Spin-up problem in superfluid He4

P. W. Adams, Rutgers University–New Brunswick
M. Cieplak, Rutgers University–New Brunswick
W. I. Glaberson, Rutgers University–New Brunswick


We report the results of an experimental investigation of the nature of the vortex-boundary interaction and its role in the spin-up problem of superfluid He4. We find evidence for two independence vortex-drag mechanismsa drag associated with vortex lines pulling against pinning sites with a force equal to the line tension and a viscous drag associated with vortex motion through the normal-fluid Ekman layers. © 1985 The American Physical Society.