钢液中球状夹杂物颗粒受力情况的数值模拟

通过理论分析和数值模拟的方法,研究了1873 K钢液中球状夹杂物颗粒运动过程中的受力情况.静止钢液和湍流场中,夹杂物颗粒所受的压力梯度力、虚拟质量力、Saffman力及Magnus力较小,可以忽略不计.静止钢液和均匀湍流场中,随着夹杂物颗粒尺寸的变大,颗粒所受Brown力逐渐衰减,当夹杂物颗粒直径大于20μm时颗粒所受Brown力基本不会对其运动造成影响,可以忽略不计.小于10μm的夹杂物颗粒布朗运动较为剧烈,单位质量夹杂物颗粒所受Basset力和Brown力较大,成为主导夹杂物颗粒运动的主要作用力;尺寸较大的夹杂物颗粒(直径D>50μm),Basset力、质量力和Stokes力共同作用影响夹杂物颗粒的运动、碰撞和去除.

Numerical simulation of the force condition of spherical inclusion particles in liquid steel

The force condition of spherical inclusion particles in 1873 K liquid steel was investigated by theoretical analysis and numeric simulation. It is found that the pressure gradient Force, virtual mass force, Saffman force and Magnus force are little and can be ignored in static steel and turbulent flow fields. With increasing inclusion particle size, the Brown force imposed on the particles with a bigger size gradually decreases in static liquid steel and homogeneous turbulence fields. When the particle size is bigger than 20 μm, the Brown force will have no influence on particle movement and can be ignored. The Brown motion of the particles with the size smaller than 10 μm is very violent, the Basset force and Brown force imposed on the particles per unit mass become the main force determining particle movement. As for the big-size particles (D>50 μm), the Basset force, mass force and Stokes force work together to influence the movement, collision and removal of the particles.