Amplitude Measurement of Swirl Motion in a Cylindrical Bath Agitated by Intermittent Gas Injection

Abstract

　　　Gas injection is commonly used for agitating a molten metal bath in the refining processes such as the AOD process. Many water model experiments have been carried out to find out efficient injection methods. In the current processes gas is injected under steady state condition. The purpose of this study is to experimentally investigate the possibility of efficiency enhancement by unsteady gas injection. A J-shaped lance is used for intermittent air injection into a cylindrical water bath. The amplitude of the deep-water wave type of swirl motion is measured using a digital camera. The measured value of the amplitude became smaller than that observed under the steady gas injection.