Abstract:Argon blowing in tundish is a new technology for production of clean steel. By using the similar principles, a physical model of thinslab tundish with a certain scale was established in lab. Effects of weirdam combination, gas curtain instead of weir or dam on fluid flow characteristic were compared in detail. Meanwhile, an attempt that double gas curtains being used as substitute of weir or dam was carried out. The results indicate that, residence time and dead volume between gas curtain instead of weir or dam and traditional double dam was much similar. Besides that dead volume was a little more, residence time of double gas curtains instead of weir and dam was near that of traditional weirdam combination. The results above those can provide a good advice for farther application of gas curtains in tundish.