Abstract
A study on dispersion of gas injected into mercury has been made by using an electroresistivity probe technique. The column diameter was 7 or 10 cm and the depth of the mercury bath was 10-70cm. Nitrogen was blown through a single nozzle (O. D. ×I. D. =1.0×0.6, 0.7×0.2, 0.4×0.24cm) into the bath. The gas flow rate was 50-1330 (cm3/s, 1 atm). Measurements were made for the size of bubbles formed at the nozzle and rising in the bath. It was found that the empirical correlation obtained previously for the size of bubbles formed at nozzles in lower gas flow rates was applicable to estimate the size of bubbles in the present gas flow rates. The volume-surface mean diameter of the bubble swarm in mercury increased with increasing the superficial gas velocity. An equation was obtained to describe the effects of liquid physical properties on the average size of bubbles in the swarm. The equation was used to estimate the average size of bubbles rising in molten iron.
