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CONTROL OF HEAT TRANSFER OF AIR BY THE MAGNETIZING FORCE UNDER GRAVITATIONAL AND NON-GRAVITATIONAL FIELDS

Mitsuo Higano
Akita Prefectural University

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

Yasumasa Okazaki
Faculty of Systems Science and Technology, Akita Prefectural University, 84-4 Tsuchiya-Ebinokuchi, Honjo, Akita 015-0055, JAPAN

Abstract

This study focuses on how magnetizing force affects the heat transfer of air with the paramagnetic property in a vertical cylindrical container with thermal and magnetic gradients. As a first step of the research, two-dimensional numerical computations were carried out in order to clarify the influence of magnetizing force for the air layer in a vertical cylindrical container with the stagnant conduction state in both gravitational and non-gravitational fields. In the present numerical computations, several sizes and positions of a circular electric coil were tested so that the magnetizing force depended on the magnetic field gradient. In both gravitational and non-gravitational fields, the convection was induced from the air layer of the stagnant conduction state by the magnetizing force. The flow pattern greatly depended on the axial position of an electric coil. On the other hand, Nusselt number greatly depended on the size of an electric coil and the magnetic strength in addition to the axial position of an electric coil. The Nusselt number in a non-gravitational field was increased in comparison with that in a gravitational field by the buoyant gravitational force. These phenomena could be successfully explained by visualizing the field of magnetizing force and considering the mass magnetic susceptibility of air according to Curie's law.

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