Diffusion-flame studies of the chemical and physical mechanisms of soot formation from aromatic and substituted-aromatic fuels. Progress report, February 16, 1982-February 15, 1983
Effort this reporting period has been concentrated on the measurement of the diffusion constants of soot aerosols in both laminar premixed and diffusion flames and on preliminary analysis of the influence of the presence of cyclohexane on the decomposition of and soot formation from benzene. The diffusion coefficients of aerosol particles in the intermediate Knudsen number regime have been measured with the use of the dynamic light-scattering technique Photon Correlation Spectroscopy. The experimental values, obtained in flame generated aerosols as well as polystyrene microsphere aerosols, are compared to the diffusion coefficients theoretically predicted. It is found that these simple theories are in error by up to an order of magnitude, and over predict the diffusion constants for the aerosol particles in both the flame generated aerosols and the polystyrene microsphere aerosols. A speculative hypothesis is put forth that retains these theories as a limiting case for larger particles in this intermediate region. Concurrently with the light scattering studies in the flames, the pyrolysis of cyclohexane in a single pulse shock tube was investigated for reaction temperatures of 1400 to 2400 K and reaction pressures of 7 to 13 x 10/sup 5/ Pa. Additional studies were carried out for reactant systems of benzene and benzene/cyclohexane mixtures. Quantitative and qualitative analyses were performed for certain gaseous products of pyrolysis. Comparison of the gaseous yields of the cyclohexane, benzene, and benzene/cyclohexane mixtures indicates that the aliphatic and aromatic molecules decompose independently. Preliminary gravimetric results of the solid and liquid products reveal that the weight percent yield from the decomposition of mixtures of cyclohexane/benzene is greater over a temperature range of 1400 to 1700 K than from decomposition of either hydrocarbon by itself. 10 figures.
- Research Organization:
- Kansas State Univ., Manhattan (USA)
- DOE Contract Number:
- AC02-80ER10677
- OSTI ID:
- 6434594
- Report Number(s):
- DOE/ER/10677-5; ON: DE83009093
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diffusion flame studies of the chemical and physical mechanisms of soot formation from aromatic and substituted aromatic fuels. Progress report, February 15, 1981-February 15, 1982
Diffusion flame studies of the chemical and physical mechanisms of soot formation from aromatic and substituted aromatic fuels: Progress report for period February 16, 1984--February 15, 1985
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BENZENE
PYROLYSIS
CYCLOHEXANE
PARTICULATES
PARTICLE SIZE
SOOT
CHEMICAL REACTION YIELD
DIFFUSION
AEROSOLS
BURNERS
EXPERIMENTAL DATA
FLAMES
LIGHT SCATTERING
MIXTURES
POLYSTYRENE
PYROLYSIS PRODUCTS
RESEARCH PROGRAMS
SHOCK TUBES
SPECTROSCOPY
VERY HIGH TEMPERATURE
ALKANES
AROMATICS
CHEMICAL REACTIONS
COLLOIDS
CYCLOALKANES
DATA
DECOMPOSITION
DISPERSIONS
HYDROCARBONS
INFORMATION
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PARTICLES
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
SCATTERING
SIZE
SOLS
SYNTHETIC MATERIALS
THERMOCHEMICAL PROCESSES
YIELDS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry