منابع مشابه
Dynamics of a Simple Model for Turbulence of the Second Sound in Helium II
The results of numerical experiments on chaotic (’turbulent’) dynamics of the second sound in helium II are presented and discussed based on a very simple model proposed and theoretically studied recently by Khalatnikov and Kroyter. Using a powerful present–day techniques for the studying nonlinear phenomena, we confirm their results on the stationary oscillation in helium and its stability as ...
متن کاملThe two-fluid theory and second sound in liquid helium
© 2009 American Institute of Physics, S-0031-9228-0910-020-0 Early research with liquid helium showed that it had remarkable new properties, especially below the so-called lambda transition near 2.2 K, where there is a sharp, narrow peak in the specific heat (see figure 1a). The liquid below the transition was named helium II to distinguish it from the liquid above the transition, called helium...
متن کاملNonlinear Second Sound Waves in superfluid helium: Instabilities, turbulence and Rogue Waves
Recent work on nonlinear second sound wave propagation and acoustic turbulence in superfluid He is reviewed. Observations of direct and inverse turbulent energy cascades are described. The direct cascade arises due to the strong nonlinear dependence of the second sound wave velocity on its amplitude. The flux of energy injected at the driving frequency is transformed via successively higher har...
متن کاملParametric generation of second sound in superfluid helium: linear stability and nonlinear dynamics
We report the experimental studies of a parametric excitation of a second sound (SS) by a first sound (FS) in a superfluid helium in a resonance cavity. The results on several topics in this system are presented: (i) The linear properties of the instability, namely, the threshold, its temperature and geometrical dependencies, and the spectra of SS just above the onset were measured. They were f...
متن کاملCritical Landau velocity in helium nanodroplets.
The best-known property of superfluid helium is the vanishing viscosity that objects experience while moving through the liquid with speeds below the so-called critical Landau velocity. This critical velocity is generally considered a macroscopic property as it is related to the collective excitations of the helium atoms in the liquid. In the present work we determine to what extent this concep...
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ژورنال
عنوان ژورنال: Physical Review
سال: 1949
ISSN: 0031-899X
DOI: 10.1103/physrev.76.948