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Model Experiment and Theoretical Analysis on Direct Induction Skull Melting

直接感应熔壳模型实验与理论分析

基本信息

批准号：
03453065
负责人：
ASAI Shigeo
金额：
$ 4.48万
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：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

A direct induction skull melting method, in which a water-cooled induction coil is directly used as a crucible, enjoys an advantage of non-contamination from the crucible together with high energy efficiency. However, the applications of this method are limited to the materials with electrical insulating property in solid state. The aim of this study is to extend the applicable materials of the process and to melt and hold the materials with electrical conducting property in solid state such as metals and semiconductors by coating an insulating film on the coil surface. In order to clarify a theoretical base of the process, electric and magnetic field and a temperature one are simultaneously analyzed by taking account of the differences of electrical and thermal conductivities in solid and liquid states. Experiments demonstrate the feasibility of the process for a stainless steel and a silicon which indicate the electrical conducting property in solid state and clarify the validity of … More the theoretical results. It is found that the conditions of the smaller thermal conductivity, the higher heat transfer coefficient and the lower magnetic frequency, can provide the wider range of the magnetic field to form the stable skull.A new method of melting and holding of a material with low thermal and electrical conductivities is proposed to overcome the problems of long heating period and localized overheat in a charge. In this melting method, a water cooled induction coil is directly used as a crucible, and the elements heated by a high frequency magnetic field are submerged into the charge. Experiments have been conducted on glass under various operating conditions, i.e.the coil current, the frequency and the radius of the heating elements. A mathematical model is developed to calculate the process variables such as the heat generation rates in the coil and the heating elements, and the temperature distribution in the charge. The calculated process variables are compared with the observed ones. The considerably good agreement between the theoretical and experimental results indicates the validity of the model. The heat generation rate in the heating elements is determined by the ratio of the radius of the heating element to the electromagnetic penetration depth and has the maximum value at the ratio of 1.8. Less

直接感应颅骨熔炼法采用水冷感应线圈直接作为坩埚，具有坩埚不受污染和高能效的优点。然而，该方法的应用仅限于具有固态电绝缘性能的材料。本研究的目的是扩展该工艺的适用材料，并通过在线圈表面涂覆绝缘膜，将金属和半导体等具有导电性能的材料熔化并保持在固态。考虑到固体和液体的电导率和导热系数的差异，同时对电场、磁场和温度场进行了分析，以阐明这一过程的理论基础。实验证明了该工艺在不锈钢和硅的固态导电性能上的可行性，进一步验证了理论结果的有效性。研究发现，热导率越小、换热系数越高、磁频率越低的条件下，可以提供更宽的磁场范围来形成稳定的颅骨。提出了一种低导热、低导电性材料的熔炼保温新方法，克服了加热周期长和炉料局部过热的问题。在这种熔化方法中，直接使用水冷感应线圈作为坩埚，将高频磁场加热的元件浸入装料中。在玻璃上进行了各种操作条件下的实验，即线圈电流，加热元件的频率和半径。建立了一个数学模型来计算过程变量，如线圈和加热元件的产热率，以及炉料中的温度分布。计算得到的过程变量与观测值进行了比较。理论与实验结果吻合较好，表明了模型的有效性。发热元件的发热率由发热元件半径与电磁穿透深度之比决定，在该比值为1.8时达到最大值。少