Publicado 4 números por año
ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336
Indexed in
OBSERVATION OF THE SHAPE AND SIZE OF BUBBLES GENERATED IN A MOLTEN METAL BATH USING AN X-RAY FLUOROSCOPE
SINOPSIS
In the present study, the so-called hot model experiments were carried out to reveal the characteristics of bubbles in a molten metal bath. Ar gas was injected vertically upward into a molten pig iron bath at 1,250 °C through a lance made of quartz. Bubbles formed at the lance exit were observed using a high voltage X-ray fluoroscope and a high-speed video camera. The bubble frequency and bubble rising velocity were determined using an image processing technique. Changes in the shape and size of bubbles with respect to Ar gas flow rate were very similar to that observed in aqueous systems. Bubbles increased in size with an increase in the gas flow rate. The bubbles were ellipsoid in shape when the gas flow rate was relatively low. As the gas flow rate increased further, the doublet was observed. Small bubbles generated due to disintegration of large bubbles were observed when the gas flow rate exceeded a certain critical value. An empirical correlation of an equivalent bubble diameter was proposed.