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SUMMARY:Probing density-stratified turbulence and mixing using simultaneou
 s volumetric Particle Image Velocimetry (PIV) and Laser Induced Fluorescen
 ce (LIF) - Dr. Adrien Lefauve (DAMTP)
DTSTART:20220218T123000Z
DTEND:20220218T133000Z
UID:TALK170405@talks.cam.ac.uk
CONTACT:99736
DESCRIPTION:What are the properties of density-stratified\, shear-driven t
 urbulence? The turbulent mixing of air or water masses that have even slig
 htly different physico-chemical composition (e.g. temperature\, salinity) 
 is crucial to many engineering and geophysical flows\, from the ventilatio
 n in buildings\, to the dispersion of pollutants in rivers\, to the large-
 scale thermohaline ocean circulation regulating our climate.\n\nGiven the 
 complexity of the problem\, laboratory experiments play a crucial role to 
 fill the gap between direct field observations and numerical modelling. Th
 e Stratified Inclined Duct (SID) is a canonical experiment designed to stu
 dy the long-term behaviour of stably-stratified turbulence continuously fo
 rced by shear. This is achieved by setting up a two-layer exchange flow in
  a long rectangular duct connecting two large reservoirs containing differ
 ent salt solutions.\n\nI will introduce a new generation of experiments de
 veloped in the G. K. Laboratory in DAMTP to advance our understanding of t
 hese flows. These experiments rely on a new technique to measure the densi
 ty field and the three-component velocity field simultaneously in three-di
 mensional volumes at high spatio-temporal resolutions. This technique empl
 oys a thin\, pulsed vertical laser sheet that is scanned rapidly back and 
 forth to span a three-dimensional sub-volume. We then combine successive p
 lanar measurements of stereo particle image velocimetry (sPIV) and planar 
 laser induced fluorescence (PLIF) to re-construct three-dimensional volume
 s having full velocity and density data.\n\nI will also give a few example
 s of advances that have been made possible by these new measurements. I wi
 ll also outline what future improvements could bring to our study of strat
 ified turbulence and mixing.
LOCATION:CUED\, LT6
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