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›› 2003, Vol. 3 ›› Issue (4): 0-0.

• 4 •    

管内振荡流中轴向有效扩散系数的确定

叶晓峰   

  1. 上海交通大学机械与动力工程学院，上海 200030
  • 出版日期:2003-08-20 发布日期:2003-08-20

Separation Characteristics of Binary Particulate Systems in a Vibrating Fluidized Bed

JIN Hai-bo1, ZHANG Ji-yu2, ZHANG Bi-jiang2   

  1. 1. Department of Chemical Engineering, Institute of Petrochemical Technology, Beijing 102600, China;2. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
  • Online:2003-08-20 Published:2003-08-20

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摘要： 将管内振荡流中物质扩散系统近似地作为一维非稳态系统，分析了用脉冲注射法确定振荡流中轴向物质扩散系数时，扩散物初始分布的两种形态?正态分布和矩形分布对有效扩散系数测定精度的影响. 分析结果表明，如果浓度测定点与注入点间的距离大于扩散物初始分布宽度的10倍，计算误差将小于1%. 实验所用圆管长2.5 m，内径6 mm，扩散系统的Schmidt数3590，流体振动幅度30~200 mm，Womersley数2.38~10.64. 实验结果与理论计算结果具有良好的一致性.

关键词: 振荡流, 管内流, 强化扩散, 有效扩散系数

Abstract: Separation characteristics of 13 kinds of binary mixtures were investigated in a vibrating fluidized bed. A separation index, which was given by Williams through comparing the jetsam concentration in the upper and lower layers, was suggested. According to the effects of vibrating parameters and operating conditions on the separation index, the optimum vibrating parameters were obtained. From experimental results, the criterion of demarcating mixing/separation regions, which was defined by Zhang et al, was modified.

Key words: vibrating fluidized bed, binary system, particle separation, separation index, vibration intensity

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