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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。
The Lattice Boltzmann method is used to simulate the non-uniform settling flocculation process of two sediment particles under different temperature with the introduction of eXtended Derjaguin-Landau-Verwey-Overbeek theory (XDLVO theory). The results show that the temperature rise shortens the flocculation time of silt and promotes the flocculation. At the same time, the motion trajectory of sediment particles, the relative velocity of motion and the close distance between particles were analyzed, and the influence mechanism of temperature on sediment flocculation was discussed. The results show that the increase of temperature can not only reduce the viscous coefficient of water body and increase the sedimentation velocity of sediment, but also accelerate the close contact of sediment particles. On the other hand, increase the thickness of adsorbed water film on the surface of sediment particles, The close-spaced repulsion between sand particles and the combined effect of the adsorbed water film thickness and repulsive force also promote flocculation.