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首页> 外文期刊>Metallurgical and Materials Transactions B >Modeling of the Equiaxed Dendrite Coarsening Based on the Interdendritic Liquid Permeability during Alloy Solidification
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Modeling of the Equiaxed Dendrite Coarsening Based on the Interdendritic Liquid Permeability during Alloy Solidification

机译：基于合金凝固过程中枝晶间渗透率的等轴枝晶粗化建模

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摘要

In this investigation, a model has been developed for determination of liquid flow permeability through dendritic structures during equiaxed dendrite growth. Two separate computational models have been coupled for modeling the permeability and coarsening in mushy alloys. The dendrite growth has been simulated using a cellular automation finite difference analysis, while the fluid flow has been modeled employing computational fluid dynamic. A new approach has also been proposed in calculation of the coarsening phenomenon as well as modification of the micro fluid flow based on switching between permeability and pressure gradients at high solid fractions. The predictions show that in high solid fractions, an iterated algorithm on the permeability gradient at a given pressure is closer to the experimental results. Therefore, under these circumstances, the continuity equation would not be satisfied by prediction and correction of the pressure field. Instead, the continuity equation would be satisfied by iteration and correction of the local permeability at a constant pressure gradient.
机译：在这项研究中，已经开发出一种模型，用于确定等轴枝晶生长过程中通过树突结构的液体渗透率。耦合了两个单独的计算模型，以对糊状合金的渗透性和粗化进行建模。枝晶生长已使用细胞自动化有限差分分析进行了模拟，而流体流动已使用计算流体动力学进行了建模。还提出了一种新方法，用于计算粗化现象以及基于在高固相分率下渗透率和压力梯度之间的切换来改变微流体流量。预测表明，在高固含量下，在给定压力下渗透率梯度的迭代算法更接近实验结果。因此，在这种情况下，压力场的预测和校正将无法满足连续性方程。取而代之的是，连续性方程将通过在恒定压力梯度下对局部渗透率的迭代和校正来满足。

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