Search results for "Turbulent superfluid helium"

showing 4 items of 4 documents

HEAT FLUX IN SUPERFLUID TRANSITION AND IN TURBULENT HELIUM COUNTERFLOW

Normal fluid profileRadial flow Vortex diffusionTwo-fluid modelHelium 4Ballistic regimeInhomogeneous vortex tangles.lambda TransitionHeat transferQuantized vorticeEffective thermal conductivityTurbulent superfluid helium ( He II)One-fluid modelExtended Irreversible ThermodynamicEntrance regionSettore MAT/07 - Fisica MatematicaLongitudinal flow
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Longitudinal counterflow in turbulent liquid helium: velocity profile of the normal component

2013

In this paper, the velocity profile of the normal component in the stationary flow of turbulent superfluid helium inside a cylindrical channel is determined, making use of a one-fluid model with internal variables derived from Extended Thermodynamics. In the hypothesis of null barycentric velocity of the fluid (the so-called counterflow situation) it is seen that, in the presence of a sufficiently high vortex length density, the velocity profile of the normal component becomes very flat in the central region of the channel. Thus, a central flat profile of the normal fluid does not necessarily imply that the flow of the normal component is turbulent.

PhysicsTurbulenceChézy formulaLiquid heliumApplied MathematicsGeneral MathematicsFlow (psychology)Normal componentGeneral Physics and AstronomyMechanicsNull (physics)Vortexlaw.inventionPhysics::Fluid DynamicsClassical mechanicslawTurbulent superfluid helium. Normal fluid profile. One-fluid model. Quantized vortices. Heat transfer.Settore MAT/07 - Fisica MatematicaSuperfluid helium-4Zeitschrift für angewandte Mathematik und Physik
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Stationary heat flux profile in turbulent helium II in a semi-infinite cylindrical channel

2012

In this paper we determine a set of solutions for a system of partial dif- ferential equations describing stationary heat flux in a semi-infinite cylindrical channel filled with turbulent superfluid helium. This study uses a continuous model for liquid helium II, derived from Extended Thermodynamics, in which the heat flux q is a fundamental variable. The influence of the vortex line den- sity on the radial distribution of the heat flux is especially discussed.

Turbulent superfluid helium heat transfer partial dif- ferential equations Bessel functionsSettore MAT/07 - Fisica Matematica
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Propagation of plane and cylindrical waves in turbulent superfluid helium

2014

In this paper, the equations that govern the propagation of plane and cylindrical waves in turbulent superfluid solutions in some simplified cases are determined.

Wave propagation Partial differential equations Turbulent superfluid helium.
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