Abstract:
The anomalously strong amplitude dependence of the second sound wave velocity allows experimentally studying the behavior of nonlinear waves in a linearly dispersive medium, the processes of energy transformation from single-frequency harmonic pumping into the high-frequency dissipation edge of the spectrum, and the formation and decay dynamics of direct and inverse energy cascades.
Keywords:superfluid helium, acoustic turbulence, turbulence, second sound, nonlinear waves.
PACS:47.27.Cn, 47.37.+q, 67.25.dg, 67.25.dt
Received:July 18, 2017 Revised:March 20, 2018 Accepted: March 28, 2018