液体金属中の吹込みガスの分散挙動
1986 年 72 巻 10 号 p. 1552-1559
詳細
1986 年 72 巻 10 号 p. 1552-1559
The measurement of the distribution of gas holdup in nitrogen injection into mercury was made by using an electroresistivity probe technique and high speed data processing system. On the basis of the measurement near an orifice or nozzle, two regimes of gas flow are distinguished: bubbling and jetting. In the jetting regime, the gas jet issuing from the tuyere into mercury becomes very thin and rises rapidly. The radial distribution of gas holdup expands with increasing vertical distance due to entrainment of the surrounding liquid. The transition of flow behavior from jet to plume occurs about 3040 mm above the tuyere under the present experimental conditions.The effect of bath depth on the gas holdup is discussed.
The upward flow of gas-liquid mixture in the plume zone is analyzed on the basis of macroscopic mass and momentum balances. The calculated results of plume radius and gas holdup are compared with the experimental results. It is presumed that the circulating flow in the bath affects the dispersion of bubbles.
