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Formation of a direct Kolmogorov-like cascade of second-sound waves in He II.

Kolmakov, G. V. and Efimov, V. B. and Ganshin, A. N. and McClintock, Peter V. E. and Mezhov-Deglin, L. P. (2006) Formation of a direct Kolmogorov-like cascade of second-sound waves in He II. Physical Review Letters, 97 (15). p. 155301.

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    Based on measurements of nonlinear second-sound resonances in a high-quality resonator, we have observed a steady-state wave energy cascade in He II involving a flux of energy through the spectral range towards high frequencies. We show that the energy balance in the wave system is nonlocal in K space and that the frequency scales of energy pumping and dissipation are widely separated. The wave amplitude distribution follows a power law over a wide range of frequencies. Numerical computations yield results in agreement with the experimental observations. We suggest that second-sound cascades of this kind may be useful for model studies of acoustic turbulence.

    Item Type: Article
    Journal or Publication Title: Physical Review Letters
    Additional Information: First observation of a steady-state wave energy cascade for second sound in a high-Q resonator, opened the way for a major programme on wave turbulence and discovery of inverse cascade. McClintock was PI on the grant, guided the experiments, and wrote most of the paper. RAE_import_type : Journal article RAE_uoa_type : Physics
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 2274
    Deposited By: ep_importer
    Deposited On: 04 Apr 2008 10:09
    Refereed?: Yes
    Published?: Published
    Last Modified: 04 Nov 2015 00:14
    Identification Number:

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