NDLI: Measurements of Turbulence Onset and Dissipation in Superfluid Helium with a Silicon Double Paddle Oscillator

Content Provider	Springer Nature Link
Author	Zemma, E. Luzuriaga, J.
Copyright Year	2011
Abstract	We have studied experimentally the response of a silicon single crystal double paddle oscillator submerged in superfluid helium from the lambda point to 1.55 K. Measuring the resonance frequency and dissipation on three modes of this high Q system allows us to study the dissipation at the onset of turbulence in the flow around the paddle. The critical velocity V $_{ c }$ for turbulence onset decreases with temperature. If we use the density of the normal component of the superfluid to obtain a Reynolds number Re associated with V $_{ c }$ we find a value which is largely temperature independent. This result is different from the behavior previously found by other authors below 1 K, where the quantized vorticity (extrinsic nucleation) is observed at velocities more than an order of magnitude greater. In our temperature range, we conclude that the transition is governed by the normal fraction acting as a classical fluid. The laminar regime shows a dissipation that is proportional to the viscous drag calculated by well known formulas for an object oscillating in a liquid. We also find a decrease in resonance frequency in the turbulent regime which is clearly observed but hard to reproduce from run to run.
Starting Page	171
Ending Page	181
Page Count	11
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	166
Issue Number	3-4
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2011-12-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quantum fluids Quantum turbulence Superfluid helium Vibrating paddle Critical velocity Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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