Thermal radiation of spherical and cylindrical soot particles

Conference · Wed Oct 01 04:00:00 EDT 1980

OSTI ID:6872754

Lee, S C; Tien, C L

The effect of soot shape on soot radiation from flame and smoke is considered in the present study. It is realized that soot particles generally conglomerate into different shapes, while the limiting bounds are being either spherical or long chains. By modelling the long chains as infinite cylinders, it is shown that the radiation extinction characteristics of the spherical and cylindrical soot are distinctly different, with that of the spherical particles exhibiting a cut-off wavelength phenomenon. Emissivity from a cloud of cylindrical particles is always higher than that of the spheres due to their higher extinction coefficients. Moreover, the effect of soot shape on radiation is more pronounced at typical smoke temperatures (300/sup 0/K) than at flame temperatures. A simple experimental method is also proposed for determining the amount of cylindrical and spherical particles in a cloud.

• Research Organization: California Univ., Berkeley (USA). Dept. of Mechanical Engineering
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6872754
• Report Number(s): LBL-11656; CONF-8010104-2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AEROSOLS
COLLOIDS
COMBUSTION PRODUCTS
CONFIGURATION
CYLINDRICAL CONFIGURATION
DISPERSIONS
ELECTROMAGNETIC RADIATION
EMISSIVITY
FLAMES
OPTICAL PROPERTIES
PARTICLES
PHYSICAL PROPERTIES
RADIATIONS
RESIDUES
SHAPE
SMOKES
SOLS
SOOT
SPHERES
SURFACE PROPERTIES
TEMPERATURE EFFECTS
THERMAL RADIATION