摘要
推导了一个适用于中小尺寸板状熔体表面电磁压力的计算公式。该式给出了电磁压力系数ｐ 与板厚ａ、电流频率ｆ 、以及材料的电磁参数μγ之间的准确关系。主要结果如下：（１） 当ｆ， ａ ， 以及μγ足够大， 使得板的厚度ａ 与电流集肤厚度δ的比ａ／δ＞ ２ ．２ 时， 电磁压力系数是一个常数（ ｐ ＝ １） ，电磁压力可由公式ｐｍ ＝ Ｂ２／２ μ计算。（２） 但若ｆ， ａ ， 以及μγ比较小， 使ａ／ δ＜ ２ ．２ ， 则电磁压力必须由系数ｐ 进行修正。也就是说， 电磁压力不仅由熔体表面的磁感应强度Ｂ 决定而且也由板的厚度ａ ，电流频率ｆ ， 以及材料的电磁参数μγ决定。
An equation used to calculate electromagnetic pressure for confining and shaping a platelike melt with small or medium thickness is brought forward. The equation gives a precise relationship between electromagnetic pressure factor p and current frequency f, melt thickness a and electromagnetic parameter μγ. The main results can be summarized as follows: (1) As the f, a, and μγ are large enough, causing the ratio of melt thickness to current skining depth a/δ to be larger than 2.2, the p will be a constant( p =1) and the electromagnetic pressure can be calculated with p m =B 2/2μ. (2) As the f, a, and μγ are not large enough, and the ratio a/δ is less than 2.2, the factor p is no longer a constant but changes from 1 to 0 with the decrease of a/δ. In this case, the value of electromagnetic pressure is determined not only by magnetic flux density B but also by the current frequency f, melt thickness a and electromagnetic parameter μγ.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1999年第A01期173-177,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金
中国博士后科学基金
关键词
电磁约束成形
电磁压力
磁感应强度
electromagnetic confinement and shaping electromagnetic pressure magnetic flux density
