钢锭凝固过程中锭模温度及换热系数变化的数值模拟.pdfVIP

钢锭凝固过程中锭模温度及换热系数变化的数值 模拟 李志强 周建安 (武汉科技大学材料与冶金学院，武汉 430081) 摘要 假设钢锭凝固过程中钢锭-锭模边界以辐射换热为主而锭模外侧壁边界同时考虑辐射和对流换热，通过自建模型模拟 研究了钢锭凝固过程中钢锭和锭模的温度场变化及锭模内外表面温度和换热系数的变化。结果表明，在钢锭凝固过程中，模 壁及底座附近钢液(锭)的温度变化较快，冒口处钢液(锭)温度变化较慢。钢锭-锭模换热系数、锭模内外表面温度和锭模外 2 表面与空气的对流换热系数均随其对应位置高度的升高而增大，数值分别为 150～600 W/(m ·K)、410～1740K、500~1050K 2 和20~90 W/(m ·K)。 关键词 钢锭凝固 锭模边界温度 锭模边界换热系数 数值模拟 Numerical Simulation of Temperature and Heat Transfer Coefficient Changes of Mould in Ingot Solidification Process Li Zhiqiang Zhou Jianan (School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China) Abstract During the solidification process, the temperature changes of the ingot and mould and the temperature and heat transfer coefficient changes inside and outside the mould were simulated through a selfdesigned modle on the assumptions that the heat transfer way with the ingot-mould boundary was radiation and the heat transfer way between the mould and air were radiation and convection. The results showed that, during the solidification process, the temperature changes of steel ingot nearby the basis and wall of mould were fast while the temperature change of steel ingot nearby the raiser was slow. All of the heat transfer coefficient, the temperature inside and outside the mould and the heat transfer coefficient between the mould and air increased with the height 2 2 increase of the reference point, and the ranges were 150～600 W/(m ·K), 410 ～1740K, 500~1050K and 20~90