Measurements of the Size Distribution and Aerodynamic Properties of Soot
Measurements of the Size Distribution and Aerodynamic Properties of Soot
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Date
1989
Authors
Cleary, Thomas George
Advisor
Gentry, James W.
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Abstract
The particle size distribution and aerodynamic properties of soot
agglomerates formed by the combustion of acetylene is studied. A
positive pressure soot generator was constructed which allowed for
the characterization of the soot aerosol. Nearly monodisperse
particles (10 to 20 nm in diameter) have been observed at low
acetylene flow rates. The mean size and width of the distribution
are confirmed with a diffusion battery and a differential mobility
analyzer. Size distribution measurements of soot agglomerates have
been obtained from optical and electron microscopy for a range of
acetylene flow rates. The electron microscopy results are compared
to model predictions of the cluster size distribution. Friction
coefficient measurements from electrical mobility classified
agglomerates have been made and are compared to fractal models for
clusters. Aerodynamic diameters of impacted agglomerates are related
to the geometric mean size form optical microscopy. These results
suggest that the geometric mean size can replace the spherical
diameter if a particle density of 0.1 g/cc is assumed.