NIST Time|NIST Home|About NIST|Contact NIST

HomeAll Years:AuthorKeywordTitle2005-2010:AuthorKeywordTitle

Comparisons of Soot Volume Fraction Measurements Using Optical and Isokinetic Sampling Techniques.


pdf icon Comparisons of Soot Volume Fraction Measurements Using Optical and Isokinetic Sampling Techniques. (316 K)
Choi, M. Y.; Mulholland, G. W.; Hamins, A.; Kashiwagi, T.

Combustion Institute/Eastern States Section. October 25-28, 1993, Princeton, NJ, 1-4 pp, 1993.

Keywords:

soot; optical measurement; volume fraction; sampling; experiments

Abstract:

In a previous study, the performance of a three-line optical probe technique for measuring soot volume fraction and temperature was assessed by conducting experiments in the path-invariant environment of a premixed flame. In that study, the temperature and soot volume fraction (fva, based on absorption measurements at 632.8 nm and fve, based on emission measurements at 900 nm and 1000 nm) measurements in a premixed ethylene/air flame were compared to the results of Harris and Weiner. Although the temperatures and mean soot volume fractions compared favorably, the discrepancy between fva and fve prompted new measurements to evaluate the importance of source wavelength on the fva measurements, scattering by soot particles, light absorption by 'large' molecules and the use of different indices of refraction reported in the literature.