Search results for " Second sound"

showing 2 items of 2 documents

Second sound propagation in laminar and turbulent superfluid 4He via extended thermodynamics

2012

In this work, previous results on the complex propagation of second sound in laminar and turbulent superfluid 4He are reported. Furthermore the case of inhomogeneous superfluid turbulence is examined and, in particular, the wave propagation is investigated in the presence of an anisotropic vortex tangle. Two cases of physical interest are considered: wave front collinear and orthogonal to the heat flux.

Settore MAT/05 - Analisi MatematicaSettore MAT/07 - Fisica MatematicaSuperfluid turbulence second sound perturbation method
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Wave propagation in anisotropic turbulent superfluids

2013

In this work, a hydrodynamical model of Superfluid Turbulence previously formulated is applied to study how the presence of a non-isotropic turbulent vortex tangle modifies the propagation of waves. Two cases are considered: wave front parallel and orthogonal to the heat flux. Using a perturbation method, the first-order corrections due to the presence of the vortex tangle to the speeds and to the amplitudes of the first and second sound are determined. It is seen that the presence of the quantized vortices couples first and second sound, and the attenuation of second sound is proportional to the line density L if the wave propagates orthogonal to the heat flux, while it is proportional to …

WavefrontPhysicsAnisotropic superfluid turbulence Quantized vortices Wave propagation Second sound Perturbation method.TurbulenceWave propagationApplied MathematicsGeneral MathematicsAttenuationGeneral Physics and AstronomyMechanicsSuperfluidityAmplitudeClassical mechanicsHeat fluxSecond soundSettore MAT/07 - Fisica Matematica
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