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首页> 美国卫生研究院文献>Materials >Meniscus of a Magnetic Fluid in the Field of a Current-Carrying Wire: Three-Dimensional Numerical Simulations
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Meniscus of a Magnetic Fluid in the Field of a Current-Carrying Wire: Three-Dimensional Numerical Simulations

机译：载流导线磁场中的弯液面：三维数值模拟

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摘要

Three-dimensional calculations of the meniscus of a magnetic fluid placed around a current carrying vertical and cylindrical wire are presented. Based on the material properties of experimentally used magnetic fluids, the numerically determined menisci are compared with the experimentally measured ones reported by May. The comparison is made for a linear law of magnetisation as well as for the experimentally measured nonlinear magnetisation curve. Up to moderate strengths of the applied current ( A), i.e., up to moderate strengths of the magnetic field close to the wire, the calculated profiles agree satisfyingly with the experimentally measured ones for a linear as well as for a nonlinear law of magnetisation. At a great strength of the applied current ( A), i.e., at a large strength of the magnetic field close to the wire, the agreement is less good than in the range up to moderate strengths. Our analysis revealed that the numerically assumed isothermal conditions are not present in the experiment, particularly at the great strength of the applied current. A control of the temperature in the experiment and the implementation of a coupled thermal model in the numerics are considered the most relevant future steps for an improved agreement.
机译：提出了绕载有垂直和圆柱形导线的电流周围的磁流体弯月面的三维计算。根据实验使用的磁性流体的材料特性，将数值确定的弯月面与May报道的实验测量的弯月面进行了比较。进行磁化的线性定律和实验测量的非线性磁化曲线的比较。高达中等强度的施加电流（A），即高达中等强度的靠近导线的磁场，对于线性和非线性磁化定律，计算出的轮廓与实验测得的轮廓令人满意。在所施加的电流（A）的强度大时，即在靠近导线的磁场的强度大时，该一致性不如在中等强度的范围内好。我们的分析表明，在实验中不存在数值假定的等温条件，特别是在施加的电流强度较大时。实验中的温度控制和数字中耦合热模型的实现被认为是改进协议最相关的未来步骤。

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