Two types of quantum turbulence: mechanically VS thermally driven 4 He superflow in a channel Simone Babuin, Mathias Stammeier, Miloš Rotter, Ladislav.

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Presentation transcript:

Two types of quantum turbulence: mechanically VS thermally driven 4 He superflow in a channel Simone Babuin, Mathias Stammeier, Miloš Rotter, Ladislav Skrbek SUPERFLUIDITY GROUP Joint Low Temperature Laboratory Institute of Physics, Academy of Sciences of the Czech Republic & Faculty of Mathematics and Physics, Charles University Prague, Czech Republic

The system (A) Mechanical flow generation: Bellows [present work] (B) Thermal flow generation: counterflow heater Liquid Helium K < T < 2.0 saturated vapour pressure [Chagovets & Skrbek, PRL 100, (2008) JLTP 153,162 (2008)] sq 7 mm 115 mm N S counterflow

What we measure Second sound resonance A0A0 A flow speed = 10 cm/s Peak maximum A0A0 A Temperature = 1.45 K w0w0 Scattering of second sound waves against vortex lines Assume vortex tangle homogeneous and isotropic Take into account scattering depends on angle average vortex line length per unit volume B(T): mutual friction coefficient k: quantum of circulation

Vortex line density Open symbols: from full resonant curve Full symbols: from peak maximum Mechanically driven flow Comparison with thermally drive flow 1.49K 1.58K 1.73K 1.92K A B A B

Slopes A B (Schwarz PRB 18 (1978) 245) D C Tough et al. PRL 46 (1981) X 80 mm C

Critical velocity A B C from extrapolation from direct measurement A

Summary of the main facts A and B disagree in (1), (2) and (3) A, C and D agree in (1) and (2), but disagree in (3) B, C and D agree in (3), but disagree in (1) and (2) A: present work -pure superflow -mechanically driven -7x7 mm2 sq channel -second sound att. B: TC&LS (2008) -pure superflow -thermally driven -7x7 mm2 sq channel -second sound att. C: Tough (1981) -pure superflow -thermally driven mm circ channel -temp gradients D: Schwarz theory (1978) -counterflow in frame of normal component -no boundaries (1)Functional relation between L and v (2)Magnitude of L across whole range of v (3)Critical velocity

Extra: comparison of L from other systems

Extra: temperature differences The temperature is measured inside the bellows, and the difference is before and during a bellows compression