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铸件凝固数值计算时高温液态金属热物理参数的选取是尚未解决的问题之一。本文在前人工作的基础上,将现场浇注(浇注圆柱形试样)与DFP参数优化结合起来,提出了一种液态金属有效导温系数α的实测方法。大量的实验与数值计算证实了该方法的可能性。有效导温系数α随液态金属温度的下降而减小。通过改变试样尺寸和浇注温度,探索了诸因素对液态金属有效导温系数的影响。
It is one of the unsolved problems to choose the physical parameters of high temperature liquid metal in solidification numerical calculation of castings. Based on the previous work, this paper combines the field pouring (pouring cylindrical specimen) with the optimization of DFP parameters, and presents a practical measurement method of effective temperature coefficient α of liquid metal. A large number of experiments and numerical calculations confirm the possibility of this method. The effective thermal conductivity coefficient α decreases as the temperature of the liquid metal decreases. By changing the sample size and pouring temperature, the influence of various factors on the effective temperature coefficient of liquid metal was explored.