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磁场对KNbO3熔体中温度分布影响的实验研究

梁歆桉; 金蔚青; 潘志雷; 刘照华   

  1. 中国科学院上海硅酸盐研究所, 上海 200050
  • 收稿日期:1999-01-21 修回日期:1999-02-08 出版日期:2000-02-20 网络出版日期:2000-02-20

Experiments on Influence of Magnetic Field on Distribution of Temperature in KNbO3 Melt

LIANG Xin-An; JIN Wei-Qing; PAN Zhi-Lei; LIU Zhao-Hua   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-01-21 Revised:1999-02-08 Published:2000-02-20 Online:2000-02-20

摘要: 研究了磁场对KNbO熔体中的温度分布的影响.利用加磁场的休仑微分干涉显微实时观察装置及一种近似的间接测温方法,对在不同磁场强度0、70、117、135mT下,KNbO熔体中的径向温度分布进行测量.发现随着磁场强度的增大,熔体中的径向温度梯度减小,尤其在坩埚-熔体界面附近,浮力驱动对流占主要作用的区域,温度梯度的减小更加明显.这可能是由于磁场对熔体中浮力驱动对流抑制的结果.

关键词: 磁场, KNbO3, 抑制, 浮力驱动对流, 温度分布

Abstract: The effect of magnetic field on temperature distribution in KNbO3 melt was experimental studied. By utilizing a special temperature
measurement technique, the KNbO3 melt temperature distribution in a 2mm diameter platinum crucible was measured under 0, 70, 117, 135mT transverse
magnetic field respectively. The results show that the temperature gradient along crucible radius decreases with magnetic intensity increasing, especially,
the temperature gradient close to crucible-melt interface where the buoyancy-driven convection is the main convection form decreases greatly. It may
implie that magnetic field can damp up the buoyancy-driven convection in KNbO3 melt.

Key words: magnetic field, KNbO3, damping, buoyancy-driven flow, distribution of temperature

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