Soot thermophoresis in curved laminar flames

In this work, the formation and evolution of soot in a planar diffusion C2H2 flame have been numerically investigated, using the Discrete Sectional Method (DSM) for solid phase kinetics. The flame is wrapped up by a line vortex injected from the fuel side. Three regions have been identified in the vortex, based on the local values of curvature and scalar dissipation rate. The goal of this work is to numerically investigate the impact of thermophoresis in each region of the vortex, showing the different soot distribution and the effect of the flame curvature on the local thermophoretic velocity. It has been found that in flat regions, thermophoresis dominates over the convective flow in defining soot position, while in curved ones it is almost negligible, since soot is mainly transported by convection.