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Intermittent switching between potential flow and turbulence in superfluid helium at mK temperatures

Niemetz, M. ; Kerscher, H. ; Schoepe, Wilfried


Superfluid flow around an oscillating microsphere is investigated at temperatures down to 25 mK. Stable laminar flow below a critical velocity and turbulence at large drives are found to be separated below 0.5 K by an intermediate range of driving forces where the flow is unstable, intermittently switching between laminar and turbulent phases. We have recorded time series of this switching ...


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