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首页> 外文期刊>Journal of Crystal Growth >Control of solidification of non-conducting materials using tailored magnetic fields
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Control of solidification of non-conducting materials using tailored magnetic fields

机译：使用量身定制的磁场控制非导电材料的凝固

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The structure of fluid flow in a solidifying melt plays a critical role in the quality/properties of the solid. It follows that by controlling the flow behavior, the final solidified material can be suitably affected. Most of the magnetic control approaches used depend on the variation of the Lorentz force for suppression of flow and are limited to conducting materials alone. The application of a magnetic gradient gives rise to an additional force that can be used to affect the melt flow of any material. In this work, a computational method for the design of solidification of a non-conducting material is addressed such that diffusion-dominated growth is achieved by the suppression of convection. The control parameter in the design problem is the time history of the imposed magnetic field. The design problem is posed as an unconstrained optimization problem. The adjoint method for the inverse design of continuum processes is adopted. Examples of designing the time history of the imposed magnetic field for the directional growth of various nonconducting materials are presented to demonstrate the developed formulation.
机译：凝固熔体中的流体流动结构在固体的质量/性质中起着至关重要的作用。因此，通过控制流动行为，可以适当地影响最终的固化材料。所使用的大多数磁控制方法取决于洛伦兹力的变化以抑制流动，并且仅限于单独传导材料。磁梯度的施加会产生附加力，该附加力可用于影响任何材料的熔体流动。在这项工作中，解决了一种用于设计非导电材料凝固的计算方法，从而通过抑制对流来实现扩散为主的生长。设计问题中的控制参数是施加的磁场的时间历史。设计问题被认为是无约束的优化问题。连续过程逆设计采用了伴随法。给出了设计用于各种非导电材料定向生长的外加磁场时间历史的示例，以证明开发的配方。

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