The Role of Nozzle-Port Geometry on Flux Entrainment in Slab Molds
Stability of metal-flux interface is affected mainly by the casting speed,mold width,steel and flux chemistries and nozzleport geometry.Maintaining constant all other mold operating factors,port geometry plays the most important role to attain a stable interface.Fluid flow through the ports dictates the performance of a nozzle for casting all the spectrum of slab mold widths in a given caster.In this work,various port geometries were tested.The root of flux entrainment is the generation of velocity spikes which are difficult to identify even through the statistical analysis of turbulent fluid flow data of steel in the mold.Through physical modeling,theoretical considerations,dimensional analysis and mathematical simulations the generation of velocity spikes at the interface are identified in this work.On the other hand,a critical capillary number for flux entrainment onset is compared with capillary numbers calculated using the velocity spikes.Whenever the magnitudes of these capillary numbers exceed the critical one the flux entrainment existence will be predicted.Therefore,by the number of spikes per minute and their magnitude it is possible to assess the performance of a nozzle making possible the link between steel chemistry,flux chemistry,mold width and nozzle design.
R.D. MORALES Ismael-Calderón-RAMOS María M. Salazar-CAMPOY
Department of Metallurgy and Materials Engineering,Instituto Politécnico Nacional-ESIQIE,Ed.7 UPALM, Department of Metallurgy and Materials Engineering,Instituto Politécnico Nacional-ESIQIE,Ed.7 UPALM,
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
465-468
2015-05-12(万方平台首次上网日期,不代表论文的发表时间)