The effect of shear flow on the dendritic characteristics

The effect of shear flow on the dendritic characteristics
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剪切流对枝晶特性的影响

DOI:
10.1016/j.matlet.2011.05.009
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发表时间:
2011-08
期刊:
影响因子:
3
通讯作者:
Changli Chen
Changli Chen
中科院分区:
材料科学3区
文献类型:
--
作者:
Jianyuan Wang;Wei Zhai;Kexin Jin;Changli Chen

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对透明丁二腈(SCN)-3.5wt.%H2O合金在剪切流作用下的定向枝晶生长进行了原位观察。在宽流量(U)和拉速(V)条件下,定量测量了枝晶生长倾角、一次臂间距和枝晶尖端半径等枝晶特征的变化。实验数据表明,向上游倾斜的角度与(U/V)0.6成正比。这可能是由于枝晶生长过程主要受横向和法向溶质扩散竞争的影响。在此基础上,提出了描述枝晶尺度、剪切流量和拉力速率之间关系的数学模型,该模型与实验数据吻合较好。
Directional dendritic growth of transparent succinonitrile (SCN)–3.5wt.% H2O alloy in the presence of shear flow is in-situ observed. The variation of dendritic characteristics, including growth tilting angle, primary arms spacing, and dendrite tip radius are quantitatively measured in wide flow rate (U) and pulling rate (V) regimes. The experimental data show that, the titling angle towards the upstream side is in proportional to (U/V)0.6. This could be explained by the reason that the dendritic growth process is mainly influenced by the solute diffusion competition between lateral direction and normal direction. Based on this, a mathematic model, which agrees well with the experimental data, is proposed to describe the correlation among the dendritic scales, shear flow rate and pulling rate.
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