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Lookup NU author(s): Simon Godfrey,
Dr David Samuels,
Professor Carlo Barenghi
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The calculation of the stability characteristics of superfluid helium II is complicated by the fact that we have to consider the interaction of two velocity fields: the normal fluid and the superfluid. We consider 2D channel flow and concentrate on the linear stability of the normal fluid under a mutual friction forcing from the superfluid. The linear stability of the superfluid component is also briefly discussed. We consider nonuniform distributions of superfluid vorticity, leading to a nonuniform mutual friction forcing. We derive a modified Orr-Sommerfeld equation for the stability of the normal fluid component and find the neutral stability curves for the normal fluid. We identify a new branch to the neutral stability curve, which can significantly lower the critical Reynolds number of the normal fluid flow. © 2001 American Institute of Physics.
Author(s): Godfrey SP, Samuels DC, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physics of Fluids
ISSN (print): 1070-6631
ISSN (electronic): 1089-7666
Publisher: American Institute of Physics
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