A unified model of slagging particle deposition behavior with thermophoresis and dynamic mesh based on OpenFOAM

This study used a unified algorithm to calculate the deposition process of slagging particles by coupling five submodels and revising thermophoretic force and particle adhesion models based on dynamic mesh technology. The model predicted deposition thickness with an error of 7.66%. Results showed that thermophoretic forces can extend slagging particle transport range and facilitate the impact of particles below 18 mu m on the probe, with impact and deposition efficiencies of 55% and 15%, respectively. Particles sized 25-40 mu m and with 0.004-0.007 mJ energy are easily captured by the probe, and escaped particles have a temperature 100 K lower than deposited particles. Moreover, the deposition process of slagging particles is significantly staged with the properties of the deposited particles at different stages corresponding to the initial and sintered deposition layers. Average particle size within the second stage (40-100 min) was higher than that of the first stage (0-40 min) with 32 and 27 mu m, but the average particle temperature was lower than that of the first stage with 1280 and 1320 K, which is an important reason of deposition stratification.