APPLICATION OF PINCH FORCE TO THE SEPARATION OF INCLUSION PARTICLES FROM LIQUID STEEL
APPLICATION OF PINCH FORCE TO THE SEPARATION OF INCLUSION PARTICLES FROM LIQUID STEEL
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DOI：
10.2355/isijinternational.34.722
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发表时间：
1994-01-01
影响因子：
1.8
通讯作者：
BRIMACOMBE, JK
中科院分区：
文献类型：
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作者：
TANIGUCHI, S;BRIMACOMBE, JK
挤压力是冶金领域中最常见的电磁力之一，它是通过对液态金属施加电流而产生的。 在这个力场中，悬浮在液态金属中的非导电颗粒受到与箍缩力方向相反的力，被挤出液态金属。本研究将上述原理应用于钢液中非金属夹杂物颗粒的分离。 首先，采用轨迹法计算了层流条件下钢液中非金属夹杂物颗粒的分离效率η。 发现η值是V（R）、（C（I）D（R）2/Re）Z和r1/delta的函数，其中r1是管道的半径，delta是趋肤深度，V（R）、C（I）、D（R）、Re和Z是无量纲参数。 对于直径超过60 μ m的颗粒，在配备有通道感应炉的连续铸造炉中的η的估计值大于95%。 其次，用浓度法计算了方管的η值。 在这种情况下，发现η的值是V（R）和（C（I）D（R）2/Re）Z在x1/delta=0时的函数，其中x1是方管的半宽。 然而，随着x1/delta的增加，由于集肤效应，二次流出现在管道的横截面中。 发现这些流动通过将内部区域中的颗粒向壁输送来增加η的值。
The pinch force which is one of the most common electromagnetic forces in the metallurgical field can be generated by imposing an electrical current on a liquid metal. In this force field, electrically nonconductive particles suspended in a liquid metal experience a force in the opposite direction to the pinch force, and are squeezed out from the liquid metal.In this study, the above principle was applied to the separation of nonmetallic inclusion particles from liquid steel. Firstly, the separation efficiency, eta, of nonmetallic inclusion particles from the liquid steel flowing in a circular pipe was calculated by the trajectory method under laminar flow conditions. The value of eta was found to be a function of V(R), (C(I)D(R)2/Re)Z and r1/delta, where r1 is the radius of the pipe, delta is the skin depth and V(R), C(I), D(R), Re and Z are nondimensional parameters. The estimated value of eta in a continuous casting tundish equipped with a channel-induction furnace was greater than 95% for particles with a diameter over 60 mum. Secondly, the value of eta for a square pipe was computed by the concentration method. In this case, the value of eta was found to be a function of V(R) and (C(I)D(R)2/Re)Z at x1/delta=0, where x1 is the half width of the square pipe. However, with increasing x1/delta, secondary flows appeared in a cross section of the pipe because of the skin effect. These flows were found to increase the value of eta by transporting the particles in the inner region toward the wall.