The relation between the aerodynamic diameter and some morphological parameters was studied for flame-generated aggregates.
$SiO_2$ aggregates were generated from $SiCl_4$ in premixed methane/air flames. These aggregates were sampled and classified according to their aerodynamic diameter by a cascade impactor; moreover, computer program was developed and tested to find morphological parameters(equivalent area diameter, fractal dimension, radius of gyration and maximum Feret`s diameter) of the aggregates. We calculated the parameters from the digitized images of the aggregate TEM micrographs.
The aerodynamic diameters of the sampled aggregates were larger than 0.4㎛ in this experiment. In most cases, fractal dimension of their projection image was very close to 2.0 for these large aggregates. It was found that the equivalent area diameter of these aggregates was approximately three times larger than the Stokes` diameter of them.
