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Turbulent and ballistic drag of superfluid helium at low temperatures on an oscillating microsphere

Jäger, J. ; Schoepe, Wilfried


Transverse oscillations of a microsphere in liquid helium below 0.3 K are investigated. For small amplitudes we observe ballistic drag by phonons and3He impurities. At a threshold velocity amplitude the drag force increases discontinuously to a value determined by turbulence in the superfluid and varies with the square of the velocity amplitude. The turbulent drag coefficient is determined by the ...


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