Frequency dependence of sound propagation in superfluid-filled porous media

1994 ◽  
Vol 50 (21) ◽  
pp. 15896-15908 ◽  
Author(s):  
Kevin Warner ◽  
J. R. Beamish
Keyword(s):  
Porous Media ◽  
Frequency Dependence ◽  
Sound Propagation

Theory of sound propagation in porous media allowing for spatial dispersion

2012 ◽  
Vol 131 (4) ◽  
pp. 3292-3292
Author(s):  
Navid Nemati ◽  
Denis Lafarge ◽  
Aroune Duclos
Keyword(s):  
Porous Media ◽  
Spatial Dispersion ◽  
Sound Propagation

scholarly journals Theory of sound propagation in superfluid-filled porous media

2002 ◽  
Vol 300 (6) ◽  
pp. 672-686 ◽  
Author(s):  
T. Buishvili ◽  
Sh. Kekutia ◽  
O. Tkeshelashvili ◽  
L. Tkeshelashvili
Keyword(s):  
Porous Media ◽  
Sound Propagation

Ultrasonic studies of liquid helium in porous media

1987 ◽  
Vol 65 (11) ◽  
pp. 1557-1559 ◽  
Author(s):  
J. R. Beamish ◽  
K. Warner
Keyword(s):  
Porous Media ◽  
Sound Propagation ◽  
Porous Ceramic ◽  
Ultrasonic Waves ◽  
Effective Density ◽  
Biot Theory ◽  
Fluid Density ◽  
Normal Fluid ◽  
Superfluid Fraction ◽  
Viscous Losses

We have studied the propagation of 12 MHz transverse ultrasonic waves in a porous ceramic containing liquid 4He. Both the sound velocity and the attenuation clearly show the superfluid nature of helium. The helium in the pores increases the system's effective density by an amount proportional to the normal-fluid density and so decreases the sound speed. The decoupling of the superfluid fraction below the lambda transition allows us to use the shear wave essentially as a "high-frequency torsional oscillator" to determine the superfluid density and pore tortuosity. The sound attenuation in this system is due to the same mechanism as for fourth sound, namely, viscous losses due to motion of the normal-fluid component. We observed an attenuation proportional to the normal-fluid density and compare this result to predictions of the Biot theory of sound propagation in fluid-filled porous media.

Time‐domain calculations of attenuative and dispersive sound propagation in porous media

2005 ◽  
Vol 118 (3) ◽  
pp. 1866-1866
Author(s):  
D. Keith Wilson ◽  
Vladimir E. Ostashev ◽  
Sandra L. Collier ◽  
David H. Marlin ◽  
David F. Aldridge ◽  
...  
Keyword(s):  
Porous Media ◽  
Time Domain ◽  
Sound Propagation
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