Abstract
We report the results of investigations of acoustic turbulence in a system of nonlinear second sound waves in a high-quality resonator filled with superfluid 4He. It was observed that subharmonics of a periodic driving force applied to the system may be generated via a parametric instability. We find that application of an additional low-frequency pumping to the turbulent system results in the generation of waves at combination frequencies of the driving forces and also leads to substantial changes in the energy spectrum of the acoustic oscillations.
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McClintock, P.V.E., Efimov, V.B., Ganshin, A.N. et al. Turbulence of Second Sound Waves in Superfluid 4He: Effect of Low-Frequency Resonant Perturbations. J Low Temp Phys 150, 394–401 (2008). https://doi.org/10.1007/s10909-007-9563-y
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DOI: https://doi.org/10.1007/s10909-007-9563-y