泥沙研究2017，Vol.42Issue(2)：35-40,6.DOI:10.16239/j.cnki.0468-155x.2017.02.006
温度对黏性泥沙絮凝影响的机理研究
Study on the influence of temperature to cohesive sediment flocculation
摘要
Abstract
Flocculation processes of two cohesive sediment particles in quiescent water under different water temperatures are investigated based on the Lattice Boltzmann model and the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory.Results show that the high temperature will shorten the flocculation time and promote the flocculation processes.Furthermore,the particle trajectories,relative velocities and the inter-particle forces at short distance of the two particles are analyzed to discuss the flocculation mechanism due to the temperature.The analyzed results reveal that the higher temperature,on the one hand,decreases the water viscosity and increases the settling velocities of particles,to make particles easier to aggregate into floc.On the other hand,the temperature increases the thickness of the absorbed water film on particle surface with a repulsion force between them.Finally,the combined effect on the flocculation is helpful to flocculation.关键词
温度/黏性泥沙/格子玻耳兹曼模型/沉降絮凝/XDLVO理论Key words
temperature/cohesive sediment/Lattice Boltzmann model/settling and flocculation/XDLVO theory分类
建筑与水利引用本文复制引用
乔光全,张金凤,张庆河..温度对黏性泥沙絮凝影响的机理研究[J].泥沙研究,2017,42(2):35-40,6.基金项目
国家自然科学基金创新研究群体科学基金资助项目(51321065)和国家自然科学基金资助项目(51579171) （51321065）
