关键词: 发泡剂, 偶氮二甲酰胺, 传质, 气液固三相反应, 速率控制步骤

Abstract: Water model was used to study the mechanism of vortex formation in the mould, and the effects of operation parameters on vortex formation were investigated. The results show that singular vortex or a pair of vortices appear intermittently on the one side of nozzle, and the formation of vortex is due to the interaction of two surface streams flowing inwards. The frequency of vortex increases with the augment of the casting speed, and decreases with the augment of the immersion depth and nozzle angle. The formation of vortex can be inhibited by optimizing the submerged entry nozzle.

Key words: continuous casting, mould, vortex, physical modeling