Turbulence of second sound waves in superfluid He II

• Published in: Физика низких температур
• Date: 2004
• Main Authors: Brazhnikov, M.Yu., Efimov, V.B., Kolmakov, G.V., Levchenko, A.A., Lebedeva, E.V., Mezhov-Deglin, L.P.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2004
• Subjects: Квантовые жидкости и квантовые кpисталлы
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/119732
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Turbulence of second sound waves in superfluid He II / M.Yu. Brazhnikov, V.B. Efimov, G.V. Kolmakov, A.A. Levchenko, E.V. Lebedeva, and L.P. Mezhov-Deglin // Физика низких температур. — 2004. — Т. 30, № 6. — С. 560-595. — Бібліогр.: 24 назв. — англ.

We communicate the results of numerical studies of acoustic turbulence in a system of slightly
 dissipating, nonlinear second sound waves in superfluid He II. It is shown that at sufficiently high
 amplitude of the external driving force the power-like energy distribution over frequency is formed
 in the system of second sound waves. This distribution is attributed to formation of the acoustic
 turbulence regime in the system. The interval of frequencies in which the distribution has a
 power-like form is expanded to high frequencies with increasing the amplitude of the driving
 force. The distribution of the energy inside this interval is close to Eω~ 2. It is shown that the
 distribution of energy Eω depends on the value of the nonlinearity coefficient of the second sound,
 but does not depend on the sign of the coefficient, i.e., the coherent structures (shock waves) do
 not contribute to the statistical properties of the turbulent state.