Formation of a Direct Kolmogorov-like Cascade of Second Sound Waves in He II

Details Formation of a Direct Kolmogorov-like Cascade of Second Sound Waves in He II Formation of a Direct Kolmogorov-like Cascade of Second Sound Waves in He II

2009-01-31

arxiv.org/abs/0902.0029v1

Physical Review Letters 97, 155301 (2006)

Physics

Fluid Dynamics

4 pages, 3 figures. The final version just prior to publication

Scientific paper

10.1103/PhysRevLett.97.155301

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.

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