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On the Transition from Potential Flow to Turbulence Around a Microsphere Oscillating in Superfluid Helium-4

Niemetz, Michael ; Hänninen, Risto ; Schoepe, Wilfried


The flow of superfluid around a translationally oscillating sphere, levitating without mechanical support, can either be laminar or turbulent, depending on the velocity amplitude. Below a critical velocity that scales as and is temperature independent below 1 K, the flow is laminar (potential flow). Below 0.5 K, the linear drag force is caused by ballistic phonon scattering that vanishes as until ...


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