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TRANSITION TO TURBULENCE IN 4HE DUE TO MECHANICAL OSCILLATORS

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We report on recent experiments on the transition to turbulence observed in both normal and superfluid 4He, including purely quantum turbulence at very low temperatures down to 10 mK. The transition to both classical and quantum turbulence has been investigated using mechanical oscillators in the form of quartz tuning forks and micromechanical goalpost structures. We investigate the differences between the transition to classical turbulence in normal He and to quantum turbulence in its superfluid phase, and discuss the changing characteristics of the dependence of drag coefficient vs. velocity with changing normal fluid and superfluid density fractions.

Author(s):

David Schmoranzer    
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic
Czech Republic

Martial Defoort    
Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France
France

Sebastien Dufresnes    
Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France
France

Eddy Collin    
Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France
France

Henri Godfrin    
Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France
France

Ladislav Skrbek    
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic
Czech Republic