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›› 2002, Vol. 2 ›› Issue (4): 0-0.

• 4 •    

直流电弧等离子体法合成金属和陶瓷纳米颗粒

李星国，廖复辉   

  1. 北京大学化学与分子工程学院，北京 100871
  • 出版日期:2002-08-20 发布日期:2002-08-20

Numerical Simulation of Electromagnetic Stirring Flow of Metal Pad in Aluminum Reduction Cells

ZHOU Ping, ZHOU Nai-jun, MEI Chi, JIANG Chang-wei, CAI Qi-feng   

  1. Dept. Chem. Eng., Tsinghua Univ., Beijing 100084, China
  • Online:2002-08-20 Published:2002-08-20

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被引次数

83

摘要： 介绍了直流电弧等离子体法制备纳米颗粒的原理和条件以及由此法制备的纳米颗粒的种类、结构和性能. 用直流电弧等离子体法能够合成金属、氧化物、氮化物、碳化物及氢化物等多类纳米颗粒. 合成的颗粒大小因合成条件和成份而变化，一般在10~200 nm. 这种方法的合成速度比传统的真空蒸发法快10倍以上，适合工业化生产.

关键词: 直流电弧等离子体, 金属, 陶瓷, 纳米颗粒

Abstract: Delivery of catalyst particles by a screw feeder at the inlet of a downer in a hot model was studied, and the effects of pressure difference, downward wind, temperature on feeding rate were investigated. Experimental results show that the feeding rate can be flexibly controlled by adjusting the pressure in the catalyst feeding tank.

Key words: aluminum reduction cell, electromagnetic stirring motion, turbulent Reynolds number, Hartman number, numerical simulation, k–e model

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