Critical Velocity of a Superflowing Liquid-Helium Film Using Third Sound

1969 ◽  
Vol 178 (1) ◽  
pp. 389-399 ◽  
Author(s):  
K. A. Pickar ◽  
K. R. Atkins
Keyword(s):  
Liquid Helium ◽  
Critical Velocity ◽  
Helium Film ◽  
Third Sound

A Liquid Helium Film Heat Pipe/Heat Switch

1998 ◽  
pp. 1497-1504 ◽  
Author(s):  
M. J. DiPirro ◽  
P. J. Shirron ◽  
D. C. McHugh
Keyword(s):  
Heat Pipe ◽  
Liquid Helium ◽  
Helium Film ◽  
Pipe Heat

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.

Thickness of a Rotating Liquid-Helium Film

1967 ◽  
Vol 19 (21) ◽  
pp. 1224-1227 ◽  
Author(s):  
R. E. Little ◽  
K. R. Atkins
Keyword(s):  
Liquid Helium ◽  
Helium Film ◽  
Rotating Liquid

The thickness of the helium film

1951 ◽  
Vol 205 (1081) ◽  
pp. 270-285 ◽  
Keyword(s):  
Stainless Steel ◽  
Liquid Helium ◽  
Polarized Light ◽  
Angle Of Incidence ◽  
Helium Film ◽  
Helium Ii ◽  
Reflected Light ◽  
Linearly Polarized ◽  
Barium Stearate

A description is given of an optical method for the determination of the thickness of the helium II film. Linearly polarized light is reflected from a stainless steel mirror, the upper part of which is coated with a layer of barium stearate one molecule thick and the lower part with a similar layer three molecules thick. The reflected light passes through a mica compensating plate and a nicol prism. Adjustment of the mica plate and nicol gives equality of illumination on the ‘1’ and ‘3’ areas. If now a film of helium II covers the mirror the nicol must be rotated to restore equality of illumination. The rotation is a measure of the thickness of the helium film, the relation between the two quantities being calculated in terms of the angle of incidence and the optical constants of liquid helium, barium stearate and stainless steel. The observed thickness at any given height above the liquid helium was found to be nearly independent of the temperature between 1⋅1 and 2⋅18° K but then decreased rapidly to zero at the λ -point. In the formula d = k / h 1/ z for the thickness d at height h cm. for any given temperature, the value of z varies from 3⋅5 at 1⋅1° K to 2⋅5 at 2⋅1° K. The thickness at 1 cm. and 1⋅5° K is provisionally given as 1⋅9 x 10 -6 cm.

scholarly journals On the Possibility of a Significant Increase in the Storage Time of Ultracold Neutrons in Traps Coated with a Liquid Helium Film

JETP Letters ◽  
2021 ◽  
Vol 114 (8) ◽  
pp. 493-499
Author(s):  
P. D. Grigoriev ◽  
A. M. Dyugaev ◽  
T. I. Mogilyuk ◽  
A. D. Grigoriev
Keyword(s):  
Liquid Helium ◽  
Storage Time ◽  
Ultracold Neutrons ◽  
Helium Film

Critical Velocity of Superflow in Liquid Helium II

1952 ◽  
Vol 85 (6) ◽  
pp. 1044-1045 ◽  
Author(s):  
H. M. Fried ◽  
P. R. Zilsel
Keyword(s):  
Liquid Helium ◽  
Critical Velocity ◽  
Helium Ii
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