Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2011-08-02
Physics
Condensed Matter
Other Condensed Matter
5 figures, 1 table
Scientific paper
The spin up of helium II is studied by calculating the spin-down recovery of a superfluid-filled container after an impulsive acceleration and comparing with experiments. The calculation takes advantage of a recently published analytic solution for the spin up of a Hall-Vinen-Bekharevich-Khalatnikov superfluid that treats the back-reaction torque exerted by the viscous component self-consistently in arbitrary geometry for the first time. Excellent agreement at the 0.5% level is obtained for experiments at $T=1.57\,{\rm K}$, after correcting for the non-uniform rotation in the initial state, confirming that vortex tension and pinning (which are omitted from the theory) play a minimal role under certain conditions (small Rossby number, smooth walls). The dependence of the spin-down time on temperature and the mass fraction of the viscous component are also investigated. Closer to the lambda point, the predicted onset of turbulence invalidates the linear Ekman theory.
Melatos Andrew
van Eysden Cornelis Anthony
No associations
LandOfFree
Spin down of superfluid-filled vessels: theory versus experiment does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin down of superfluid-filled vessels: theory versus experiment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin down of superfluid-filled vessels: theory versus experiment will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-508384