Numerical Simulation of Dendritic Growth in Solidification of Binary Alloy with Forced Convection

Lü Donglan; Long Wenyuan; Xia Chun; Pan Meiman; Wan Hong

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Numerical Simulation of Dendritic Growth in Solidification of Binary Alloy with Forced Convection
Vol. 29, Issue 11, Pages: 1012-1015(2009)
Published： 2009 ，
DOI：

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[1]吕冬兰,龙文元,夏春,潘美满,万红.强迫对流影响合金凝固过程枝晶生长的数值模拟[J].特种铸造及有色合金,2009,29(11):1012-1015+975-976.

Lü Donglan, Long Wenyuan, Xia Chun, et al. Numerical Simulation of Dendritic Growth in Solidification of Binary Alloy with Forced Convection. [J]. Special Casting & Nonferrous Alloys 29(11):1012-1015(2009)
[1]吕冬兰,龙文元,夏春,潘美满,万红.强迫对流影响合金凝固过程枝晶生长的数值模拟[J].特种铸造及有色合金,2009,29(11):1012-1015+975-976. DOI：

Lü Donglan, Long Wenyuan, Xia Chun, et al. Numerical Simulation of Dendritic Growth in Solidification of Binary Alloy with Forced Convection. [J]. Special Casting & Nonferrous Alloys 29(11):1012-1015(2009) DOI：

摘要

利用耦合溶质场与流场的相场模型

对Al-2.5Cu合金等温凝固时枝晶生长过程进行了模拟。研究了强迫对流、扰动强度及各向异性强度对枝晶生长形貌的影响。结果表明

在流场作用下

枝晶呈非对称性生长

上游的生长速度大于下游;对流影响溶质场的分布

将溶质从上游冲刷到下游

使得上游液相中的浓度低于下游;扰动强度越大

诱发的侧向分枝越多

二次枝晶越发达;各向异性强度越大

枝晶尖端的生长速度越快

曲率半径越小。

Abstract

Dendritic growth in Al-2.5Cu alloy during isothermal solidification was simulated by phase field model coupling solute field with flow field to understand effects of forced convection

noise intensity and anisotropic on dendritic morphology.The results indicate that dendrite is grown asymmetrically in condition of forced convection

where the growth velocity of upstream dendrite is faster than that of downstream dendrite.Due to the effects of convection

the solute will be washed from upstream to downstream

resulting in the upstream concentration lower than the downstream one in the liquid alloy.With increasing in noise intensity

secondary dendrite arm in upstream direction becomes more and more developed as a result of the increase of lateral branch.Meanwhile

with rising in anisotropic value

the growth velocity of dendritic tip is promoted with decreasing in curvature radius.

关键词

相场法强迫对流各向异性扰动强度

Keywords

Phase Field MethodForced ConvectionAnisotropicNoise Intensity

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Optimization of Parameters Related to Dendritic Growth in Pure Metal by Phase-field Method

Modeling of Non-isothermal Dendrite Growth in Pb-Sn Alloy

Simulation of Effects of Phase-field Parameters on Dendritic Growth in a Forced Flow

Effects of Phase Field Parameters on Dendritic Growth in Isothermal Binary Alloy with a Forced Convection