Abstract: Through simulation experiment, the mechanism of coagulation of particles in liquid under ultrasonic treatment was studied in order to guide the removing process of inclusions in liquid steel. The experimental results showed that in the ultrasonic power range of 15~30 W, the effect of acoustic stream was strong, and the particles in the liquid were forced to gather in the zone with low acoustic pressure. When the power level of ultrasonic treatment was less than a certain critical level (60 W in this work), the effect of ultrasonic vibration was stronger than that of cavitation, the particles in liquid were coalgulated to clusters, and the cavitation bubbles would help them coagulate. An empirical relationship between the diameter of particle clusters and input of ultrasonic power at this level was obtained as dcluster=0.539e0.523P (060 W).

Key words: ultrasonic wave, ultrasonic stream, inclusion, particles, coagulation, cavitation

摘要： 通过模拟实验研究揭示超声波对液相中微颗粒凝聚过程作用机理，为超声波去除钢液中夹杂提供实验依据. 在功率15~30 W的范围内，超声波的声流作用很明显，可将液相中的微颗粒聚集于声压较小的区域. 如果超声波功率在一定临界值(本研究为60 W)以下，振动作用将超过空化分散作用，使颗粒凝聚成团，生成的空化气泡起到聚集已生成的颗粒团并使之长大的作用，得到颗粒团粒径和超声功率的关系式为：dcluster=0.539e0.523P (060 W).

关键词: 超声波, 声流, 夹杂物, 颗粒, 凝聚, 空化