Abstract
Accumulation of soot particles on the wall of a constricted pipe, through which JP4 liquid jet fuel flows, is investigated numerically, using a pipe with a bump on its wall. The effects of particle size, particle-to-fluid density ratio and carrier fluid flow Reynolds number, on particle accumulation, are investigated. When the particles' size is relatively large, with particle-to-fluid density ratio greater than unity, and at relatively large Re number, the largest accumulation of particles occurs near the bump's front wall where those particles are blocked by the protruding bump and are too massive to be carried away by the nearwall, low momentum carrier fluid. Conversely, when either the particles' size or the carrier fluid Re number is relatively small, or the density ratio is less than unity, the largest accumulation of particles occurs in one of three regions: on the bump's rear wall, near the center of the recirculation eddy, or at the flow detachment point. Particle-accumulation ratio on the bump's wall decreases monotonically as the particle size decreases (with the mass concentration of particles at the pipe inlet held fixed).