Numerical Simulation on Collision and Aggregation Process of Al₂O₃ Inclusions with Different Morphology Characteristics

Abstract

In this paper, firstly, the morphology characteristics of aggregated Al2O3 inclusion were quantitatively described by fractal dimension and hydrodynamic radius. Then, a general collision-agglomeration model was established to describe the collision and agglomeration process of Al2O3 inclusions with different morphology characteristics. The results showed that: in the collision and agglomeration process of Al2O3 inclusions with different morphology characteristics, the number density of monomer inclusion decreases with time, but that of new aggregated inclusions, firstly increases to the maximum value, then decreases sharply; the smaller the fractal dimension of new aggregated inclusion, the more rapid decrease of number density of monomer inclusion and the larger agglomeration rate of new aggregated inclusions. so in order to accelerate the removal rate of micro inclusion particles, it is a viable way that keeping the fractal dimension of new aggregated inclusions at an appropriate value, not too small.