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Argon gas injection is widely used to prevent nozzle clogging during continuous casting of steel. Argon gas is well known to improve clogging resistance via several mechanisms1) which include preventing deoxidation products/inclusions from contacting the nozzle wall,2–4) flushing the inclusions off of the nozzle,4,5) promoting the flotation of inclusions,6) reducing negative pressure and air aspiration through the nozzle walls,4,7,8) and preventing chemical reactions between the steel and the nozzle refractory.6) However, unoptimized argon gas injection may be detrimental to final steel product quality. The annular or slug flows produced by abnormal high gas flow rate compared to the molten steel flow rate in a nozzle can produce asymmetric jet flow in the mold,9,10) shallower jet angle,11) and higher turbulence energy,11) resulting in severe surface velocity and level fluctuations,12) and finally causing surface defects in the final steel products.9–12) In addition, abnormal big bubbles easily float upwards to the surface near Bubble Behavior and Size Distributions in Stopper-Rod Nozzle and Mold during Continuous Casting of Steel Slabs