Physical and numerical characterization of the near-eutectic permeability of aluminum–copper alloys
Physical and numerical characterization of the near-eutectic permeability of aluminum–copper alloys
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DOI：
10.1016/j.actamat.2010.07.055
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发表时间：
2010-11
期刊：
影响因子：
9.4
通讯作者：
E. Khajeh;D. Maijer
中科院分区：
文献类型：
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作者：
E. Khajeh;D. Maijer
通过物理和数值模拟确定了铝铜合金近共晶磁导率。物理模型是由X射线显微断层扫描获得的三维（3-D）几何形状的快速原型技术产生的枝晶间结构的大规模模拟物。使基于甘油的溶液通过物理模型，并根据排出流速和压降的测量值计算渗透率。数学模型，考虑连续性和动量方程，开发了相应的非结构网格的三维几何形状的物理模型。渗透率的数值计算值与实测值吻合较好。借助于这种3-D表征，可以区分在高固体分数下普遍存在的孤立液体区域和有助于枝晶间流动的那些液体通道。在这项研究中提出的工作突出了注意，必须支付的数值计算中的糊状区的流体流动，并提出了一种替代技术，以确定渗透率相比，传统的渗透仪。
The near-eutectic permeability of aluminum–copper alloys has been determined through physical and numerical modeling. The physical models are large-scale analogues of interdendritic structures produced by a rapid prototyping technique from three-dimensional (3-D) geometries obtained by X-ray microtomography. A glycerin-based solution was passed through the physical models and the permeability was calculated from measurements of the discharge flow rate and pressure drop. Mathematical models, considering the continuity and momentum equations, were developed for the corresponding unstructured meshes of the 3-D geometries used for the physical models. The numerically determined values of permeability are in good agreement with those measured. With the aid of this 3-D characterization, it is possible to distinguish between isolated liquid regions that are prevalent at high solid fractions and those liquid channels that contribute to interdendritic flow. The work presented in this study highlights the attention that must be paid to numerical calculations of fluid flow in the mushy zone and presents an alternative technique to determine permeability compared to conventional permeameters.