Extrinsic Dissipation Mechanism in Flow of Superfluid Helium
- 10 July 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 29 (2) , 96-99
- https://doi.org/10.1103/physrevlett.29.96
Abstract
Dust particles on the wall of a superfluid flow channel provide sites for generation of quantized vorticity at a low critical velocity. The mechanism is thermal nucleation of vortices in a region of large local velocity near the contact between the particle and the wall. The resulting critical velocity is only weakly temperature dependent, or possibly temperature independent, and is consistent in magnitude with experimental critical velocities for a variety of channel sizes and shapes.Keywords
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