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Abstracts of the papers published in Tetsu-to-Hagane Vol.103(2017),No.9

机译:论文摘要刊登在Tetsu-to-Hagane Vol.103(2017),No.9中

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摘要

Induction heating of a molten steel in a channel enhances inclusion removal though its purpose is heating. Thus, the optimum operating condition have not been clarified until now. In this study, theoretical analysis and numerical calculation of the inclusion behavior under the imposition of A.C. magnetic field using simple 2D model have been investigated. The rising velocity of the inclusion gradually increases as it approaches to the upper surface because the dominant driving force in the center area of the molten steel is buoyancy force and that in the upper region is a pinch force. Approximate mathematical expressions of the inclusion trajectory have been derived under the consideration of these dominant force. And removal time of the inclusion has been also theoretically derived. The shielding parameter in the range of 5 - 10 is the optimum condition to minimize the inclusion removal time, because the pinch force is weak in the case of small shielding parameter and the electromagnetic force dominant region is limited only in the vicinity of the metal surface in the case of large shielding parameter. The optimum shielding parameter relates channel size with frequency. Increase in magnitude of the magnetic flux density is another method to decrease the inclusion removal time. The pinch force in the vicinity of the channel wall overcome a force by turbulence and Saffman force under a certain condition which can be realized in industry, thus the inclusion reaches the channel wall.
机译:通道中钢水的感应加热虽然目的是加热,但可以提高夹杂物的去除率。因此,到目前为止还没有弄清最佳操作条件。在这项研究中,研究了使用简单的2D模型在交流磁场作用下夹杂行为的理论分析和数值计算。夹杂物的上升速度随着其接近上表面而逐渐增加,这是因为在钢水的中心区域中的主要驱动力是浮力,而在上部区域中的主要驱动力是挤压力。考虑到这些主导力,已经得出了夹杂物轨迹的近似数学表达式。从理论上也已经得出了夹杂物的去除时间。屏蔽参数在5到10的范围内是使夹杂物去除时间最短的最佳条件,这是因为在屏蔽参数较小的情况下,夹紧力较弱,并且电磁力主导区域仅在金属表面附近受到限制在屏蔽参数较大的情况下。最佳屏蔽参数将通道大小与频率相关联。增加磁通密度的大小是减少夹杂物去除时间的另一种方法。通道壁附近的挤压力在一定条件下克服了湍流和萨夫曼力的作用,这在工业上是可以实现的,因此夹杂物到达通道壁。

著录项

  • 来源
    《ISIJ international》 |2017年第9期|1668-1669|共2页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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