温度对黏性泥沙絮凝影响的机理研究

发布时间：2018-04-23 03:35

本文选题：温度 + 黏性泥沙　；参考：《泥沙研究》2017年02期

【摘要】：用格子玻耳兹曼方法,引入胶体作用理论(e Xtended Derjaguin-Landau-Verwey-Overbeek theory,XDLVO理论)模拟不同温度下两个黏性泥沙颗粒静水不等速沉降絮凝过程。结果表明,温度升高缩短泥沙絮凝时间,促进絮凝。同时分析了泥沙颗粒的运动轨迹、相对运动速度和颗粒间近距离作用力,探讨温度对泥沙絮凝的影响机理。分析结果认为温度升高一方面减小水体黏性系数,加大泥沙沉速,加快泥沙颗粒相互靠近;另一方面,增大泥沙颗粒表面吸附水膜厚度的同时,也增大泥沙颗粒之间的近距离排斥力,对吸附水膜厚度和排斥力影响的综合结果也促进了絮凝。
[Abstract]:The lattice Boltzmann method was used to simulate the flocculation process of two viscous sediment particles at different temperatures by introducing the colloidal action theory Xtended Derjaguin-Landau-Verwey-Overbeek the theory of XDLVO. The results show that the increase of temperature shortens the flocculation time and promotes flocculation. At the same time, the movement track, relative velocity and close distance force of sediment particles are analyzed, and the influence mechanism of temperature on sediment flocculation is discussed. The results show that the increase of temperature can decrease the viscosity coefficient of water body, increase the sedimentation speed and accelerate the approaching of sediment particles, on the other hand, increase the thickness of water film on the surface of sediment particles, at the same time, increase the thickness of water film on the surface of sediment particles. The close repulsive force between sediment particles is also increased, and the comprehensive results of the influence on the thickness and repulsive force of the adsorbed water film also promote flocculation.
【作者单位】：中交第四航务工程勘察设计院有限公司;天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金创新研究群体科学基金资助项目(51321065);国家自然科学基金资助项目(51579171)
【分类号】：TV142.1

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