Basic Characteristics of a Swirl Motion of Bubbling Jet in a Cylindrical Vessel Accompanied by Particle Lifting

A swirl motion of a bubbling jet in a cylindrical vessel is useful for bath mixing. This paper describes the mixing of small solid particles initially settled on the bottom of a water-filled cylindrical bath. The bubbling jet is generated by injecting air through a J-shaped lance placed on the bath centerline. Experiments are made on the patterns of swirl motion, the occurrence condition of the deep-water wave type swirl motion accompanied by lifted-up particles, the amplitude and the period of the swirl motion. The measured values are compared with empirical and theoretical equations proposed previously for the bottom blown bath.