NDLI: The Frequency Dependence of Critical-Velocity Behavior in the Oscillatory Flow of Superfluid $^{4}$He Through a 2 × 2-μm Aperture in a Thin Foil

Content Provider	Springer Nature Link
Author	Flaten, J. A. Lindensmith, C. A. Zimmermann, W.
Copyright Year	2006
Abstract	The critical-velocity behavior of oscillatory superfluid $^{4}$He flow through a 2 × 2-μm aperture in a 0.1-μm-thick metal foil has been studied from 0.36 to 2.10 K at frequencies from less than 50 Hz up to above 1880 Hz. The pressure remained less than 0.5 bar. In early runs during which the frequency remained below 400 Hz, the critical velocity was a nearly-linearly decreasing function of increasing temperature throughout the region of temperature studied. In runs at the lowest frequencies, isolated 2π phase slips could be observed at the onset of dissipation. In runs with frequencies higher than 400 Hz, downward curvature was observed in the decrease of critical velocity with increasing temperature. In addition, above 500 Hz an alteration in supercritical behavior was seen at the lower temperatures, involving the appearance of large-energy-loss events. These irregular events typically lasted a few tens of half-cycles of oscillation and could involve hundreds of times more energy loss than would have occurred in a single complete 2π phase slip at maximum flow. The temperatures at which this altered behavior was observed rose with frequency, from ~ 0.6 K and below at 500 Hz, to ~ 1.0 K and below at 1880 Hz.
Starting Page	725
Ending Page	752
Page Count	28
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	142
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-06-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Superfluid $^{4}$He aperture flow critical velocity phase slip large-energy-loss events dissipation Magnetism, Magnetic Materials Characterization and Evaluation Materials Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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The Frequency Dependence of Critical-velocity Behavior in Oscillatory Flow of Superfluid Helium-4 Through a 2-micrometer by 2-micrometer Aperture in a Thin Foil

The Interpretation of Phase-Slip and Critical-Velocity Data from the Flow of Superfluid $^{4}$He through a 2 μm by 2 μm Aperture

Simulations of Vortex Evolution and Phase Slip in Oscillatory Potential Flow of the Superfluid Component of $^{4}$He Through an Aperture

Simulations of Vortex Evolution and Phase Slip in Oscillatory Potential Flow of the Superfluid Component of Helium-4 Through an Aperture

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Universal Critical Velocity for the Onset of Turbulence of Oscillatory Superfluid Flow

Hysteresis, Switching and Anomalous Behaviour of a Quartz Tuning Fork in Superfluid $^{4}$He

Transition to Quantum Turbulence Generated by Thin Vibrating Wires in Superfluid $^{4}$He

The Frequency Dependence of Critical-Velocity Behavior in the Oscillatory Flow of Superfluid $^{4}$He Through a 2 × 2-μm Aperture in a Thin Foil

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