New flow dissipation mechanisms in superfluid He-3

Citation
Rw. Simmonds et al., New flow dissipation mechanisms in superfluid He-3, PHYS REV L, 84(26), 2000, pp. 6062-6065
Citations number
31
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
26
Year of publication
2000
Pages
6062 - 6065
Database
ISI
SICI code
0031-9007(20000626)84:26<6062:NFDMIS>2.0.ZU;2-I
Abstract
We have studied the flow of superfluid He-3-B forced through small aperture s. There are unexpectedly large dissipative currents, which can be describe d by two independent processes. One process involves the creation of quasip articles within the aperture and their subsequent acceleration in the ambie nt pressure gradient. The second process involves the dissipative precessio n of a texture in a geometry-induced anisotropic order parameter. For both mechanisms we make a simple estimate of the relevant effect and find these agree well with the data.