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

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Article number224533
<mark>Journal publication date</mark>28/06/2012
<mark>Journal</mark>Physical review B
Issue number22
Number of pages10
Pages (from-to)-
Publication StatusPublished
<mark>Original language</mark>English


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.

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©2012 American Physical Society