ガス吹込みによる溶銅浴中の気泡特性

概要

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Bubble characteristics in a molten copper bath at 1250℃ 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 f_B, mean bubble rising velocity u_B^^- and mean bubble diameter d_B^^-. 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 cm^3/s (at 1250℃), which was adjusted using a mass flow controller. Measured values of α, f_B, u_B^^- and d_B^^- 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.
社団法人日本機械学会の論文
1996-01-25