Third sound and the superfluid parameters of thin helium films

1970 ◽  
Vol 3 (3) ◽  
pp. 225-234 ◽  
Author(s):  
I. Rudnick ◽  
J. C. Fraser
Keyword(s):  
Helium Films ◽  
Third Sound ◽  
Thin Helium Films

Third sound, two-dimensional hydrodynamics, and elementary excitations in very thin helium films

1978 ◽  
Vol 18 (5) ◽  
pp. 2155-2168 ◽  
Author(s):  
J. E. Rutledge ◽  
W. L. McMillan ◽  
J. M. Mochel ◽  
T. E. Washburn
Keyword(s):  
Two Dimensional ◽  
Helium Films ◽  
Elementary Excitations ◽  
Third Sound ◽  
Thin Helium Films

Variable transfer rates in superfluid helium films

1966 ◽  
Vol 290 (1420) ◽  
pp. 1-13 ◽  
Keyword(s):  
Thick Film ◽  
Superfluid Helium ◽  
Transfer Rate ◽  
Bath Surface ◽  
Helium Films ◽  
Third Sound ◽  
Transfer Rates ◽  
Superfluid Flow ◽  
Helium Bath ◽  
The Difference

From an experimental investigation of superfluid film transfer in narrow beakers in helium II it emerges that there are probably two kinds of film. A ‘normal’ film is formed by superfluid creep over a dry substrate. A ‘thick’ film remains when liquid has drained from a substrate that has previously been immersed in the liquid helium bath. A comparison has been made of the superfluid flow between the two types of film. Scatter of values of transfer rate associated with a normal film is attributed to third sound generated by bath waves impinging on the meniscus at the base of the film. The thick film shows an enhanced rate of transfer which can persist for long periods of time in quiet conditions, but which can be abruptly diminished by disturbances such as bath surface agitation. There is a maximum stable length for a thick film exhibiting the full enhanced rate. The enhanced rate can be as much as 60% greater than the normal rate at 1° K, but the difference between the two rates of transfer disappears above 1.8 °K. No enhanced rate of transfer at any temperature is observed in beakers as large as 8 mm diameter.

Comments on the article: ‘The two-fluid model of the helium film’

1973 ◽  
Vol 333 (1593) ◽  
pp. 261-263 ◽  
Keyword(s):  
Superfluid Helium ◽  
Fluid Model ◽  
Convection Velocity ◽  
Thermodynamic Approach ◽  
Helium Film ◽  
Helium Films ◽  
Third Sound ◽  
Superfluid Flow ◽  
Two Fluid Model ◽  
Two Fluid

It is argued that the thermodynamic approach used by Goodstein and Saffman in their theory of thin superfluid helium films is incorrect. Their theory does not explain Keller’s experiment. The value they obtained for the convection velocity of third sound in a film with superfluid flow is consequently unfounded theoretically. Their calculation of third sound attenuation is shown to be incomplete.

Superfluidity in thin helium films

Nature ◽  
1974 ◽  
Vol 247 (5440) ◽  
pp. 338-339
Author(s):  
Keyword(s):  
Helium Films ◽  
Thin Helium Films

Topical issue on thin helium films

1970 ◽  
Vol 3 (3) ◽  
pp. 197-197 ◽  
Author(s):  
John G. Daunt
Keyword(s):  
Topical Issue ◽  
Helium Films ◽  
Thin Helium Films

The crucial role of the vapour for the speed and attenuation of isothermal third sound in unsaturated helium films

Physica B+C ◽  
1983 ◽  
Vol 115 (3) ◽  
pp. 376-380 ◽  
Author(s):  
G. Bannink ◽  
M.G.M. Brocken ◽  
I. van Andel ◽  
H. van Beelen
Keyword(s):  
Crucial Role ◽  
Helium Films ◽  
Third Sound
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