SURFACE DEFORMATION AND SURFACE MOTION DUE TO STANDING SECOND SOUND WAVES IN HELIUM I I

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-316-C6-317
Author(s):  
S. G. Eckstein ◽  
Y. Eckstein ◽  
J. L. Olsen ◽  
H. Sigg
Keyword(s):  
Surface Deformation ◽  
Second Sound ◽  
Sound Waves ◽  
Surface Motion

scholarly journals Lung surface deformation prediction from spirometry measurement and chest wall surface motion

2016 ◽  
Vol 43 (10) ◽  
pp. 5493-5502 ◽  
Author(s):  
Joubin Nasehi Tehrani ◽  
Alistair McEwan ◽  
Jing Wang
Keyword(s):  
Chest Wall ◽  
Surface Deformation ◽  
Wall Surface ◽  
Deformation Prediction ◽  
Surface Motion

scholarly journals Specificity of the second sound standing waves behavior in a medium with nanoparticles

2021 ◽  
Vol 2056 (1) ◽  
pp. 012040
Author(s):  
A A Esina ◽  
V B Efimov
Keyword(s):  
Normal Component ◽  
Experimental Studies ◽  
Standing Waves ◽  
Second Sound ◽  
Sound Waves ◽  
Two Component System ◽  
Component System ◽  
Two Component ◽  
Significant Attenuation ◽  
Waves Propagation

Abstract The experimental studies of the second sound waves propagation in a resonator with a deuterium-helium gel were carried out. The latest experimental results, combined with those obtained in earlier experiments, have shown that the propagation of the second sound waves in gels leads to their significant attenuation and a decrease in the propagation velocity. This behavior differs from the case of the propagation of the sound waves of a two-component system with a strongly slow normal component and may indicate changes in the properties of superfluidity under confined geometry conditions.

Non-planar and Non-linear Second Sound Waves in He II

2000 ◽  
Vol 17 (1) ◽  
pp. 43-45 ◽  
Author(s):  
Peng Zhang ◽  
Seiji Kimura ◽  
Masahide Murakami ◽  
Ru-zhu Wang
Keyword(s):  
Second Sound ◽  
Sound Waves ◽  
Non Linear

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.

scholarly journals Arrival times for dissipative, nonlinear second-sound waves in solids

1995 ◽  
Vol 52 (1) ◽  
pp. 24-26 ◽  
Author(s):  
G. M. Tarkenton ◽  
M. S. Cramer
Keyword(s):  
Second Sound ◽  
Sound Waves ◽  
Arrival Times
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