絮团形态的动态演变

实验考察了絮凝过程中广义絮团（包括单体颗粒、线状絮团、面状絮团及体状絮团）的黏性分维数、特征黏度、絮团的黏性组成等随絮凝时间的动态演变。结果表明，在絮凝过程中，单体颗粒的黏性分维数与其拓扑维数一致，其余各类絮团的黏性分维数均小于其对应的拓扑维数，其中线状絮团的分维数基本不受絮凝时间的影响，但面状絮团及体状絮团的分维数随絮凝过程的进行逐渐增大但最终趋于稳定；所有絮团的特征黏度与絮凝时间无关，其中线状、面状及体状絮团的特征黏度依次具有103、104和105的数量级；各类絮团的黏性组成随絮凝过程的进行表现出不同的变化态势。

Dynamic evolution of floc morphology

A series of experiments were designed to examine the dynamic evolution of the viscous fractal dimensions,specific viscosity,and composition of flocs with the flocculation time.The analyzed flocs included single particles,linear,planar,and volumetric flocs.The test results were treated and analyzed on the basis of a mathematical model of viscosity vs.fractal dimension developed before by the same authors.The experimental results showed that the viscous fractal dimensions of single particles were consistent with their topological dimensions,whereas the fractal dimensions of the other flocs were lower than their topological ones.In addition,while the fractal dimensions of linear flocs remained stable during the whole flocculation progress,those of both planar and volumetric flocs increased with time and eventually tended toward equilibrium values.The specific viscosity for all types of flocs was independent of the flocculation time,and the specific viscosities of linear,planar,and volumetric flocs were of magnitude of 103,104,and 105,respectively.