SEMINARIO - VORTEX RINGS LIFETIME ENHANCED BY FRICTION INTERACTION IN SUPERFLUID HELIUM - Dr. Luca Galantucci
Giovedì, 25 Febbraio, 2021
In ordinary systems, friction forces slow down the speed of structures and reduce their lifetime. This is not necessarily the case in superfluid helium. Using a new fully-coupled theoretical description of the mutual friction interaction between superfluid and normal fluid components, here we explain why a bundle of vortex rings moving in superfluid helium at finite temperature travels at constant speed a significant distance, as observed in the laboratory, and in contrast to predictions of previous models describing a quick decay of the vortex bundle.