Experiments on second-sound shock waves in superfluid helium

1978 ◽  
Vol 21 (5) ◽  
pp. 713 ◽  
Author(s):  
John C. Cummings ◽  
Dieter W. Schmidt ◽  
Wolfgang J. Wagner
Keyword(s):  
Shock Waves ◽  
Superfluid Helium ◽  
Second Sound

Schlieren photography of second-sound shock waves in superfluid helium

1984 ◽  
Vol 27 (10) ◽  
pp. 2418 ◽  
Author(s):  
J. R. Torczynski ◽  
D. Gerthsen ◽  
T. Roesgen
Keyword(s):  
Shock Waves ◽  
Superfluid Helium ◽  
Second Sound ◽  
Schlieren Photography

Continuum approach to phonon gas and shape changes of second sound via shock waves theory

1994 ◽  
Vol 16 (1) ◽  
pp. 15-44 ◽  
Author(s):  
T. Ruggeri ◽  
A. Muracchini ◽  
L. Seccia
Keyword(s):  
Shock Waves ◽  
Second Sound ◽  
Continuum Approach ◽  
Shape Changes

Optical method of stimulation of the second sound in superfluid helium

1991 ◽  
Vol 161 (2) ◽  
pp. 161-163 ◽  
Author(s):  
Vadim Petrovich Romanov ◽  
Tagaimurod Khaitovich Salikhov
Keyword(s):  
Superfluid Helium ◽  
Optical Method ◽  
Second Sound ◽  
Stimulation Of

scholarly journals NONLINEAR SECOND SOUND WAVES IN SUPERFLUID HELIUM: INSTABILITIES, TURBULENCE AND ROGUE WAVES

2012 ◽  
Vol 22 (10) ◽  
pp. 1250242
Author(s):  
ANDREY N. GANSHIN ◽  
VICTOR B. EFIMOV ◽  
GERMAN V. KOLMAKOV ◽  
LEONID P. MEZHOV-DEGLIN ◽  
PETER V. E. McCLINTOCK
Keyword(s):  
Sound Wave ◽  
Superfluid Helium ◽  
Turbulent Energy ◽  
Rogue Waves ◽  
Nonlinear Dependence ◽  
Driving Frequency ◽  
Second Sound ◽  
Sound Waves ◽  
Energy Cascades ◽  
Good Agreement

Recent work on nonlinear second sound wave propagation and acoustic turbulence in superfluid 4 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 harmonics until it is eventually attenuated by viscous dissipation at the short-wavelength edge of the spectrum. The onset of the inverse cascade occurs above a critical driving energy density, and it is accompanied by giant waves that constitute an acoustic analogue of the rogue waves that occasionally appear on the surface of the ocean. The theory of the phenomena is outlined and shown to be in good agreement with the experiments.

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