【摘要】 为探究絮凝体微观形态结构、混凝机理及动力学过程,分析了传统絮凝模型的假设与试验结果相矛盾的问题,阐述了絮凝体分形生长模型、絮凝动力学模型和分形絮凝体破碎模型等典型絮凝分形模型的特点与应用条件.絮凝体分形生长模型是研究形成结构致密絮凝体途径的基础;絮凝动力学模型的研究使颗粒碰撞频率函数更适于数值模拟;絮凝体破碎模型对混凝工艺运行条件控制,以及絮凝剂优选和絮凝设备优化等有实际指导意义.絮凝模型拓展研究应以定量描述絮凝体的形态和结构为重点.更多还原

【Abstract】 In order to investigate the microscopic structure of flocs and the mechanisms and the dynamic process of coagulation,the contradictions between assumptions in traditional models and experimental results were analyzed,and the characteristics and application conditions of the flocs fractal growth model,flocculation kinetic model and flocs break-up model were presented.The stepwise growth model is a foundation of compact flocs formation study.The flocculation kinetic model makes particle collision equation easier to simulate.The flocs break-up model can help to optimize the operation,flocculant and equipment in the coagulation process.It is recommended that the quantitative description of the morphology and structure of flocs be the emphasis of further study of floc model.更多还原