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Flow of He II due to an oscillating grid in the low-temperature limit.

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<mark>Journal publication date</mark>06/2004
<mark>Journal</mark>Physical Review Letters
Issue number24
Pages (from-to)244501
<mark>Original language</mark>English


The macroscopic flow properties of pure He II are probed in the limit of zero temperature using an oscillating grid. As the oscillation amplitude passes a first critical threshold, the resonant frequency starts decreasing but the flow remains nondissipative. Beyond a second critical amplitude, the flow undergoes a transition to turbulence and becomes dissipative. Nonlinearity and hysteresis observed between the thresholds are attributed to a boundary layer of quantized vortices.