title: Formation of a direct Kolmogorov-like cascade of second-sound waves in He II.
abstract: 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.
authors.affiliation: Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom.
authors.forename: G V
authors.initials: GV
authors.lastname: Kolmakov
authors.forename: V B
authors.initials: VB
authors.lastname: Efimov
authors.forename: A N
authors.initials: AN
authors.lastname: Ganshin
authors.forename: P V E
authors.initials: PV
authors.lastname: McClintock
authors.forename: L P
authors.initials: LP
authors.lastname: Mezhov-Deglin