Research on Fluid Flow, Heat Transfer With Solidification, Inclusion Movement in Bloom Mold With Electromagnetic Brake

摘要

Bloom continuous casting mold with electromagnetic brake (EMBR) can weaken the downward impinging jet and promote inclusion flotation when using one-port nozzle, or can weaken the jet from the side-port to avoid solidified shell erosion on narrow face when using two-port nozzle. This paper set a coupled mathematical model including fluid flow, heat transfer with solidification, inclusion movement and electromagnetic field in bloom mold, based on which the flow and heat transfer of liquid steel and inclusion removal with or without EMBR were investigated and compared. Results show that for one-port nozzle, EMBR can decrease the impinging jet depth obviously, promote the transverse spread of jet flow, make the temperature distribution in mold more uniform and increase the fluid superheat near meniscus. Moreover, for one-port nozzle, EMBR increases the shell surface temperature and decreases the shell thickness in the mold, but enhances the inclusion removal rate more than one time. For two-port nozzle, EMBR can decrease the jet impingement on narrow face and increase the shell thickness there. As the same to one-port nozzle, EMBR also makes the fluid superheat spread in the whole mold and increases the superheat near meniscus for two-port nozzle. Besides, EMBR can decrease the shell temperature and increase the shell thickness in narrow face but on the contrary way in wide face, and these is no obvious increase for inclusion removal rate by using EMBR for two-port nozzle.