Impact of slag layer on macroscopic flow inside tundish and velocity near slag-steel interface
The impact of the slag layer on internal macroscopic flow in tundish is frequently neglected,and there is little research on the velocity beneath the tundish slag-steel interface.This study focuses on a single-strand tundish without flow control devices.Ink and salt tracer solution were used to systematically study the macroscopic flow phenomena in a water model tundish.Particle image velocimetry(PIV)technology was utilized to measure the velocity distribution beneath the water-oil interface and internal region of the tundish.The primary objective is to investigate the influence of the oil layer on the macroscopic flow within the tundish and the flow field at the water-oil interface.The results show that in scheme of presence of the oil layer,the transport and diffusion of the tracer at the bottom of the tundish are facilitated,and the ink transfer process at the water-oil interface is slowed down.In the scheme without the oil layer,there is an obvious trend of ink upward transport,while in the scheme with the oil layer,ink primarily transports along the bottom.Compared to the scheme without the oil layer,the time for ink flow out from the outlet is reduced.For the salt tracer transport experiment,the residence time distribution(RTD)curve of the silicone oil scheme exhibits a leftward shift compared to the RTD curve of the free of oil scheme,indicating an expedited outflow of the salt tracer solution from the tundish outlet.In the scheme without the oil layer,the flow velocity near the liquid surface is generally greater than that in the scheme with the oil layer.In the area near the outlet and right wall,in some locations the velocity in the scheme with oil layer is slightly greater than that of the scheme without oil layer.In this case,the blocking effect of the oil layer on the fluid becomes weaker.Furthermore,for the oil layer scheme,the vertical velocity attains its maximum value in the vicinity of the ladle shroud area,the vertical velocity increases with increasing distance from the water-oil interface.In the region proximal to the right-side wall,the horizontal velocity attains its peak,albeit exhibiting minimal variation with the liquid surface height.
single-strand tundishwater modelslag-steel interfacePIVvelocity field