| 絮体分形结构对沉淀速度影响研究 |
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| 引用本文： | 钟润生,张锡辉,肖峰,李晓岩.絮体分形结构对沉淀速度影响研究[J].环境科学,2009,30(8):2353-2357. |
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| 作者姓名： | 钟润生 张锡辉 肖峰 李晓岩 |
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| 作者单位： | 1. 清华大学深圳研究生院环境工程与管理研究中心,深圳,518055
2. 香港大学土木工程系,香港 |
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| 基金项目： | 国家高技术研究发展计划(863)项目(2002AA601120);;国家自然科学基金项目(20721140019,U0773002) |
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| 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.
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| 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 |
| 收稿时间： | 2008/9/24 0:00:00 |
| 修稿时间： | 2008/11/18 0:00:00 |
Effects of Fractal Structure on Settling Velocities of Flocs |
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| ZHONG Run-sheng,ZHANG Xi-hui,XIAO Feng and LI Xiao-yan.Effects of Fractal Structure on Settling Velocities of Flocs[J].Chinese Journal of Environmental Science,2009,30(8):2353-2357. |
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| Authors: | ZHONG Run-sheng ZHANG Xi-hui XIAO Feng and LI Xiao-yan |
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| Institution: | 1.Research Center for Environmental Engineering & Management;Graduate School at Shenzhen;Tsinghua University;Shenzhen 518055;China;2.Department of Civil Engineering;The University of Hongkong;Hongkong;China |
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| Abstract: | 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 ... |
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| Keywords: | floc structure settling velocity three-dimensional fractal dimension humic acid particle image velocimetry technique |
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