Abstract
The morphological characteristics of soot are of primary importance to quantify its effect on climate forcing and human health and also to interpret the signals acquired in optically based soot diagnostics. In the present study, the morphology of soot particles produced in laminar coflow diffusion flames was investigated under different fuel and oxidizer conditions. Particles were sampled thermophoretically at the centerline at different heights above the burner in laminar diffusion flames of three common fuels, namely, ethylene, propane, and butane, at two sooting statuses, i.e., under the smoke point and at the smoke point. The oxygen content in the oxidizer stream was systematically varied. Different morphological parameters of mature soot, including primary particle number, aggregate radius of gyration, fractal dimension and prefactor, and overlapping, were obtained based on analysis of transmission electron microscopy images. The diameter and number of monomers were calculated by using automated meth...
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