Lagrangian simulation for particle deposition in square ventilating ducts

Based on a onedimensional coupling Lagrangian eddyparticle 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.