Electromagnetic force on a magnetic dipole inside an annular pipe flow
Electromagnetic force on a magnetic dipole inside an annular pipe flow
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DOI：
10.1063/1.4820239
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发表时间：
2013-09
影响因子：
4.6
通讯作者：
C. Heinicke;A. Thess
中科院分区：
文献类型：
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作者：
C. Heinicke;A. Thess
我们提出了一个液态金属电磁流量测量的启发性例子，该例子易于分析，但与实验室实验显示出非常好的一致性。我们的系统包括一个位于环形管道内的小型永磁体，该环形管道承载液体金属流。我们调查的洛伦兹力作用在磁铁上使用的实验室实验与液体金属在室温下和一个简单的分析模型相结合。我们表明，测量的洛伦兹力与我们的模型在很宽的几何参数范围内的预测是非常好的协议。凭借其简单性和密切的关系，众所周知的“蠕动磁铁”的课堂实验，我们的系统也可以作为一个教育工具，在液体金属磁流体力学入门课程。
We present an illuminating example of electromagnetic flow measurement in liquid metals that is easy to analyze yet displays a remarkably good agreement with laboratory experiments. Our system involves a small permanent magnet located inside an annular pipe carrying the flow of a liquid metal. We investigate the Lorentz force acting upon the magnet using a combination of laboratory experiments with liquid metal at room temperature and a simple analytical model. We demonstrate that the measured Lorentz forces are in very good agreement with the predictions of our model over a wide range of geometry parameters. By virtue of its simplicity and close relationship to the well known “creeping magnet” classroom experiment, our system can also serve as an educational tool for introductory courses in liquid metal magnetohydrodynamics.