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Agglomerate parameters and fractal dimension of soot using light scattering—effects on surface growth

1991; Elsevier BV; Volume: 87; Issue: 1 Linguagem: Inglês

10.1016/0010-2180(91)90029-b

1556-2921

T.T. Charalampopoulos, H. Chang,

nanoparticles nucleation surface interactions

Measured scattering, extinction coefficients, and dissymmetry ratios at 0.488 μm from a premixed propane-oxygen flame with a fuel equivalence ratio of φ0 = 1.8 are combined with the scattering and extinction model for agglomerates to determine each of the following: primary particle diameter, number density of primary particles, and the total number of agglomerates as a function of position in the flame. The inferred primary particle diameters vary in the range from 0.009 to 0.029 μm whereas the fractal dimension of the agglomerate was estimated to be 1.7. In addition, both the Mie and agglomerate analysis of scattering and extinction data yield effective diameters that differ only by 1.8% or less for this type of flame system. However, the growth rates determined from the Mie scattering and extinction analysis are found to be higher by 106% or more when compared with the growth rates inferred from the agglomerate analysis.