1994 Volume 34 Issue 12 Pages 980-985
Present authors developed a new electro-resistivity probe being able to continuously measure bubble characteristics in a molten iron bath agitated by gas injection. The life of the probe was about two hours at a bath temperature of 1250°C. The axial and radial distributions of gas holdup α, bubble frequency fB, mean bubble rising velocity uB and mean bubble diameter dB were determined for the Ar gas flow rates of 50 and 100 cm3/s (at 1250°C). The Ar gas was preheated up to 1250°C and then injected through a single-hole centric bottom nozzle.
The results were compared with empirical correlations derived from cold and hot model experiments. The measured values of α, fB and uB in the upper part of the bath were approximated satisfactorily by correlations proposed by the present authors, but they did not agree with the experimental results of Kawakami et al. The measured values of dB were a little smaller than predicted values by Sano et al. and Irons et al.
