Modeling aerosol formation in opposed-flow diffusion flames.
The microstructures of atmospheric pressure, counter-flow, sooting, flat, laminar ethylene diffusion flames have been studied numerically by using a new kinetic model developed for hydrocarbon oxidation and pyrolysis. Modeling results are in reasonable agreement with experimental data in terms of concentration profiles of stable species and gas-phase aromatic compounds. Modeling results are used to analyze the controlling steps of aromatic formation and soot growth in counter-flow configurations. The formation of high molecular mass aromatics in diffusion controlled conditions is restricted to a narrow area close to the flame front where these species reach a molecular weight of about 1000 u. Depending on the flame configuration, soot formation is controlled by the coagulation of nanoparticles or by the addition of PAH to soot nuclei.
Violi
Angela
A
Department of Chemical and Fuels Engineering, University of Utah, 1495 E 100 S, Room 109, Salt Lake City, UT 84112, USA. violi@eng.utah.edu
D'Anna
Andrea
A
D'Alessio
Antonio
A
Sarofim
Adel F
AF
D000336:Aerosols; D000392:Air Movements; D000393:Air Pollutants / Q000032:analysis*; D001274:Atmospheric Pressure; D004058:Diffusion; D017745:Incineration; D007700:Kinetics; D008962:Models, Theoretical; D008970:Molecular Weight; D010084:Oxidation-Reduction; D012037:Refuse Disposal
D000336:Aerosols; D000393:Air Pollutants