Attenuation and Dispersion of First Sound Near the Superfluid Transition of Liquid Helium

1975 ◽  
pp. 1-2
Author(s):  
F. Pobell
Keyword(s):  
Liquid Helium ◽  
Superfluid Transition ◽  
First Sound ◽  
Attenuation And Dispersion

scholarly journals Non-equilibrium Thermodynamical Description of Superfluid Transition in Liquid Helium

2017 ◽  
Vol 42 (4) ◽  
Author(s):  
Lucia Ardizzone ◽  
Maria Stella Mongiovì ◽  
Lidia Saluto
Keyword(s):  
Liquid Helium ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Superfluid Transition ◽  
Non Equilibrium

AbstractIn previous papers a phase field model for

FIRST SOUND IN LIQUID HELIUM AT HIGH PRESSURES

1953 ◽  
Vol 31 (7) ◽  
pp. 1156-1164 ◽  
Author(s):  
K. R. Atkins ◽  
R. A. Stasior
Keyword(s):  
Specific Heat ◽  
Liquid Helium ◽  
Carrier Frequency ◽  
High Pressures ◽  
Constant Pressure ◽  
Constant Density ◽  
Pulse Technique ◽  
Temperature Range ◽  
Specific Heats ◽  
First Sound

The velocity of ordinary sound in liquid helium has been measured in the temperature range from 1.2 °K. to 4.2 °K. at pressures up to 69 atm. A pulse technique was used with a carrier frequency of 12 Mc.p.s. Curves are given for the variation of velocity with temperature at constant pressure and also at constant density. There is no detectable discontinuity along the λ-curve. The results are used to discuss the ratio of the specific heats, the coefficient of expansion below 0.6 °K., and the specific heat above 3 °K.

Attenuation of First Sound Near the Lambda Transition of Liquid Helium

1970 ◽  
Vol 25 (5) ◽  
pp. 276-280 ◽  
Author(s):  
R. D. Williams ◽  
I. Rudnick
Keyword(s):  
Liquid Helium ◽  
First Sound ◽  
Lambda Transition

Dispersion of First Sound in Liquid Helium near theλTransition

1973 ◽  
Vol 31 (5) ◽  
pp. 283-286 ◽  
Author(s):  
W. C. Thomlinson ◽  
F. Pobell
Keyword(s):  
Liquid Helium ◽  
First Sound
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