In view of the ladle bottom argon blowing process, the mixing time was studied by changing the number of nozzles, position of single nozzle, angle between double nozzles, gas flow rate and thickness of slag layer in a water model experiment. A concept of critical gas flow was proposed. It was found that the mixing time decreases obviously when the gas flow rate is above the critical one. The result showed that when a single nozzle is used, the mixing time with the gas eccentric injection is shorter than with the gas center injection under the same gas flow rate, and the critical flow rate is smaller. When the double nozzles were used, the mixing time is shorter while the angle between nozzles increases and the critical flow rate is smaller.%针对钢包底吹氩工艺，通过改变透气砖数量、单透气砖吹气位置、双透气砖夹角、喷吹气体流量、渣厚等参数，对钢包的均混时间进行了水模型实验研究。提出临界流量的概念，发现吹气量超过临界流量后均混时间明显减小。结果表明：单透气砖喷吹时，相同吹气量下偏心喷吹时的均混时间比中心喷吹时短，临界流量小；双透气砖喷吹时，透气砖夹角越大，均混时间越短，临界流量越小。
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