Numerical simulation of electromagnetic stirring in secondary cooling zone of extra-thick slab continuous casting
The mode of electromagnetic stirring can alter the distribution of the magnetic field within the mol-ten steel,as well as influence the flow pattern of the liquid steel within the slab,which in turn affects the slab's shell distribution.Numerical simulation methods were utilized to chart the effects of different electro-magnetic stirring modes on the internal fluid dynamics of the slab during the secondary cooling phase for extra-thick slabs.The findings indicate that the location where vortex flow is generated varies depending on the stir-ring method used.In both the double-disc and double-ring modes,vortex flow appears near the lower bound-ary of the slab,whereas in the tri-ring mode,it occurs at the location of the stirring roller.In terms of casting speed,the tri-ring mode shows the least sensitivity,with the variation in average speed between casting speeds of 0.5 m/min and 0.7 m/min being a mere 0.005 m/s.Upon a comprehensive comparison of the three stirring modes,it becomes evident that the overall fluid field distribution is most balanced in the tri-ring mode.Furthermore,as the distance between the stirring rollers widens,the uppermost and lowermost areas of the vortex produced by stirring tend to decrease,while the middle vortex experiences a corresponding increase.
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