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

Bradley, D. I. and Fisher, S. N. and Guénault, A.M. and Haley, R. P. and Kumar, Mukesh and Lawson, C. R. and Schanen, Roch and McClintock, P. V. E. and Munday, Lydia and Pickett, G. R. and Poole, Malcolm and Tsepelin, V. and Williams, Paul (2012) Turbulent drag on a low-frequency vibrating grid in superfluid He-4 at very low temperatures. Physical review b, 85 (22). -. ISSN 1098-0121

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    Abstract

    We present measurements of the dissipative turbulent drag on a vibrating grid in superfluid He-4 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 He-4. We present measurements on a similar grid in superfluid He-3-B at low temperatures which shows an almost identical turbulent drag coefficient at low frequencies. However, the turbulent drag in He-3-B is substantially higher at higher frequencies. We also present measurements of the inertial drag coefficient for grid turbulence in He-4. The inertial drag coefficient is significantly reduced by turbulence in both superfluid and normal liquid He-4.

    Item Type: Article
    Journal or Publication Title: Physical review b
    Additional Information: ©2012 American Physical Society
    Subjects: Q Science > QC Physics
    Departments:
    ID Code: 56395
    Deposited By: ep_importer_pure
    Deposited On: 31 Jul 2012 09:36
    Refereed?: Yes
    Published?: Published
    Last Modified: 23 Jul 2014 15:02
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/56395

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