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SUMMARY:Julien Salort - Local investigation of turbulent thermal flows   -
  Julien Salort\, Laboratoire de Physique ENS\, Lyon
DTSTART:20140424T103000Z
DTEND:20140424T113000Z
UID:TALK51595@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Turbulent thermal convection is a process that occurs naturall
 y in a wide range of\nnatural and industrial systems. One possible model s
 ystem\, widely used to study this problem is the Rayleigh-Bénard cell: a 
 fluid layer confined in a closed cell with adiabatic walls\, heated from b
 elow and cooled from above.\nAlthough this is one of the first non-linear 
 model system that was investigated nearly a century ago\, the emergence an
 d the role of turbulence inside the boundary layers and their consequences
  on the global heat transfer are still open for debate. \nIt is now clear 
 however that the plates and the boundary conditions play a crucial role in
  the dynamics of the system. \n\nTo understand how instabilities develop n
 ear the plates and how they affect the general dynamics of heat transport\
 , our approach is to purposely change the plate properties to trigger tran
 sitions in the boundary layers. One possibility is to introduce controlled
  plate roughnesses\, and study how the basic constituents of the thermal h
 eat transport\, namely thermal plumes\, are modified. To figure out the in
 teraction between plumes\, we now aim at local heat flux measurements. We 
 are designing a dedicated sensor in the clean room\, based on silicon micr
 o-electro-mechanical-systems (MEMS) technology. This will give access to b
 oth the local velocity and temperature\, hence making it possible to measu
 re local velocity-temperature correlations and the turbulent contribution 
 to the heat flux.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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