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

Niemetz, Michael , Hänninen, Risto and Schoepe, Wilfried (2017) On the Transition from Potential Flow to Turbulence Around a Microsphere Oscillating in Superfluid Helium-4. Journal of Low Temperature Physics 187 (3), pp. 195-220.

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Abstract

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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Item type:Article
Date:30 January 2017
Institutions:Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Prof. Wilfried Schoepe
Identification Number:
ValueType
10.1007/s10909-017-1745-7DOI
Keywords:EINSTEIN CONDENSED GAS; CRITICAL VELOCITY; QUANTUM TURBULENCE; MK TEMPERATURES; HE-4; HELIUM; LAMINAR; ONSET; DYNAMICS; Quantum turbulence; Superfluid helium; Oscillatory flow; Critical velocity; Vortex shedding; Bose-Einstein condensates
Dewey Decimal Classification:500 Science > 530 Physics
Status:Published
Refereed:Yes, this version has been refereed
Created at the University of Regensburg:Yes
Item ID:35129
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