Measurement of Dimensionless Extinction Constant of Soot Generated Using Various Fuels.
Measurement of Dimensionless Extinction Constant of Soot
Generated Using Various Fuels.
Zhou, Z.; Choi, M. Y.
National Institute of Standards and Technology (NIST)
and Society of Fire Protection Engineers (SFPE).
International Conference on Fire Research and
Engineering (ICFRE). Proceedings. September 10-15,
1995, Orlando, FL, SFPE, Boston, MA, Lund, D. P.;
Angell, E. A., Editor(s)(s), 292-297 pp, 1995.
Sponsor:National Institute of Standards and Technology,
fire research; soot; light extinction; premixed flames;
extinction; acetylene; experiments
Simultaneous optical light extinction and gravimetric
measurements are performed in the post-flame regions of
premixed flames to determine the dimensionless soot
extinction constant, Ke. This method consisted of
isokinetically sampling the soot at a known flow rate,
measuring the mass of soot collected and determining the
density of soot through helium pycnometry. The optical
measurements were then calibrated with accurate values
of soot volume fraction measured gravimetrically. To
reduce the uncertainties associated with soot reactions
within the sampling probe experiments were performed at
lower temperatures (500 K) using nitrogen dilution in
the mixing chamber. In these experiments using
acetylene/air flames, the dimensionless extinction
constant was determined to be 8.8+ 1.5. It is expected
that soot generated from various fuels will display
marked differences in morphology. Therefore, these
experiment will be used to determine whether Ke is
sensitive to the soot morphology (including radius of
gyration, Rg, and primary soot particle size dp).