Abstract
A swirl motion of a gas-liquid two-phase jet in a cylindrical vessel appeared under certain injecting conditions, and the bath was strongly agitated in the presence of the swirl motion. This phenomenon is beneficial for the refining of steel and the treatment of waste water. The critical conditions for the generation of the swirl motion were revealed in this study. Correlation methods were proposed for the critical conditions as functions of the water flow rate, gas flow rate, and the aspect ratio of the bath.