Mathematical model study on parameters of submerged nozzle in slab mould at high casting speed

The fluid field in slab mould was researched at different structure of submerged nozzle by mathematical model.The results indicate that the effect of nozzle outflow angle on fluid field is unobvious as a result of the molten steel hardly filling the outflow side hole and the weak guide flow effect for thin nozzle wall.When the area of side hole is small,the outflow velocity can be decreased by increasing area of side holes.As the side hole is hardly filled with molten steel,it is difficult to decrease outflow velocity by increasing hole area.When the hole is opened at the bottom of submerged nozzle,it is effective to receive approving fluid field for distributing flow from side hole at high casting speed.