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Behaviour of Molten Metal Film and Effect of Electromagnetic Force.

熔融金属膜的行为和电磁力的影响。

基本信息

批准号：
61470056
负责人：
ASAI Shigeo
金额：
$ 3.07万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

In order to obtain a uniform and stable molten metal film, the shape control function induced by high frequency magnetic field is utilized.Firstly, the falling behaviour of liquid film shaped by a slit nozzle was observed in a water-model experiment by use of a high speed VTR. The Falling liquid is classified into two regions. Namely, one is denoted as the film flow region appearing in the middle part of the falling liquid and the other as the channel flow region appearing in both sides of the film flow region. The eidth of the film flow region decreased continuously with increase in the falling distance. A mathematical model predicting the falling behaviour of the liquid film is developed on the basis of hydrodynamics and is verified by the water-model experimetn.Then, the effect of magnetic field on the falling molten-metal film is studied by the mathematical model taking into account the magnetic pressuer induced by magnetic field. Transverse magnetic field imposed on mercury surface mave and damping behavior was measured by making use of laser beam. It was found that the suppression of wave motion did not depend on field intensity but the gradient of it. A dispersion relation of wave motion. is derived from the theoretical analysis taking into account of the gradient of magnetic field, and is verified by the experimental results.A direct magnetic field imposed virtically to surface of liquid mercury and damping behavior of wave motion was measured by using slit beam. A damping coefficient of wave motion, is derived on the basis of magnetohydrodynamics, and experimental data verifies the theoretical results. Magnetic filed intensity to completely suppress wave motion of molten steel is evaluated by use of the dispersion relation and the damping coefficient derived here.

为了获得均匀稳定的熔融金属膜，利用了高频磁场诱导的形状控制功能。首先，利用高速VTR在水模型实验中观察了狭缝喷嘴形成的液膜的下落行为。下落的液体被分为两个区域。即，一个表示为出现在下落液体中部的膜流区，另一个表示为出现在膜流区两侧的通道流区。随着下降距离的增加，膜流区宽度不断减小。在流体力学的基础上建立了预测液膜下降行为的数学模型，并通过水模型实验进行了验证。在此基础上，建立了考虑磁场产生的磁压力的数学模型，研究了磁场对金属熔膜下降的影响。利用激光束对汞表面施加横向磁场，测量了汞表面的振动和阻尼特性。研究发现，对波动的抑制不取决于场强，而取决于场强的梯度。波动的色散关系。理论分析中考虑了磁场梯度的影响，并得到了实验结果的验证。用狭缝束测量了直接磁场对液态汞表面的虚作用及其对波动的阻尼特性。基于磁流体力学推导了波浪运动的阻尼系数，实验数据验证了理论结果。利用本文导出的色散关系和阻尼系数，计算了完全抑制钢液波动的磁场强度。