Abstract
Modeling of spallation polymer particles in polymer ablated arcs was conducted to numerically simulate its dynamics and thermal decomposition. We had found that spallation particles ejected from the polyamide materials contacting thermal plasmas experimentally. For the modeling of the particle dynamics, the temperature and gas flow fields in polymer ablated arcs were calculated as a background plasma at first. Using the calculated temperature and gas flow fields in polymer ablated arcs, we computed the trajectories of the particles flying in the polymer ablated arc, considering the time variations in the temperature and the diameter of the particles. This computation accounted for the temperature distribution inside the particle, melting and thermal decomposition of the particle. The polyamide-6 (PA6) particle in the PA6 ablated arc was dealt with. As a result, the temperature variation including the phase changes, and the decrease in diameter were simulated for PA6 particles in the PA6 ablated arc. Results also indicate that a particle with a diamater of 0.3mm and a velocity of 5m/s can reach the high-temperature arc core in a 6mm diamater PA6 tube.
