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Intermittent switching between turbulent and potential flow around a sphere in HeII at mK temperatures

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


Intermittent switching between potential flow and turbulence is observed with an oscillating sphere in HeII below 0.5 K, where there is no normal fluid component and no viscosity. The remaining dilute phonon gas is in the ballistic regime and therefore turbulence in the pure superfluid can be investigated. The amplitude of the driven oscillations is a measure of the damping which in case of ...


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