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Measurement of Dimensionless Extinction Constant of Soot Generated Using Various Fuels.

pdf icon Measurement of Dimensionless Extinction Constant of Soot Generated Using Various Fuels. (442 K)
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.


National Institute of Standards and Technology, Gaithersburg, MD


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).