In the current study, the transient fluid flow pattern in steel continuous casting molds with varied dimensions was evaluated using nail board measurement and onsite top flux observation. Effects of steel throughput, argon flow rate, submergence depth of the submerged entry nozzle, and mold dimension on the flow pattern inside the mold were investigated. The top flux under lower steel throughput, higher gas flow rate, and shallower submergence depth of the submerged entry nozzle were easily swept away by argon bubbles so that the molten steel was exposed to the air, called exposed eyes. Linear fitting equations between the steel throughput and the gas volume percentage for the transient flow pattern were performed. The critical linear relationships of the double roll flow pattern transformed to the complex flow, and the complex flow transformed to the single roll flow pattern. Flow pattern regimes were plotted with the results of the industrial measurements. The present work aimed at providing an operating interval of the steel throughput and the gas volume percentage to maintain the double roll flow pattern inside the mold for the regular casting practice.

在当前的研究中，使用钉板测量和现场顶部通量观察评估了尺寸不同的钢质连铸结晶器中的瞬态流体流动模式。研究了钢产量，氩气流量，浸入式水口的浸入深度和铸型尺寸对铸型内部流型的影响。较低的钢通过量，较高的气体流速和较浅的浸入式喷嘴的浸入深度下的顶部焊剂很容易被氩气气泡吹走，从而使钢水暴露在空气中，称为裸眼。对于瞬态流型，在钢产量和气体体积百分比之间进行了线性拟合方程。将双辊流模式转换为复数流的临界线性关系，复杂的流动转化为单辊流动模式。用工业测量的结果绘制了流型图。当前的工作旨在提供钢产量和气体体积百分比的操作间隔，以在常规铸造实践中保持模具内部的双辊流型。