Volume 92, Number 1, October 2010
|Number of page(s)||5|
|Published online||22 October 2010|
Self-organization of ultrasound in viscous fluids
Instituto de Investigación para la Gestión Integrada de las Zonas Costeras, Universidad Politécnica de Valencia C/. Paranimf 1, 46730 Grao de Gandia, Spain, EU
2 Departamento de Sistemas Informáticos y Computación, Universidad Politécnica de Valencia Cno. Vera s/n, 46022 Valencia, Spain, EU
Accepted: 16 September 2010
We report the theoretical and experimental demonstration of pattern formation in acoustics. The system is an acoustic resonator containing a viscous fluid. When the system is driven by an external periodic force, the ultrasonic field inside the cavity experiences different pattern-forming instabilities leading to the emergence of periodic structures. The system is also shown to possess bistable regimes, in which localized states of the ultrasonic field develop. The thermal nonlinearity in the viscous fluid, together with the far-from-equilibrium conditions, are responsible of the observed effects.
PACS: 05.45.-a – Nonlinear dynamics and chaos / 47.54.-r – Pattern selection; pattern formation / 43.25.+y – Nonlinear acoustics
© EPLA, 2010
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