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Shear Flow and Kelvin-Helmholtz Instability in Superfluids

Blaauwgeers, R. and Eltsov, V. B. and Eska, G. and Finne, A. P. and Haley, Richard P. and Krusius, M. and Ruohio, J. J. and Skrbek, L. and Volovik, G. E. (2002) Shear Flow and Kelvin-Helmholtz Instability in Superfluids. Physical Review Letters, 89 (15).

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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.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Additional Information: First observation of the Helmholtz instability in a condensate interface, also providing a key technique used in later studies of superfluid turbulence in rotating cryostats. A Helsinki-Lancaster collaboration. Haley was an EU-funded visitor provided essential experimental expertise developed in Lancaster. 28 citations. RAE_import_type : Journal article RAE_uoa_type : Physics
Uncontrolled Keywords: A-PHASE ; B-PHASE ; HE-3 ; TRANSITION ; NUCLEATION ; VORTEX
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 2263
Deposited By: ep_importer
Deposited On: 04 Apr 2008 11:43
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:03
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2263

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