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MECHANISM OF MAGNETOTHERMAL WIND INDUCED BY KELVIN FORCE

DOI: 10.1615/IHTC13.p6.70
9 pages

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

Abstract

The model system designed to evaluate the present numerical computations is composed of two coaxial circular pipes with open ends. The outer pipe corresponds to the bore space of the superconducting magnet and is cooled isothermally. The inner pipe is assumed to be placed inside this bore space and is partly heated isothermally. This model system was considered in order to elucidate the effect of a Kelvin force on the free convection of air in the inner pipe. The vertical magnetic field gradient generated in the bore space as a source of the Kelvin force was replaced by that generated by the electric current circulating within the circular electric coil. The present numerical computations were carried out by changing the relative positions of the circular electric coil and the inner pipe. When the circular electric coil was placed at the lower end of the heated region, the free convection was accelerated by the Kelvin force and an upward magnetothermal wind was created. On the other hand, when the circular electric coil was placed at the upper end of the heated region, the free convection was suppressed by the Kelvin force and a downward magnetothermal wind was created.

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Measurement of fluid temperature with an arrangement of three thermocouples