Sound conversion phenomena at the free surface of liquid helium. II. Experimental determination of acoustic coefficients and surface absorption coefficients

1983 ◽  
Vol 51 (3-4) ◽  
pp. 291-318 ◽  
Author(s):  
H. Wiechert ◽  
F. I. Buchholz
Keyword(s):  
Free Surface ◽  
Experimental Determination ◽  
Liquid Helium ◽  
Absorption Coefficients ◽  
Surface Absorption ◽  
Helium Ii

OBSERVATION OF THE FREE SURFACE OF LIQUID HELIUM II IN ROTATION

1963 ◽  
Vol 41 (5) ◽  
pp. 820-823 ◽  
Author(s):  
R. R. Turkington ◽  
J. B. Brown ◽  
D. V. Osborne
Keyword(s):  
Free Surface ◽  
Liquid Helium ◽  
Helium Ii

Experimental Determination of the Fourth Sound Velocity in Helium II

1965 ◽  
Vol 137 (5A) ◽  
pp. A1383-A1391 ◽  
Author(s):  
Kenneth A. Shapiro ◽  
Isadore Rudnick
Keyword(s):  
Experimental Determination ◽  
Sound Velocity ◽  
Helium Ii ◽  
Fourth Sound

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.

Determination of the bulk and surface absorption coefficients of highly transparent solids in the wavelength range of CO2laser radiation

1980 ◽  
Vol 10 (6) ◽  
pp. 772-774
Author(s):  
Evgenii M Dianov ◽  
A I Mitichkin ◽  
A N Panova ◽  
V G Plotnichenko ◽  
V K Sysoev ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Absorption Coefficients ◽  
Surface Absorption

Experimental determination of the pressure on a disk entering a compressible fluid at an angle to the free surface

1988 ◽  
Vol 23 (2) ◽  
pp. 174-178 ◽  
Author(s):  
V. A. Eroshin ◽  
G. A. Konstantinov ◽  
N. I. Romanenkov ◽  
Yu. L. Yakimov
Keyword(s):  
Free Surface ◽  
Experimental Determination ◽  
Compressible Fluid

A simple measuring set-up for the experimental determination of the dynamics of a large particle in the 3D velocity field around a free surface vortex

2019 ◽  
Vol 65 ◽  
pp. 52-64 ◽  
Author(s):  
Simon P.A. Duinmeijer ◽  
Antonio M. Moreno-Rodenas ◽  
Mathieu Lepot ◽  
Christian van Nieuwenhuizen ◽  
Irene Meyer ◽  
...  
Keyword(s):  
Free Surface ◽  
Velocity Field ◽  
Experimental Determination ◽  
Large Particle ◽  
Free Surface Vortex ◽  
Set Up ◽  
Simple Measuring ◽  
Surface Vortex
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