Hydrodynamic impulse and energy of vortex tangle in superfluid turbulent He-II

• Veröffentlicht in: Физика низких температур
• Datum: 1998
• Hauptverfasser: Nemirovskii, S.K., Lushnikov, V.A.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 1998
• Schlagworte: Специальный выпуск International Workshop on Low Temperature Microgravity Physics
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/176368
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Hydrodynamic impulse and energy of vortex tangle in superfluid turbulent He-II / S. K. Nemirovskii, V. A. Lushnikov // Физика низких температур. — 1998. — Т. 24, № 2. — С. 127-131. — Бібліогр.: 11 назв. — англ.

The average hydrodynamic impulse (or Lamb impulse) Jv in the counterflowing superfluid,
 turbulent He-II and the kinetic energy E, which is associated with the chaotic vortex filaments, are
 calculated. These quantities are defined as averages of the classical quantities taken over the stochastic
 vortex loop distribution The averaging procedure was performed by using the Gaussian model of the
 chaotic vortex tangle elaborated earlier. Calculations show that the quantity Jy has an only a component
 in the direction of external counterflow velocity (created, e.g., by a heater). As for the energy, it is
 shown that besides the usual local contribution, the quantity E includes additional terms due to a
 long-range interaction. Some dynamic properties of the turbulent He-II due to the impulse and energy
 of the vortex configuration, such as suppression of the superfluid density and decrease in the velocity of
 the second sound that propagates in the superfluid turbulent He-II, are discussed.