| Popis: |
Our concern is the turbulent flow of Helium II - the quantum phase of liquid Helium. Turbulence in Helium II manifests itself as a disordered system of superfluid vortex lines, called the vortex tangle. The vortex tangle is an interesting state of disorder of matter near absolute zero. It is a form of turbulence which, in principle, is simpler than classical turbulence, because the eddies (the vortex lines) have all the same strength - the circulation around each vortex filament is quantised. But the study of the vortex tangle is also motivated by practical applications of cryogenics engineering: for example liquid Helium is used to cool superconducting magnets in high energy physics and infrared detectors in astrophysics, and the vortex tangle limits liquid Helium’s heat transfer properties in a significant way. |
