| 絮体分形结构对沉淀速度影响研究 |
| 摘要点击 3566 全文点击 2047 投稿时间：2008-09-24 修订日期：2008-11-18 |
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| 中文关键词 絮体结构 沉淀速度 三维分形维数 腐殖酸 粒子图像测速技术 |
| 英文关键词 floc structure settling velocity three-dimensional fractal dimension humic acid particle image velocimetry technique |
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| 中文摘要 |
| 利用基于微天平的质量-粒径法和基于改进粒子图像测速技术的自由沉淀法对高岭土、腐殖酸絮体的分形结构进行了研究.结果表明，质量-粒径法得到的铁盐絮体三维分形维数为2.14～2.28，明显大于铝盐絮体的1.75～1.83，铁盐絮体结构更为致密，而铝、铁-腐殖酸絮体比相应的高岭土絮体分形维数要小.絮体分形维数与沉淀速度具有良好的对应关系，分形维数越大，絮体沉淀速度越大.质量粒径法与自由沉淀法求出的絮体分形维数相吻合，分形絮体沉淀速度不再满足Stokes沉淀速度公式. |
| 英文摘要 |
| Fractal structures of kaolin and humic flcos by the mass-size method based on the microbalance and free-settling method based on particle image velocimetry technique were investigated. The results showed that kaolin and humic flocs were characterized by fractal structure. The three-dimensional fractal dimensions of Fe flocs with more compact structure ranged from 2.14 to 2.28 are larger than those of alum flocs ranged from 1.75 to 1.83 by the mass-size method. The fractal dimensions of humic flocs are smaller than those of kaolin flocs. The fractal dimension has a close relationship with the settling velocity of flocs. The larger the fractal dimension, the higher the settling velocity. The fractal dimensions by the mass-size method are in good agreement with those by the free-settling method. The measured settling velocities of fractal aggregates do not follow with Stokes' law. |
