Model Study on the Entrapment of Mold Powder into Molten Steel
Model Study on the Entrapment of Mold Powder into Molten Steel
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DOI：
10.2355/isijinternational.40.685
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发表时间：
2000-07
影响因子：
1.8
通讯作者：
M. Iguchi;J. Yoshida;Tomoyuki Shimizu;Yoshiteru Mizuno
中科院分区：
文献类型：
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作者：
M. Iguchi;J. Yoshida;Tomoyuki Shimizu;Yoshiteru Mizuno
在钢的连续铸造模具中，保护渣被放置在熔融钢的弯月面上，以防止弯月面的热损失，并将其用作凝固钢和模具之间的润滑剂。结晶器保护渣有时会混入钢水中。这样的保护渣夹带显著影响钢产品的质量。在这项研究中，我们专注于钢液流和保护渣之间的剪切流动不稳定性作为保护渣卷包的原因之一，并研究了保护渣的运动粘度对卷包开始的影响。用盐水和几种硅油进行了模型实验。采用基于互相关法的粒子成像测速仪（PIV）测量了硅油-盐水界面附近的流速。硅油的运动粘度几乎不影响Kelvin-Helmholtz不稳定性引起的结晶器保护渣卷入的临界流速，但它影响不稳定性的波长。
In continuous casting molds of steel, mold powder is placed on the meniscus of molten steel in order to prevent heat loss from the meniscus and to use it as a lubricant between the solidifying steel and the mold. The mold powder is sometimes entrapped into the molten steel. Such mold powder entrapment affects the quality of the steel product significantly. In this study we focused on the shear flow instability between the molten steel flow and mold powder as one of causes for the mold powder entrapment and investigated the effect of the kinematic viscosity of the mold powder on the onset of the entrapment. Model experiments were carried out using salt water and some kinds of silicone oils. The velocity of flow around an interface between the silicone oil and salt water was measured with a particle imaging velocimetry (PIV) based on the cross-correlation method. The kinematic viscosity of silicone oil hardly affected the critical flow velocity for the onset of the mold powder entrapment caused by Kelvin-Helmholtz instability, but it affected the wave length of the instability.