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Multiparticle Interfacial Drag in Equiaxed Solidification

机译:等轴凝固中的多颗粒界面阻力

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摘要

A physical model is proposed for the solid/liquid interfacial drag in both globular and dendritic equiaxed solidification. By accounting for the presence of multiple particles and the non-sphericity and porosity of the individual equiaxed crystals, a drag correlation is developed, which is valid over the full range of solid volume fractions. It is shown that neither the solid liquid interfacial area concentration nor the grain size alone is adequate to characterize the interfacial drag for equiaxed dendritic crystals in both the free particle and packed bed regimes; thus, the present model is based on a multiple length scale approach. The model predictions are compared to previous analytical and numerical results as well as to experimental data available in the literature, and favorable agreement is achieved.
机译:针对球状和树状等轴凝固中的固/液界面阻力,提出了一个物理模型。通过考虑多个颗粒的存在以及各个等轴晶体的非球形性和孔隙率,开发了一种阻力相关性,它在固体体积分数的整个范围内都是有效的。结果表明,无论是在自由颗粒状态还是在填充床状态下,固液界面面积浓度和晶粒尺寸都不足以表征等轴枝晶的界面阻力。因此,本模型基于多长度尺度方法。将模型预测与先前的分析和数值结果以及文献中提供的实验数据进行比较,并取得了良好的共识。

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