Abstract
A central question in the dynamics of vortex lines in superfluids is dissipation on approaching the zero temperature limit . From both NMR measurements and vortex filament calculations, we find that vortex flow remains laminar up to large Reynolds numbers in a cylinder filled with . This is different from viscous fluids and superfluid , where the corresponding responses are turbulent. In , laminar vortex flow is possible in the bulk volume even in the presence of sizable perturbations from axial symmetry to below . The laminar flow displays no excess dissipation beyond mutual friction, which vanishes in the limit, in contrast with turbulent vortex motion where dissipation has been earlier measured to approach a large -independent value at .
- Received 3 May 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.125301
© 2010 The American Physical Society