Shear flow and Kelvin-Helmholz instability in superfluids

Rob Blaauwgeers; Vladimir Eltsov; Georg Eska; Antti Finne; R.P. Haley; M. Krusius; Jaakko Ruohio; Ladislav Skrbek; G. E. Volovik

doi:10.1103/PhysRevLett.89.155301

Shear flow and Kelvin-Helmholz instability in superfluids

Rob Blaauwgeers, Vladimir Eltsov, Georg Eska, Antti Finne, R.P. Haley, M. Krusius, Jaakko Ruohio, Ladislav Skrbek, G. E. Volovik

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Abstract

The first realization of instabilities in the shear flow between two superfluids is examined. The interface separating the A and B phases of superfluid 3He is magnetically stabilized. With uniform rotation we create a state with discontinuous tangential velocities at the interface, supported by the difference in quantized vorticity in the two phases. This state remains stable and nondissipative to high relative velocities, but finally undergoes an instability when an interfacial mode is excited and some vortices cross the phase boundary. The measured properties of the instability are consistent with the classic Kelvin-Helmholtz theory when modified for two-fluid hydrodynamics.

Original language	English
Article number	155301
Pages (from-to)	1-4
Journal	Physical Review Letters
Volume	89
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.89.155301
Publication status	Published - 2002
MoE publication type	A1 Journal article-refereed

Keywords

superfluid 3He, 4He
shear flow
A and B phase
qoantized vorticity

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10.1103/PhysRevLett.89.155301

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abstract = "The first realization of instabilities in the shear flow between two superfluids is examined. The interface separating the A and B phases of superfluid 3He is magnetically stabilized. With uniform rotation we create a state with discontinuous tangential velocities at the interface, supported by the difference in quantized vorticity in the two phases. This state remains stable and nondissipative to high relative velocities, but finally undergoes an instability when an interfacial mode is excited and some vortices cross the phase boundary. The measured properties of the instability are consistent with the classic Kelvin-Helmholtz theory when modified for two-fluid hydrodynamics.",

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author = "Rob Blaauwgeers and Vladimir Eltsov and Georg Eska and Antti Finne and R.P. Haley and M. Krusius and Jaakko Ruohio and Ladislav Skrbek and Volovik, {G. E.}",

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AU - Blaauwgeers, Rob

AU - Eltsov, Vladimir

AU - Eska, Georg

AU - Finne, Antti

AU - Haley, R.P.

AU - Krusius, M.

AU - Ruohio, Jaakko

AU - Skrbek, Ladislav

AU - Volovik, G. E.

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N2 - The first realization of instabilities in the shear flow between two superfluids is examined. The interface separating the A and B phases of superfluid 3He is magnetically stabilized. With uniform rotation we create a state with discontinuous tangential velocities at the interface, supported by the difference in quantized vorticity in the two phases. This state remains stable and nondissipative to high relative velocities, but finally undergoes an instability when an interfacial mode is excited and some vortices cross the phase boundary. The measured properties of the instability are consistent with the classic Kelvin-Helmholtz theory when modified for two-fluid hydrodynamics.

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KW - superfluid, shear flow, A and B phase, qoantized vorticity

KW - superfluid 3He, 4He

KW - shear flow

KW - A and B phase

KW - qoantized vorticity

U2 - 10.1103/PhysRevLett.89.155301

DO - 10.1103/PhysRevLett.89.155301

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EP - 4

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