抄録
A novel electro-resistivity probe was developed for measuring the bubble characteristics in a molten iron bath subject to centric bottom Ar gas injection. This probe is able to be continuously used for about two hours at a bath temperature of 1250°C. The radial and vertical distributions of gas holdup α, bubble frequency fB, bubble rising velocity uB and bubble diameter dB were measured for the Ar gas flow rate of 50 and 100cm3/s (at 1250°C). The Ar gas preheated up to 1250°C was injected from the bottom nozzle at 1250°C.
The results were compared with empirical correlations derived from cold and hot model experiments. The values of α, fBanduB measured in the vicinity of bath surface 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 those of Sano et al. and Irons ea al.
