Rights statement: ©2012 American Physical Society
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Turbulent drag on a low-frequency vibrating grid in superfluid He-4 at very low temperatures
AU - Bradley, D. I.
AU - Fisher, S. N.
AU - Guénault, A.M.
AU - Haley, R. P.
AU - Kumar, Mukesh
AU - Lawson, C. R.
AU - Schanen, Roch
AU - McClintock, P. V. E.
AU - Munday, Lydia
AU - Pickett, G. R.
AU - Poole, Malcolm
AU - Tsepelin, V.
AU - Williams, Paul
N1 - ©2012 American Physical Society
PY - 2012/6/28
Y1 - 2012/6/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84863336155&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.85.224533
DO - 10.1103/PhysRevB.85.224533
M3 - Journal article
VL - 85
SP - -
JO - Physical review B
JF - Physical review B
SN - 1098-0121
IS - 22
M1 - 224533
ER -