Propagation of short, nonlinear, second-sound pulses through He-II in one- and three-dimensional geometry

• Published in: Физика низких температур
• Date: 1998
• Main Authors: Efimov, V.B., Kolmakov, G.V., Kuliev, A.S., Mezhov-Deglin, L.P.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 1998
• Subjects: Специальный выпуск International Workshop on Low Temperature Microgravity Physics
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/176366
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Propagation of short, nonlinear, second-sound pulses through He-II in one- and three-dimensional geometry / V.B. Efimov, G.V. Kolmakov, A.S. Kuliev, L.P. Mezhov-Deglin // Физика низких температур. — 1998. — Т. 24, № 2. — С. 116-121. — Бібліогр.: 10 назв. — англ.

The results or an experimental study ot the evolution ot the shape ot nonlinear second-sound pulses in superfluid He-II are reported The pulses propagate in the bulk (3D geometry) and along a cryoacoustic waveguide tilled with liquid helium (quasi-ID geometry) at temperatures corresponding to the negative, positive, or zero nonlinearity coefficient. A strong dependence of the shape of the propagating pulse on the dimensionality of the wave was observed. The finite size of the heater (generator ot a sound) affects the profile ot a short 3D pulse even at distances many times greater than the heater size, which restricts the minimal width of the excited pulse. The experimental data are compared with the results of numerical simulations.