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首页> 美国卫生研究院文献>Philosophical transactions. Series A Mathematical physical and engineering sciences >Thermoelectric magnetohydrodynamic effects on the crystal growth rate of undercooled Ni dendrites
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Thermoelectric magnetohydrodynamic effects on the crystal growth rate of undercooled Ni dendrites

机译：热电磁流体动力学对过冷镍枝晶晶体生长速率的影响

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摘要

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’.
机译：在纯金属的过冷凝固中，实验表明枝晶尖端速度对外部磁场强度有很强的依赖性，表现出几个最大值和最小值。在中国进行的实验中，使用玻璃熔剂法研究了纯镍的过冷凝固动力学。在高达6 T的不同静态场上比较了固化过程的可视化记录，通过热电磁流体动力学引入微观对流传输是观察到的尖端速度变化的有希望的解释。为了解决这个问题，使用了专用的数字代码来求解代表磁流体动力学，热学和凝固机理的耦合方程。潜在的现象可归因于两个相互竞争的流场，这两个流场是由磁场的正交分量产生的，平行于和垂直于生长方向。随着磁场强度的增加，它们的作用会增强或减弱，从而导致观察到的尖端速度行为。获得的结果很好地反映了实验结果。本文是主题主题“从原子界面到树枝状图案”的一部分。

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