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Acoustic Turbulence in Superfluid 4He.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>09/2009
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number3-6
Number of pages21
Pages (from-to)95-115
<mark>Original language</mark>English


Recent work on nonlinear second sound wave propagation and acoustic turbulence in superfluid 4He is reviewed. Observations of direct and inverse turbulent energy cascades are described. The direct cascade arises due to the huge nonlinear dependence of the second sound wave velocity on its amplitude. The flux of energy injected at the driving frequency is transformed via successively higher harmonics until it is eventually attenuated by viscous dissipation at the short wavelength edge of the spectrum. The onset of the inverse cascade occurs above a critical driving energy density, and it is accompanied by giant waves that constitute an acoustic analogue of the rogue waves that occasionally appear on the surface of the ocean. The theory of the phenomena is outlined and shown to be in good agreement with the experiments.

Bibliographic note

The final publication is available at Springer via http://dx.doi.org/10.1007/s10909-009-9894-y