方形通风管道中粒子沉积的拉格朗日模拟
Lagrangian simulation for particle deposition in square ventilating ducts
摘要：
采用一维耦合拉格朗日旋涡粒子相互作用模型，数值模拟了7 m/s和9 m/s空气流速下直径为10～200 μm的粒子在水平和竖直光滑方形通风管道内的沉积速度。结果表明，在水平管道中，粒子在管道底部的量纲一沉积速度高于垂直壁面和顶部，沉积速度受摩擦速度和粒径的影响较大；在竖直管道中，对于10～80 μm的粒子，量纲一沉积速度随着粒径的增大而增大，对于较大的粒子（粒径约大于80 μm），量纲一沉积速度随着粒径的增大而略微减小；流动方向(向上或向下)对粒子的沉积有明显的影响。
Abstract：
Based on a onedimensional coupling Lagrangian eddyparticle interaction model, numerically simulates deposition rate of particles in smooth horizontal and vertical ventilating ducts for a variety of particle sizes ranging from 10 μm to 200 μm at different air speeds of 7 m/s and 9 m/s. The results show that in a horizontal duct, dimensionless deposition rate to floors is higher than those to vertical wall and ceiling surface and they are all highly dependent on the magnitude of the friction velocity and particle size, and that in a vertical duct, for the particles with the particle size of 10~80 μm, the dimensionless deposition rate increases with particle size, and for larger particles with the particle size greater than about 80 μm, the dimensionless deposition rate slightly decreases with particle size increasing, and that the flow direction, upward or downward, also has a notable influence on particle deposition.
Keywords:ventilatingduct,particledepositionrate,relaxationtime,Lagrangianeddyparticleinteractionmodel