Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Published byGriffin Preston Stephens Modified over 9 years ago

Similar presentations

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

1 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

2 The system (A) Mechanical flow generation: Bellows [present work] (B) Thermal flow generation: counterflow heater Liquid Helium-4 1.3 K < T < 2.0 K @ saturated vapour pressure [Chagovets & Skrbek, PRL 100, 215302 (2008) JLTP 153,162 (2008)] sq 7 mm 115 mm N S counterflow

3 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

4 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

5 Slopes A B (Schwarz PRB 18 (1978) 245) D C Tough et al. PRL 46 (1981) 658 0.13 X 80 mm C

6 Critical velocity A B C from extrapolation from direct measurement A

7 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 -0.13 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

8 Extra: comparison of L from other systems

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

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

Similar presentations

A mathematical model of steady-state cavitation in Diesel injectors S. Martynov, D. Mason, M. Heikal, S. Sazhin Internal Engine Combustion Group School.

A mathematical model of steady-state cavitation in Diesel injectors S. Martynov, D. Mason, M. Heikal, S. Sazhin Internal Engine Combustion Group School.
Charles A. Ward Thermodynamics and Kinetics Laboratory, University of Toronto Fluid Behavior In Absence Of Gravity: Confined Fluids and Phase Change Second.

Charles A. Ward Thermodynamics and Kinetics Laboratory, University of Toronto Fluid Behavior In Absence Of Gravity: Confined Fluids and Phase Change Second.
Vortex instability and the onset of superfluid turbulence

Vortex instability and the onset of superfluid turbulence
Two scale modeling of superfluid turbulence Tomasz Lipniacki

Two scale modeling of superfluid turbulence Tomasz Lipniacki
Focus: Detecting vortices/turbulence in pure superfluid 4 He at T

Focus: Detecting vortices/turbulence in pure superfluid 4 He at T
University of Newcastle, UK Collisions of superfluid vortex rings Carlo F. Barenghi Nick Proukakis David Samuels Christos Vassilicos Charles Adams Demos.

University of Newcastle, UK Collisions of superfluid vortex rings Carlo F. Barenghi Nick Proukakis David Samuels Christos Vassilicos Charles Adams Demos.
The left panel shows a suspension of hydrogen particles just above the transition temperature. The right panel shows the same particles after the fluid.

The left panel shows a suspension of hydrogen particles just above the transition temperature. The right panel shows the same particles after the fluid.
An introduction to superfluidity and quantum turbulence

An introduction to superfluidity and quantum turbulence
Quantum turbulence - an overview

Quantum turbulence - an overview
Quantum Turbulence in Helium Superfluids L. Skrbek Joint Low Temperature Laboratory, Institute of Physics ASCR and Charles University V Holešovičkách 2,

Quantum Turbulence in Helium Superfluids L. Skrbek Joint Low Temperature Laboratory, Institute of Physics ASCR and Charles University V Holešovičkách 2,
Experiments on homogeneous quantum turbulence in 4 He: what do we really know, and what can we hope to do in the future? Andrei Golov Thanks: Paul Walmsley,

Experiments on homogeneous quantum turbulence in 4 He: what do we really know, and what can we hope to do in the future? Andrei Golov Thanks: Paul Walmsley,
MAE 5130: VISCOUS FLOWS Introduction to Boundary Layers

MAE 5130: VISCOUS FLOWS Introduction to Boundary Layers
VORTEX RECONNECTIONS AND STRETCHING IN QUANTUM FLUIDS Carlo F. Barenghi School of Mathematics, Newcastle University, Newcastle upon Tyne, UK.

VORTEX RECONNECTIONS AND STRETCHING IN QUANTUM FLUIDS Carlo F. Barenghi School of Mathematics, Newcastle University, Newcastle upon Tyne, UK.
9 th HEDLA Conference, Tallahassee, Florida, May 3, 2012 Spontaneous Deflagration-to-Detonation Transition in Thermonuclear Supernovae Alexei Poludnenko.

9 th HEDLA Conference, Tallahassee, Florida, May 3, 2012 Spontaneous Deflagration-to-Detonation Transition in Thermonuclear Supernovae Alexei Poludnenko.
MODELING OF SUDDEN HYDROGEN EXPANSION FROM CRYOGENIC PRESSURE VESSEL FAILURE Guillaume Petitpas and Salvador M. Aceves Lawrence Livermore National Laboratory.

MODELING OF SUDDEN HYDROGEN EXPANSION FROM CRYOGENIC PRESSURE VESSEL FAILURE Guillaume Petitpas and Salvador M. Aceves Lawrence Livermore National Laboratory.
Phonons in a 2D Yukawa triangular lattice: linear and nonlinear experiments Dept. of Physics and Astronomy, University of Iowa supported by DOE, NASA,

Phonons in a 2D Yukawa triangular lattice: linear and nonlinear experiments Dept. of Physics and Astronomy, University of Iowa supported by DOE, NASA,
Reliability Prediction of a Return Thermal Expansion Joint O. Habahbeh*, D. Aidun**, P. Marzocca** * Mechatronics Engineering Dept., University of Jordan,

Reliability Prediction of a Return Thermal Expansion Joint O. Habahbeh*, D. Aidun**, P. Marzocca** * Mechatronics Engineering Dept., University of Jordan,
Measuring segregation of inertial particles in turbulent flows by a Full Lagrangian approach E. Meneguz Ph.D. project: Rain in a box of turbulence Supervisor:

Measuring segregation of inertial particles in turbulent flows by a Full Lagrangian approach E. Meneguz Ph.D. project: Rain in a box of turbulence Supervisor:
Mark Claywell & Donald Horkheimer University of Minnesota

Mark Claywell & Donald Horkheimer University of Minnesota
Quantum liquids in Nanoporous Media and on Surfaces Henry R. Glyde Department of Physics & Astronomy University of Delaware National Nanotechnology Initiative.

Quantum liquids in Nanoporous Media and on Surfaces Henry R. Glyde Department of Physics & Astronomy University of Delaware National Nanotechnology Initiative.

Similar presentations

Ads by Google