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首页> 外文期刊>International Journal of Heat and Mass Transfer >EFFECT OF WALL ELECTRICAL CONDUCTIVITY AND MAGNETIC FIELD ORIENTATION ON LIQUID METAL FLOW IN A GEOMETRY SIMILAR TO THE HORIZONTAL BRIDGMAN CONFIGURATION FOR CRYSTAL GROWTH
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EFFECT OF WALL ELECTRICAL CONDUCTIVITY AND MAGNETIC FIELD ORIENTATION ON LIQUID METAL FLOW IN A GEOMETRY SIMILAR TO THE HORIZONTAL BRIDGMAN CONFIGURATION FOR CRYSTAL GROWTH

机译：壁电导率和磁场取向对类似于水平布里奇曼晶体生长的几何形状中液态金属流动的影响

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The article deals with magnetic field damping of free-convective flows in cavities similar to those used in artificial growth of single crystals from melts (horizontal Bridgman configurations) and having aspect ratios A equal to 1 or 4. The combined effect of wall electrical conductivity and direction of the magnetic field on the buoyancy-induced flow of gallium was investigated numerically. The validation of the numerical method was achieved by comparison with both experimental and analytical data found in the literature. The plotted results for variation of velocity, temperature and Nusselt number in terms of the Hartmann number Ha and Rayleigh number Ra showed a considerable decrease in convection intensity as the magnetic field is increased, especially for values of Ra situatied around 10~5. The calculations also showed that the horizontally directed magnetic field (perpendicular to the y-z plane)is the most effective in controlling the flow and hence the speed of growth of the crystal and its composition in dopants. Also, wall electrical conductivity enhances damping by changing the distribution of the induced electric current to one which augments the magnitude of the Lorentz force in regions where it acts as a sink and diminishing it in the remaining parts of the cavity.
机译：该文章涉及腔中自由对流流动的磁场阻尼，类似于从熔体中人工生长单晶（水平布里奇曼构型），纵横比A等于1或4。壁电导率和数值研究了磁场在浮力诱导的镓流动中的方向。通过与文献中发现的实验数据和分析数据进行比较，可以验证数值方法的有效性。根据哈特曼数Ha和瑞利数Ra绘制的速度，温度和Nusselt数变化的绘制结果显示，随着磁场的增加，对流强度显着下降，特别是当Ra值位于10〜5左右时。计算还表明，水平方向的磁场（垂直于y-z平面）在控制流量方面最有效，因此在控制掺杂剂中晶体及其成分的生长速度方面最有效。而且，壁电导率通过将感应电流的分布改变为一个增大了洛伦兹力的大小的区域来增强阻尼，在该区域中，洛伦兹力起吸收作用，并在空腔的其余部分中减小。

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