Abstract: The flow behavior of the drained sand during the unsteady casting process was simulated by water model experiment, and the influence of the liquid level, the length of the long nozzle, the flowrate of lable, and the influence of the flow control device on the slag entrapment were studied respectively. The results show that the removal rate of sand was highest in the process of ladle changing when the optimum liquid surface height is 450 mm, and the optimum nozzle length is 180 mm,and the minimum lable flowrate is 6 m3/h. The reasonable flow control device can increase the removal rate of the drainage sand.

Key words: drainage sand, ladle changing, unsteady state, slag entrapment