Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 77: Focus Session: Quantum Turbulence and Imaging of Quantum Flow of Superfluids

TT 77.1: Hauptvortrag

Donnerstag, 15. März 2018, 09:30–10:00, H 0104

Quantum Turbulence: New Aspects of an Old Problem — •Carlo F. Barenghi — Newcastle University

Turbulence is everywhere: inside us (aorta flow), in devices which we build (jet engines) and around us (the atmosphere). From a physicist’s point of view, turbulence is an old problem; the governing Navier-Stokes equation has been known since the XIX century but predicting solutions is difficult due to the nonlinearity and the huge number of degrees of freedom simultaneously excited. Recent studies have revealed new aspects of the old turbulence problem in superfluid helium and in atomic Bose-Einstein condensates, systems close to absolute zero where quantum mechanics rules the behaviour of macroscopic amounts of matter. In some of the observed regimes, this ‘quantum turbulence’ is utterly simple (vortex line defects moving in a perfect background) yet it displays the same properties which we observe in ordinary turbulence such as the same distribution of kinetic energy over the length scales. In other regimes quantum turbulence shows different properties, involves unusual forms of energy dissipation or displays turbulent two-fluid behaviour of great complexity. This talk will introduce the problem and its new experimental and theoretical challenges.
C.F. Barenghi, L. Skrbek, and K.R. Sreenivasan, PNAS 111 (Suppl. 1), 4647 (2014).
M.C. Tsatsos, P.E.S. Tavares, A. Cidrim, A.R. Fritsch, M.A. Caracanhas, F.E.A. dos Santos, C.F. Barenghi, and V.S. Bagnato, Phys. Reports 622 1 (2016).