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CONVECTIONAL CONTROL IN SILICON MELTS UNDER A ROTATING MAGNETIC FIELD

Masato Akamatsu
Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan

Mitsuo Higano
Akita Prefectural University

Hiroyuki Ozoe
Institute of Advanced Material Study, Kyushu University, Kasuga, Japan; and Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China

要約

Numerical computations were carried out to study convectional mode and electrical field in silicon melts in a cylindrical container which is sufficiently long in an axial direction under no magnetic field and a rotating magnetic field for various rotational rates of a cylindrical container and a magnetic field. Under no magnetic field, fluid represented a rigid rotation for Pr=0.013 and Recyl=1 183. Under a rotating magnetic field, Lorentz force in a circumferential direction was found to work when the rotational rate of a magnetic field and that of a cylindrical container were different. Computations were carried out for the combination of parameters such as Pr=0.013, Recyl=0, 1183, Remag=1183, 2366, -1183 and Ha=21.5, 53.7. For these cases, except near the container wall, fluid in a cylindrical container rotated with the rotational rate of a magnetic field.

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