Inclusion's Removel Mechanism in Liquid Steel of Continuous Casting Tundish

Three dimensional velocity distribution and turbulence energy dissipation of the steel in tundish are calculated. Then, the mathematical model of collision removal and flotation removal is established. In this collision mode,the rate constants of all types of collision are concluded, the change rate of inclusion number density is obtained.The quantitative calculation shows that it is violent turbulence at the inlet area of tundish and that collision is the main removal type to those inclusions with radius from 0 to 25μm.The collision of inclusions has two effect: one is to decrease the number of small inclusions, the other is to increase the number of big inclusions.To calculate the removal of inclusions, both collision and flotation should be considered. At last, the result of industrial experiment proves the collisien model is true.