Effect of Magnetic Field on Thermal Convection of Glass Melt

Naoyuki KITAMURA; Kohei FUKUMI; Junji NISHII; Kohki TAKAHASHI; Iwao MOGI; Satoshi AWAJI; Kazuo WATANABE

doi:10.14852/jcersjsuppl.112.0.S1210.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 17

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S1210.0

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Host: The Ceramic Society of Japan

Co-host: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.

Papers

Effect of Magnetic Field on Thermal Convection of Glass Melt

Naoyuki KITAMURA, Kohei FUKUMI, Junji NISHII, Kohki TAKAHASHI, Iwao MOGI, Satoshi AWAJI, Kazuo WATANABE

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Keywords: Phosphate glass, Glass melt, Thermal convection, High magnetic field, Flow control

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Abstract

We have developed a system for in-situ observation of glass melts under high magnetic field up to 10 T. Thermal convection in binary potassium phosphate melts was observed under vertical and transverse magnetic fields. Above 1 T, the flow velocity of the convection decreased to one-third of the velocity at 0 T in the melt of low potassium content glass by applying vertical and transverse magnetic fields. Contrary to this, the flow velocity increased in the melt of high potassium content glass by applying transverse magnetic fields of around 1 T. It was deduced that different electro-magnetic forces act on positively charged potassium ions and negatively charged clusters consisting of PO₄ tetrahedra resulting in the attenuation or acceleration of the flow velocity of the melts.

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