Abstract
We present measurements of the dissipative turbulent drag on a vibrating grid in superfluid He 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. We present measurements on a similar grid in superfluid He-B at low temperatures which shows an almost identical turbulent drag coefficient at low frequencies. However, the turbulent drag in He-B is substantially higher at higher frequencies. We also present measurements of the inertial drag coefficient for grid turbulence in He. The inertial drag coefficient is significantly reduced by turbulence in both superfluid and normal liquid He.
1 More- Received 11 May 2012
DOI:https://doi.org/10.1103/PhysRevB.85.224533
©2012 American Physical Society
Synopsis
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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