Introduction to quantum turbulence by Ladik Skrbek

Turbulence from Angstroms to light years

DATE:20 January 2018 to 25 January 2018
VENUE:Ramanujan Lecture Hall, ICTS, Bangalore

The study of turbulent fluid flow has always been of immense scientific appeal to engineers, physicists and mathematicians because it plays an important role across a plethora of known phenomena, extending from the quantum mechanical all the way to cosmological scales. The purpose of this discussion meeting is to bring together researchers who have made key contributions in various areas of turbulence to describe their latest research results and discuss open problems.

The talks will be in the broad areas listed below and will cover the spectrum from homogeneous isotropic turbulence to situations where shear breaks isotropy (as in the ocean, the atmosphere, solar fluid dynamics, and in engineering flows) to turbulent convection (as in the rotating Sun) and quantum turbulence:

Basic turbulence
Isotropic and homogeneous turbulence
Quantum turbulence
Cosmological turbulence
Boundary layers and lab flows
Geophysical and astrophysical flows
This meeting will be held around the Infosys - ICTS Subrahmanyan Chandrasekhar lectures to be delivered by Katepalli Sreenivasan. There will also be a special session to celebrate his scientific career.

0:00:00 Start
0:00:15 Introduction to quantum turbulence
0:01:39 Turbulence
0:03:09 Characteristics length scales in turbulence
0:04:09 Quantum turbulence occurs in quantum fluids
0:05:45 Pre-history of helium liquefaction
0:08:55 Helium
0:10:53 Phase diagram -4He
0:12:03 Measures of turbulence intensity
0:13:45 Oregon/Trieste Cryogenic turbulent convection cryostat
0:14:21 The first known superfluid: 4He
0:16:24 Various phases of liquid helium = quantum fluids
0:19:53 Ideal Bose gas
0:21:36 Quantum mechanical description of He II
0:26:11 Images of quantized vortices in low temperature condensates
0:35:15 Counterflow turbulence phenomenology (Vinen 1957)
0:36:54 Counterflow tangle (courtesy of M. Tsubota) He II
0:37:45 Working fluids for quantum turbulence
0:39:11 Classification scheme for QT
0:40:22 Classical versus quantum turbulence
0:44:30 quantum turbulence in a pure superfluid (T-0)
0:45:57 Recent results on visualization of cryogenic helium flows
0:49:46 Characteristic length scales in 4He turbulence
0:50:55 Quantum, or classical turbulence?
0:51:52 Small-scale universality in quantum turbulence
0:54:12 Decay of (two-fluid) quantum turbulence in He II
0:55:03 Andreev reflection in 3He-B
0:58:52 Summary
0:59:52 Q&A