발간논문

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Vol.36, No.11, 1796 ~ 1807, 1998
Title
Three Dimensional Numerical Analyses for the Transport Phenomena in the Molten Pool of Twin Roll Strip Caster
정형태 , 김완수 , 강태욱 Hyung Tae Chung , Wan Soo Kim , Tae Wook Kang
Abstract
Three-dimensional numerical analyses were performed to simulate the transport phenomena far the heat transfer and fluid flow in the molten pool formed by a bifurcated round submerged entry nozzle(SEN) in twin roll strip casting process. From the point of skull formation at the free surface, or meniscus, the submerged depth of 80 ㎜ was preferred to that of 150 ㎜. The skull formation in the vicinity of edge dam and around the nozzle could be minimized when the outlet of the nozzle was declined at 16 degrees with the nozzle submerged by 80 ㎜. The region up to about 200 ㎜ from the nip remained in mushy state : the cooler melt was being squeezed upwards from the nip while the hotter melt from the nozzle could not reach down to that region. In the vicinity of edge dam, the squeezing was more severe than in the center of the width, and the hotter melt from the nozzle was pushed upwards. This kind of flow pattern could promote the skull formation near the edge dam. Solidified shell thickness was thinner in the edge dam regions than any other regions, but was thicker near the nozzle close to free surface. Nonuniformities of solidified shell thickness which were formed at the initial stage of solidification remained during the solidifying process.
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