Surface Growth of Soot Particles in Premixed Ethylene/Air Flames

Abstract

The surface growth rate of soot increases steeply with increasing equivalence ratio. We have found that the increased growth rate is accounted for primarily by the increased surface area available for growth rather than by increased concentrations of surface growth species. We have shown thai the surface growth species are not depleted by the process of surface growth. Our data suggest that the surface growth seen in our flames can be accounted for primarily by reaction of acetylene with the soot particles.

Cluster–Cluster Aggregation Kinetics and Primary Particle Growth of Soot Nanoparticles in Flame by Light Scattering and Numerical Simulations

“…j , where j is the order of the reaction with respect to C 2 H 2 (76). The range of values of the specific surface growth rates found here are in accord with the typical data reported in the previous literature (77).…”

Thermophoretic force and velocity of nanoparticles in the free molecule regime

“…The material properties used in the calculation are found in Table IV of [2]. Soot is assumed to be composed of carbon only and its density is chosen to be 1.8 g / cm 3 [38]. In this figure, the solid lines are calculated using ϵ 0.9 for the Waldmann thermophoretic velocity, a value traditionally used in computing the thermophoretic velocity [9,18] and the drag force [19,20].…”

Study of deposit morphology in a propane diffusion-flame under fuel-rich conditions

“…Recently, the roles of polycyclic aromatic hydrocarbons (PAHs) as soot precursors in the sooting process have been investigated in numerous works [1][2][3][4][5][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In 1997, Vander Wal et al [13] suggested that the appearance of a ''dark'' region separating the PAH-and soot-containing regions was caused by reduced number densities of both initiated soots and large soot precursors using simultaneous laser-induced fluorescence (LIF) and laser-induced incandescence (LII) detection.…”