不同尺寸管道中细颗粒的沉积运动规律研究

Study on sedimentation movement of fine particles in pipelines of different sizes

研究不同尺寸管道中颗粒物的运动沉积情况,对于采用合理管道,以减少管道中的颗粒物具有重要价值。利用流体分析软件模拟不同尺寸管道内水介质中细颗粒物的沉积运动规律,得出管道尺寸对细颗粒物沉积运动的影响。结果表明:流体在管道中流动的过程中,壁面附近的流体流速低于管道内部流体流速,壁面附近的压力高于管道内部;流体在管道运动过程中,逐渐发展完全,压力与流速在后半段趋于稳定。在管道直径一定的情况下,颗粒物沉积率随管道长度增大而增大;在管道长度一定的情况下,颗粒物沉积率随管道直径增大而减小;当管道长度较短且管道直径较大时,颗粒物沉积现象不明显;当管道管径同时变化时,对颗粒物沉积产生综合影响,变化规律非线性。

Studying the movement and deposition of particulate matter in pipes of different sizes is of great value for adopting reasonable pipes to reduce particulate matter in pipes.The fluid analysis software is used to simulate the deposition movement of fine particles in water medium in pipes of different sizes,and the influence of pipe size on the deposition movement of fine particles is obtained.The results show that in the process of fluid flowing in the pipeline,the fluid flow velocity near the wall flour is lower than the fluid flow velocity inside the pipeline,and the pressure near the wall flour is higher than that inside the pipeline.During the movement of the pipeline,the fluid gradually develops completely,and the pressure and flow rate tend to stabilize in the second half.When the pipe diameter is fixed,the particle deposition rate increases with the pipe length.When the pipe length is fixed,the particle deposition rate decreases with the pipe diameter increasing.When the pipe length is short and the pipe diameter is large,the particle deposition phenomenon is not obvious.When the pipe diameter changes at the same time,it will have a comprehensive impact on particle deposition,and the change rule is nonlinear.