title: Modeling aerosol formation in opposed-flow diffusion flames.
abstract: 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.
authors.affiliation: 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
authors.forename: Angela
authors.initials: A
authors.lastname: Violi
authors.forename: Andrea
authors.initials: A
authors.lastname: D'Anna
authors.forename: Antonio
authors.initials: A
authors.lastname: D'Alessio
authors.forename: Adel F
authors.initials: AF
authors.lastname: Sarofim
mesh_terms: 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
chemical_list: D000336:Aerosols; D000393:Air Pollutants