Abstract
Bubble characteristics in a molten copper bath at 1250°C agitated by Ar gas injection were measured using a newly developed electroresistivity probe. The bubble characteristics are specified by gas holdup (void fraction) α, bubble frequency fB, mean bubble rising velocity uB^- and mean bubble diameter dB^-. Ar gas was injected through a centered single-hole bottom nozzle or an L-type lance at the same temperature as the bath. The Ar gas flow rate was 50 or 100 cm3/s (at 1250°C), which was adjusted using a mass flow controller. Measured values of α, fB, uB^- and dB^- were compared with their respective empirical correlations for these quantities proposed previously on the basis of the cold model experiments. Good agreement between the measured values and empirical correlations was seen in the bath, except near the nozzle exit.
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