摘要
为了探究固液相微界面作用的物质输移机制,丰富水-沙-污染物微界面作用的数值模拟方法,本文基于光滑粒子流体动力学方法(SPH)耦合电场力、布朗运动力、曳力等弱作用力,构建复杂微界面作用模型,模拟了细颗粒泥沙吸附Pb^(2+)的微界面作用过程.模拟结果演示了细颗粒泥沙与Pb^(2+)的微界面作用全过程,Pb^(2+)进入液膜,由液膜迁移至颗粒内,逐渐填满液膜和孔道,最终填充空腔.微界面作用动力学分析结果表明模拟结果符合准二级动力学模式;微界面作用模式识别结果表明0~10min为膜扩散阶段,10~60min为膜扩散和颗粒内扩散并存阶段,60~210min为颗粒内扩散阶段.模拟结果具有较好的微界面作用动力学相似性和微界面作用模式一致性.该方法适用于微米尺度下的微界面作用过程模拟,为水-沙-污染物交互作用的微观尺度建模提供新思路.
This paper constructs a complex micro-interface interaction model by coupling the smooth particle hydrodynamics method(SPH)with electric field force,Brownian motion force,and traction force,to simulate the micro-interface interaction process of Pb^(2+)adsorption by fine sediment.The simulation results demonstrated the whole process of micro-interface interaction between fine sediment particles and Pb^(2+),in which Pb^(2+)enters the liquid film,migrates from the liquid film to the particles,gradually fills the liquid film and pore channels,and finally fills the cavity.The results of kinetic analysis of micro-interfacial interaction showed that the simulation results were consistent with the quasi-secondary kinetic model.The micro-interfacial interaction mode identification illustrated that 0~10 min was the membrane diffusion phase,10~60 min was the membrane diffusion and intra-particle diffusion coexistence phase,and 60~210 min was the intra-particle diffusion phase.The simulation results have a good similarity of micro-interface interaction kinetics and consistency of micro-interface interaction patterns.This method is suitable for simulating micro-interface interaction processes and provides new insights for modeling water-sand-pollutant interaction at the microscale.
作者
陈志和
方群生
郑键鹏
CHEN Zhihe;FANG Qunsheng;ZHENG Jianpeng(Civil Engineering School of Sun Yat-sen University,Zhuhai 519082,China;Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute Engineering Research Center for Water Security Regulation in Southern China of Guangdong Province,Guangzhou 510275,China;Shantou Ecological Environment Technology Center,Shantou 515000,China;Geography and Planning School of Sun Yat-sen University,Guangzhou 510275,China;Qingyuan Hydrology Branch Bureau of Guangdong Province Hydrology Bureau,Qingyuan 511500,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2022年第5期1152-1160,共9页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51879291)
