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Turbulent drag on a low-frequency vibrating grid in superfluid 4He at very low temperatures

D. I. Bradley, S. N. Fisher, A. M. Guénault, R. P. Haley, Mukesh Kumar, C. R. Lawson, Roch Schanen, P. V. E. McClintock, Lydia Munday, G. R. Pickett, Malcolm Poole, V. Tsepelin, and Paul Williams
Phys. Rev. B 85, 224533 – Published 28 June 2012
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Abstract

We present measurements of the dissipative turbulent drag on a vibrating grid in superfluid 4He over a wide range of (low) frequencies. At high velocities, the dissipative drag is independent of frequency and is approximately the same as that measured in normal liquid 4He. We present measurements on a similar grid in superfluid 3He-B at low temperatures which shows an almost identical turbulent drag coefficient at low frequencies. However, the turbulent drag in 3He-B is substantially higher at higher frequencies. We also present measurements of the inertial drag coefficient for grid turbulence in 4He. The inertial drag coefficient is significantly reduced by turbulence in both superfluid and normal liquid 4He.

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  • Received 11 May 2012

DOI:https://doi.org/10.1103/PhysRevB.85.224533

©2012 American Physical Society

Synopsis

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Dragging Data out of Superfluids

Published 28 June 2012

Measurements of drag coefficients in helium at low temperatures can improve understanding of turbulence in both classical and quantum fluids.

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Authors & Affiliations

D. I. Bradley, S. N. Fisher*, A. M. Guénault, R. P. Haley, Mukesh Kumar, C. R. Lawson, Roch Schanen, P. V. E. McClintock, Lydia Munday, G. R. Pickett, Malcolm Poole, V. Tsepelin, and Paul Williams

  • Physics Department, Lancaster University, Lancaster, LA1 4YB, United Kingdom

  • *s.fisher@lancaster.ac.uk

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Issue

Vol. 85, Iss. 22 — 1 June 2012

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