A compendium of research activities performed by the 'reactive flows and radiative transfer' group

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• Dr Rodolphe Vaillon, CNRS
• Monday 28 April 2008, 14:00-16:00
• Hopkinson Meeting Room, Engineering Department.

If you have a question about this talk, please contact kag1000.

Research activities carried out by the ‘reactive flows and radiative transfer’ group of the Thermal Science Center of Lyon are dedicated to the better understanding and control of heat transfer mechanisms involved in laminar and turbulent reactive flows.

In confined conditions, issues associated with interactions of a flame with the walls have to be addressed, including aerodynamics (flame – boundary layer interaction), physics (pressure and heat transfer) and chemical (quenching, pollutant emission) effects and related possible couplings. Analyses conducted on this topic will be briefly introduced.

As for radiating species (gases and particulates), they play a key role in reactive flows. Since a full and accurate method to model radiation from gases (the so-called Line-By-Line approach) is computationally too expensive, recourse to approximate techniques is compulsory. Recently, our group developed a new wide band and global modeling of radiation from gases in combustion thermophysical conditions (Spectral-Line Moment-Based and k-moment methods). Basics and sample results will be given.

Concerning radiation from soot, since those particles physically appear as chain-like aggregates of nano-sized spheres, associate 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 characteristic dimensions of the aggregate and the wavelength of the incident radiation so that they are both on the centimeter scale. Our recent developments employing this scaling principle in collaboration with Fresnel Institute (Marseille, France) will be shortly presented.

This talk is part of the Engineering Department Energy, Fluids and Thermo seminars series.

This talk is included in these lists:

• All Talks (aka the CURE list)
• Cambridge Energy Seminars
• Engineering Department Energy, Fluids and Thermo seminars
• Hopkinson Meeting Room, Engineering Department
• NanoDTC Energy Materials Talks
• School of Technology
• history

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