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首页> 外文会议>HTD-vol.376-2; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >EXPERIMENTAL AND NUMERICAL INVESTIGATION OF MELTING IN THE PRESENCE OF A MAGNETIC FIELD:SIMULATION OF LOW GRAVITY ENVIRONMENT
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EXPERIMENTAL AND NUMERICAL INVESTIGATION OF MELTING IN THE PRESENCE OF A MAGNETIC FIELD:SIMULATION OF LOW GRAVITY ENVIRONMENT

机译：磁场作用下的熔化实验与数值研究：低重力环境的模拟

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摘要

An experimental and numerical study is presented on melting behavior of a pure metal in the presence of a static magnetic field. When a transverse magnetic field is present and the working fluid is electrically conductive, the resulting Lorentz forces will dampen the convective flows. Buoyancy driven flow is the focus of this study. Hartmann number, a dimensionless parameter proportional to the strength of magnetic field, dominates the convection flow suppression. The effects of the magnetic strength on melting rate and on the profile of solid/melt interface are studied. The experiments are conducted with pure Gallium as phase change material (PCM) inside a rectangular test cell. The solid/melt interface at the side center position is measured by an ultrasound device and its profile is mapped via the florescent light shadowgraphy. Temperature measurements and volume expansion/contraction tracking are used to verify the experimental result. The results show that the magnetic strength has a remarkable effect on the melting rate and the interface profile. The numerical simulation fits very well with the experimental data especially, at larger Hartmann numbers.
机译：对纯金属在静磁场中的熔化行为进行了实验和数值研究。当存在横向磁场并且工作流体导电时，所产生的洛伦兹力将减弱对流。浮力驱动的流量是本研究的重点。哈特曼数是与磁场强度成比例的无量纲参数，在对流流动抑制中占主导地位。研究了磁强度对熔化速率和固/熔体界面轮廓的影响。实验是在矩形测试室内使用纯镓作为相变材料（PCM）进行的。侧面中心位置的固/熔界面通过超声波设备测量，其轮廓通过荧光影影术绘制。温度测量和体积膨胀/收缩跟踪用于验证实验结果。结果表明，磁强度对熔化速率和界面轮廓有显着影响。数值模拟与实验数据非常吻合，尤其是在较大的哈特曼数下。

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