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首页> 外文期刊>International Journal of Heat and Mass Transfer >Growth direction selection of tilted dendritic arrays in directional solidification over a wide range of pulling velocity: A phase-field study
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Growth direction selection of tilted dendritic arrays in directional solidification over a wide range of pulling velocity: A phase-field study

机译：在广泛的拉速范围内定向凝固过程中倾斜枝晶阵列的生长方向选择：一个相场研究

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摘要

In this paper, the growth direction selection of tilted dendritic arrays in directional solidification over a wide range of pulling velocity was investigated by using a thin-interface phase-field model. A systematic convergence study with respect to the interface width for various pulling velocities was first carried out to keep simulated results that are independent of interface width. In our simulations, all data points effectively collapse to the DGP (Deschamps, Georgelin, and Pocheau) law (Phys Rev E 78 (2008) 011605-1-13) for lower pulling velocities while numerical results departure from the DGP law for higher pulling velocity. Based on the data from phase-field simulations, we discussed the dependence of the coefficients/and g in DGP law on μ (μ~ (*) V_p/V_c) for a fixed misorientation angle. The dendritic tip shapes of tilted and non-tilted dendrites were compared, and the evolution of tip radius with the variation of V_p was studied. Then, we discuss the reason why our numerical results departure from the DGP law for larger pulling velocities based on the variation of dendritic tip radius with the increase of the pulling velocity for a given Peclet number.
机译：本文利用薄界面相场模型研究了倾斜枝晶阵列在大范围拉伸速度下定向凝固生长方向的选择。首先进行了关于各种拉动速度的界面宽度的系统收敛研究，以保持模拟结果与界面宽度无关。在我们的模拟中，所有数据点有效地塌陷为DGP（Deschamps，Georgelin和Pocheau）定律（Phys Rev E 78（2008）011605-1-13），以降低牵引速度，而数值结果则偏离DGP规律以实现较高牵引力速度。基于相场仿真的数据，我们讨论了DGP定律中系数/和g对固定取向差角的μ（μ〜（*）V_p / V_c）的依赖性。比较了倾斜和非倾斜树突的树突尖端形状，研究了尖端半径随V_p变化的变化。然后，我们讨论了在给定的Peclet数下，随着枝晶尖端半径随牵拉速度的增加而变化的情况，我们的数值结果偏离DGP定律而导致更大的牵伸速度的原因。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第2期|1107-1114|共8页
  • 作者

    Hui Xing; Kumar Ankit; Xianglei Dong; Huimin Chen; Kexin Jin;

  • 作者单位

    The Key Laboratory of Space Applied Physics and Chemistry. Northwestern Polytechnical University, 710129 Xi'an, PR China;

    Materials Science and Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, United States;

    The Key Laboratory of Space Applied Physics and Chemistry. Northwestern Polytechnical University, 710129 Xi'an, PR China;

    The Key Laboratory of Space Applied Physics and Chemistry. Northwestern Polytechnical University, 710129 Xi'an, PR China;

    The Key Laboratory of Space Applied Physics and Chemistry. Northwestern Polytechnical University, 710129 Xi'an, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Directional solidification; Dendritic growth; Phase-field simulations;

    机译：定向凝固;树突生长;相场模拟;

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