Abstract
The present work presents measurements of particle sizes of soot in flat pre-mixed flames of various hydrocarbons by means of light scattering and extinction. The experimental method is discussed with respect to necessary considerations for polydisperse particle systems. Different scatterer models are applied depending on the prevailing particle size and structure. The measurements are compared with results from a sampling technique involving the evaluation of electron micrographs of soot particles. In the Rayleigh regime of scattering the results from light scattering and extinction agree very well with results from soot particle samples, which were analysed with the electron microscope. In the evaluation of light scattering measurements the necessary higher moments of the size distributions may be derived from coagulation theory, which yields higher moments very close to those from soot particle samples. In the Mie regime of scattering the agreement is not as good due to the complex structure of the soot particles. In this range of particle sizes a dependence of the complex refractive index on particle age can be found from the non-linear regression analysis of the scattering intensities.
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