In the metallurgical industry, various types of rotors are used for the injection and distribution of an immiscible phase and for circulating the molten metal at the same time. In the present work, the liquid-gas two-phase flow around an axial type impeller was studied in a water model, in order to analyze the bubble break-up and metal circulation. Details like primary and secondary bubble formation, coalescence, vortex structure, two phase vortex flow and flooding between the blades etc. were recorded by using high-speed photography. The variation of the overall flow pattern, metal pumping and bubble formation was followed in function of the rotational speed and gas flow rate. Finally the influence of the different flow patterns on the efficiency of the treatment of the metal is discussed.
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