Thermoelectric magnetohydrodynamic effects on the crystal growth rate of undercooled Ni dendrites.
Thermoelectric magnetohydrodynamic effects on the crystal growth rate of undercooled Ni dendrites.
复制标题
热电磁流体动力学对底冷Ni树突的晶体生长速率的影响。
DOI：
10.1098/rsta.2017.0206
复制
发表时间：
2018-02-28
期刊：
影响因子：
--
通讯作者：
Pericleous K
中科院分区：
文献类型：
--
作者：
Kao A;Gao J;Pericleous K
在纯金属的过冷凝固过程中，实验表明枝晶尖端速度强烈依赖于外加磁场的强度，呈现出几个极大值和极小值。在中国的实验中，用玻璃熔剂法研究了纯镍的过冷凝固动力学。比较了6 T以下不同静电场下凝固过程的可视化记录。通过热电磁流体力学引入微观对流输运可以很好地解释观察到的尖端速度变化。为解决这一问题，使用专门设计的数值程序来求解表示磁流体力学、热学和凝固机理的耦合方程。潜在的现象可以归因于两个相互竞争的流场，它们是由平行和横向于生长方向的磁场的正交分量产生的。它们的影响要么随着磁场强度的增加而增强，要么随着磁场强度的增加而减弱，从而导致观察到的尖端速度行为。所得结果很好地反映了实验结果。这篇文章是“从原子界面到树枝状模式”主题的一部分。
In the undercooled solidification of pure metals, the dendrite tip velocity has been shown experimentally to have a strong dependence on the intensity of an external magnetic field, exhibiting several maxima and minima. In the experiments conducted in China, the undercooled solidification dynamics of pure Ni was studied using the glass fluxing method. Visual recordings of the progress of solidification are compared at different static fields up to 6 T. The introduction of microscopic convective transport through thermoelectric magnetohydrodynamics is a promising explanation for the observed changes of tip velocities. To address this problem, a purpose-built numerical code was used to solve the coupled equations representing the magnetohydrodynamic, thermal and solidification mechanisms. The underlying phenomena can be attributed to two competing flow fields, which were generated by orthogonal components of the magnetic field, parallel and transverse to the direction of growth. Their effects are either intensified or damped out with increasing magnetic field intensity, leading to the observed behaviour of the tip velocity. The results obtained reflect well the experimental findings. This article is part of the theme issue ‘From atomistic interfaces to dendritic patterns’.
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DOI：
10.1016/0001-6160(87)90174-x
发表时间：
1987-04-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
LIPTON, J;KURZ, W;TRIVEDI, R
通讯作者：
TRIVEDI, R
影响因子：
1.8
作者：
Gao, Jianrong;Kao, Andrew;Alexandrov, Dmitri V.
通讯作者：
Alexandrov, Dmitri V.
影响因子：
1.8
作者：
Funke, O.;Phanikumar, G.;Herlach, D. M.
通讯作者：
Herlach, D. M.
影响因子：
3.7
作者：
SHERCLIFF, JA
通讯作者：
SHERCLIFF, JA
影响因子：
1.8
作者：
Bojarevics, V;Pericleous, K
通讯作者：
Pericleous, K