溶融金属中の単一ノズルからの気泡生成について

抄録

Studies have been made on the formation of bubbles in mercury and in liquid silver by using the single nozzle facing upward. Nozzles used in the experiments are of the sizes 0.22-0.82cm in O. D. and 0.10-0.30cm in I. D. The gas chamber volume V_c and the gas flow rate V_g are varied from 0.15 to 200cc and from 0.0167 to 70cc/ sec, respectively. The size of bubbles is determined from the frequency of bubble formation and the gas flow rate.
A table is presented to show the effects of V_c and V_g on the size of bubbles. The size of bubbles found experimentally is compared with that calculated from theoretical or experimental equations obtained for wetted nozzles. The experimental values of bubble size do not agree with the values calculated using the inner diameter of the nozzle. On the other hand, when the non-wettability of the nozzles in liquid metals is taken into account and the outer diameters are adopted as the nozzle diameters in the equations, a close agreement between the experimental and the calculated results is obtained. Thus, it is shown that the quantitative estimation of the size of bubbles from a single nozzle in liquid metals is possible.