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RESEARCH PRODUCT
Attenuation of the fourth sound in liquid helium II via extended thermodynamics
R.a. PeruzzaMaria Stella Mongiovìsubject
PhysicsLiquid heliumApplied MathematicsMechanical EngineeringAttenuationNon-equilibrium thermodynamicsThermodynamicslaw.inventionSuperfluidityEntropy (classical thermodynamics)Mechanics of MaterialslawAttenuation coefficientSecond soundPorous mediumdescription
Abstract This work continues a study begun in previous works, where a non-standard model of liquid helium II is proposed, in which a small entropy transfer is associated with the superfluid component. In this work the influence of this superfluid entropy on the propagation of the fourth sound is analyzed. From experimental data for velocities and attenuations of the first and second sound, the model provides speed and attenuation coefficient of the fourth sound in a porous medium as a function of the ratio ss/s between the superfluid entropy ss and the total entropy s. These values are determined in the two limiting cases ss/s=0 and =0.02, for various values of temperature and pressure.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-08-01 | International Journal of Non-Linear Mechanics |