Abstract
Experimental investigation was carried out on the effects of small particles on the occurrence region, starting time, Ts,s, damping time, Ts,d, amplitude, A, and period, Ts, of a swirl motion of a bottom blown bubbling jet in a cylindrical bath. The occurrence region of the swirl motion was affected by the particles only when the aspect ratio of the bath was higher than 0.7. The measured values of Ts,s, Ts,d, A, and Ts were hardly affected by the particles as long as the steady swirl motion occurred. Solid particles were lifted up into the bath in the presence of the swirl motion, and then dispersed in the whole bath. Under a specific condition, the swirl motion ceased through an effect of the dispersed particles, and as a result, lifting of solid particles also ceased. Such a series of events were periodically repeated.
