连续微滤系统膜垢生长过程的模型与模拟

应用分形理论中DLA模型,建立了膜垢分形生长模型。通过改变边界条件和随机粒子产生的几率,得到不同条件下膜垢形成与生长过程的模拟图像;采用显微粒子图像技术,通过量子点荧光示踪剂对不同条件下连续微滤系统膜垢的形态和流场进行同时观测与分析。结果表明,模拟与实验所获得的分形维数相近,该模型能够较好地模拟膜垢形成与生长过程;运用该模型数值模拟分析了流场和悬浮物浓度对膜垢生长过程的影响及其动态变化规律。

Model and numerical simulation of membrane deposits formation and growth in continuous microfiltration system

The membrane deposits formation and growth model based on fractal theory were developed,it can dynamically describe the fouling process on outer surface of membrane.Using this model to change the boundary conditions and initial particle production chance,the process of membrane deposits formation and growth was simulated under different conditions.The micro-PIV technology was applied in membrane fouling observed experiment.Using Quantum dot fluorescent tracer,it was realized that membrane deposits morphology and its surrounding flow field were simultaneously observed and analyzed.The results of fractal dimensions were pretty much to be expected.It indicated that the relevant model of membrane deposits formation and growth were well exemplified in practice.The relevant model was used to simulate the impact of flow flied and suspended solids concentration on the dynamical variation of membrane deposits formation.