iss. 1 — July 2014

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