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Fluid flow phenomena in a cylindrical bath agitated by gas injection from a submerged top lance were investigated on the basis of cold model experiments. A swirl motion of liquid, which was sumilar to the rotary sloshing, was observed under a certain blowing condition. The critical condition for the cessation of the swirl motion was first experimentally clarified and subsequently the following experiments were made in the absence of the swirl motion. The vertical migration distance of bubbles from the lance exit was measured using an electro-resistivity probe, and an empirical correlation for it was proposed as a function of the modified Froude number. The axial and radial velocity components of liquid were measured for a water-air system using a two-dimensional laser Doppler velocimeter. Applicability of previous emperical correlations of the axial mean velocity proposed for the gas injection through a centric bottom bozzle to the present case was examined. An electro-chemical method was used to measure the mass transfer coefficient between a platinum flat plate and aqueous FeSO4 solution. In the region below the bubble plume, the so-called dead water region was observed.

Fluid Flow Phenomena in a Cylindrical Bath Agitated by Top Lance Gas Injection.