Effect of EMBr on fluid flow,heat transfer and inclusion removing during CC
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摘要: 采用數值模擬方法研究了不同磁感應強度下電磁制動(EMBr)對某鋼廠結晶器流場、傳熱以及夾雜物去除的影響.結果表明采用電磁制動,結晶器內流體的表面流速增加,對窄面沖擊深度減少,結晶器自由表面溫度升高,高溫區上移而且范圍擴大.隨著磁感應強度增加,自由液面溫度提高2~5℃,這有助于保護渣的熔化,可改善彎月面的鋼液流動特性.夾雜物尺寸越大,越容易為結晶器液面所吸收去除,對于尺寸大于30μm的夾雜物,磁感應強度越大,夾雜物越容易被結晶器保護渣所吸收.Abstract: A computational fluid flow model was applied to investigate the effects of electromagnetic brake (EMBr) field strength on flow in the mold cavity. The three-dimensional, steady k-ε model of the nozzle and liquid cavity in the mold applied for the magnetic induction method in FLUENT to add the localized-type static EMBr field which was measured at a steel plant. The 3-D fluid flow, heat transfer, and inclusion removing on top free surface in a continuous casting strand with EMBr were investigated. It is found that EMBr effectively slows the speed of molten steel exiting from the nozzle outlet, reduces impingement impact of the jet on the narrow face, and shortens the penetration depth of the lower recirculation zone. It is also helpful to increase the temperature of molten mold flux at the meniscus by 2-5℃. Larger inclusions are easy to be entrapped by mold slag. The inclusion removing fraction increases with an increase in magnetic field strength when the diameters of inclusions exceed 30 μm.
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Key words:
- electromagnetic brake (EMBr) /
- fluid flow /
- heat transfer /
- inclusion removing
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