Impact of the competition between aggregation and surface growth on the morphology of soot particles formed in an ethylene laminar premixed flame - Normandie Université Access content directly
Journal Articles Journal of Aerosol Science Year : 2021

Impact of the competition between aggregation and surface growth on the morphology of soot particles formed in an ethylene laminar premixed flame

Abstract

Soot particle surface growth may have a significant impact on aggregation kinetics, particle morphology, and both aggregate and monomer size distributions. Particularly, the morphological effects of surface growth are currently poorly understood. This is complex since surface growth also affects the kinetics of aggregation resulting in a time-dependent competition between both phenomena, producing very different morphological markers. The present study aims at improving our understanding of the morphological impact of surface growth by implementing this effect in a Monte Carlo discrete element code for the simulation of soot formation in an ethylene premixed flame. An asymptotic average primary particle overlapping ∼30% is observed for different flame conditions. The primary particle coordination number is highly sensitive to surface growth rate and particle volume fraction, and maximum values are on average within the 4 - 8 range. The particle local compacity, as quantified by the packing factor, is also considerably increased when aggregates experience surface growth, contrarily to the fractal structure of individual aggregates that seems more dependent on the aggregation regime. Finally, surface growth narrows both the primary particle and aggregate size distributions.
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Dates and versions

hal-03090072 , version 1 (02-01-2023)

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Attribution - NonCommercial

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José Morán, Alexandre Poux, Jérôme Yon. Impact of the competition between aggregation and surface growth on the morphology of soot particles formed in an ethylene laminar premixed flame. Journal of Aerosol Science, 2021, 152, pp.105690. ⟨10.1016/j.jaerosci.2020.105690⟩. ⟨hal-03090072⟩
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