1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. Shougang Research Institute of Technology, Shougang Group, Beijing 100041,China
Abstract:Deals with the influence of effective thermal conductivity on the results of heat transfer models of continuous casting. Heat transfer models can predict the surface temperature and solidification end accurately, but shell thickness of the earlier stage of solidification becomes thinner when thermal conductivity is large. On the other hand, the value of thermal conductivity affects the prediction of mushy zone greatly. When the thermal conductivity is larger, the liquid steel turn into the mushy zone earlier. Hence, the thickness of mushy zone is thicker, temperature gradient in the mushy zone is smaller, and local solidification time is longer. Changing convection equivalent factor[(m)]to fit the calculated number and measured number is practicable method to determine the value of m. As to casting machine, while setting[m=7]in the force convection area,[m=5]in the transition region of force convection and natural convection, [m=3]in the natural convection and[m=1]in the stagnant region, an exact modeling result can be obtained.
周 力,王新华,邓小旋,李林平,王万军. 关于连铸传热数学模型中等效导热系数的讨论[J]. 中国钢铁期刊网, 2015, 34(4): 18-23.
ZHOU Li,WANG Xin-Hua,DENG Xiao-xuan,LI Lin-ping,WANG Wan-jun. Discussion of effective thermal conductivity in heat transfer models of continuous casting. Chinese Journal of Iron and Steel, 2015, 34(4): 18-23.