Temperature Dependence of the Accommodation Coefficient of Liquid-Helium Film

1973 ◽  
Vol 30 (11) ◽  
pp. 485-487 ◽  
Author(s):  
T. G. Wang ◽  
D. D. Elleman ◽  
E. E. Olli ◽  
M. M. Saffren
Keyword(s):  
Temperature Dependence ◽  
Liquid Helium ◽  
Accommodation Coefficient ◽  
Helium Film

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

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

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.

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