Normal Fluid Density of LiquidHe3-B

1979 ◽  
Vol 43 (2) ◽  
pp. 139-143 ◽  
Author(s):  
C. N. Archie ◽  
T. A. Alvesalo ◽  
J. D. Reppy ◽  
R. C. Richardson
Keyword(s):  
Fluid Density ◽  
Normal Fluid

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.

Normal fluid density of superfluid 3He-B

Nature ◽  
1979 ◽  
Vol 281 (5728) ◽  
pp. 179-180
Author(s):  
P.V.E. McClintock
Keyword(s):  
Superfluid 3He ◽  
Fluid Density ◽  
Normal Fluid

scholarly journals On the Effective Normal Fluid Density tf Solution of He3in He4

1957 ◽  
Vol 17 (1) ◽  
pp. 126-128
Author(s):  
S. K. Trikha ◽  
V. S. Nanda
Keyword(s):  
Fluid Density ◽  
Normal Fluid

Superfluid and normal-fluid density in the cuprate superconductors

2001 ◽  
Vol 249 (1) ◽  
pp. 175-184
Author(s):  
D. B. Tanner ◽  
F. Gao ◽  
K. Kamaras ◽  
H. L. Liu ◽  
M. A. Quijada ◽  
...  
Keyword(s):  
Cuprate Superconductors ◽  
Fluid Density ◽  
Normal Fluid

Observation of the Mechanical Response of the Condensate in He-Bin the Regime of Negligible Normal Fluid Density

1983 ◽  
Vol 51 (7) ◽  
pp. 589-592 ◽  
Author(s):  
A. M. Guénault ◽  
V. Keith ◽  
C. J. Kennedy ◽  
G. R. Pickett
Keyword(s):  
Mechanical Response ◽  
Fluid Density ◽  
Normal Fluid
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