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SUMMARY:What goes up must come down... or in between?  - Nicolaos Petropou
 los (DAMTP)
DTSTART:20230203T130000Z
DTEND:20230203T140000Z
UID:TALK196384@talks.cam.ac.uk
CONTACT:108503
DESCRIPTION:In a statically stratified fluid where relatively light parcel
 s of fluid lie on top of denser ones\, fluid parcels perturbed vertically 
 feel restoring buoyancy forces that tend to bring them back to their equil
 ibrium position. If on top of that\, the fluid velocities vary in space\, 
 these fluid parcels will be deformed by velocity gradients and form elonga
 ted structures in the density field (or lamellae) on which diffusion will 
 be enhanced. Thus\, in the presence of velocity gradients\, the equilibriu
 m position of a vertically perturbed (initially at rest) fluid parcel will
  not be its initial position. By analysing the settling dynamic of a singl
 e lamella in a stratified Taylor-Couette flow and its equilibrium position
 \, we present experimental evidence of this coupled effect between density
  stratification and stretching-enhanced diffusion (i.e. mixing) and some i
 mplications for mixing in stratified shear flows. 
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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