Prediction of the Period of Swirl Motion Appearing in Gas Injection Processes at High Temperatures

A swirl motion induced by gas injection through a bottom nozzle has high mixing ability and useful for the mixing of a molten steel bath in the refining processes. As one of the fundamental characteristics of the swirl motion, the period is mentioned in this study. A semi-empirical equation is proposed for the period of swirl motion by referring to the rotary sloshing appearing in a cylindrical vessel oscillated in the vertical or the horizontal direction.