EFFECT OF FRACTAL PARAMETERS OF SOOT AGGREGATES ON THEIR ABSORPTION AND SCATTERING PROPERTIES SIMULATED BY DISCRETE DIPOLE APPROXIMATION

International audienceThe objective of this study is to determine the impact of the fractal properties of methane soot issued from incomplete combustions on their absorption and scattering properties. The fractal properties are selected according to the bibliography. Sample numerical aggregates are generated accordingly. The absorption and scattering cross-sections, as well as the asymmetry factor are determined by our in-house developed DDA (discrete dipole approximation) code. Simulation results indicate a higher sensitivity of the radiative properties to the fractal dimension than to the prefactor. This sensitivity analysis aims to guide the choice of relevant characterization experiments of soot samples about the necessary precision on measurements and data collection, and also to decide on the extent of soot morphological properties to be considered in heat transfer simulations