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SUMMARY:A compendium of research activities performed by the 'reactive flo
 ws and radiative transfer' group - Dr Rodolphe Vaillon\, CNRS
DTSTART:20080428T130000Z
DTEND:20080428T150000Z
UID:TALK11774@talks.cam.ac.uk
CONTACT:8442
DESCRIPTION:Research activities carried out by the 'reactive flows and rad
 iative transfer' group of the Thermal Science Center of Lyon are dedicated
  to the better understanding and control of heat transfer mechanisms invol
 ved in laminar and turbulent reactive flows.\n\nIn confined conditions\, i
 ssues associated with interactions of a flame with the walls have to be ad
 dressed\, including aerodynamics (flame - boundary layer interaction)\, ph
 ysics (pressure and heat transfer) and chemical (quenching\, pollutant emi
 ssion) effects and related possible couplings. Analyses conducted on this 
 topic will be briefly introduced.\n\nAs for radiating species (gases and p
 articulates)\, they play a key role in reactive flows. Since a full and ac
 curate method to model radiation from gases (the so-called Line-By-Line ap
 proach) is computationally too expensive\, recourse to approximate techniq
 ues is compulsory. Recently\, our group developed a new wide band and glob
 al modeling of radiation from gases in combustion thermophysical condition
 s (Spectral-Line Moment-Based and k-moment methods). Basics and sample res
 ults will be given. \n\nConcerning radiation from soot\, since those parti
 cles physically appear as chain-like aggregates of nano-sized spheres\, as
 sociate radiative property models have to be assessed properly. Given that
  the characteristic dimensions of such particles in the optical domain is 
 often of the same order of magnitude as the wavelength of light (~micron)\
 , particles are too small to conveniently allow the building of aggregates
  with precisely controlled morphology. One practical solution known as the
  microwave analogy principle is to simultaneously scale both the character
 istic dimensions of the aggregate and the wavelength of the incident radia
 tion so that they are both on the centimeter scale. Our recent development
 s employing this scaling principle in collaboration with Fresnel Institute
  (Marseille\, France) will be shortly presented.\n
LOCATION:Hopkinson Meeting Room\, Engineering Department
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