Nonlinear Second Sound Waves and Acoustic Turbulence in Superfluid 4He
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- Efimov, V.B., Ganshin, A.N., McClintock, P.V.E. et al. J Low Temp Phys (2007) 148: 251. doi:10.1007/s10909-007-9386-x
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The preliminary results of an investigation of nonlinear second sound waves in a high quality resonator filled with superfluid 4He are presented and discussed. It is found that, for a sufficiently strong periodic driving force, a cascade of second sound waves is formed at multiple harmonics of the driving frequency over the extremely wide frequency range 1–100 kHz. It can be described by a power law Aω=const.×ω−m, where the scaling index m≈1. These observation can be attributed to the formation of a Kolmogorov-like turbulent cascade in the system of second sound waves, accompanied by directed energy flux through the frequency scales. It manifests itself as a limiting of the amplitude of a standing wave, a distortion of the shape of the initially harmonic waves, and a reduction of the effective quality factor Q of the resonator.