Particle deposition in a ventilation duct bend

This study presents numerical modelling to predict the dilute and monodisperse gas-solid turbulent flow inside a smooth ventilation duct bend. The methodology is to follow the procedures of CFD (Computational Fluid Dynamics) to estimate the particle deposition on curved duct surface with a Eulerian-Lagrangian approach. The objective is to validate the results reported by Sun et al. (2013) that experimentally studied the airflow within a 0.1 m side square cross section 90° duct bend, with a Reynolds number of 35,600 and for the particle diameter between 1 to 25 μm. To carry out this objective, the simulations were conducted with the OpenFOAM® computational code and the grids were generated with Solome®. The outcomes were presented in terms of penetration and dimensionless particle deposition velocity for each Stokes number. The penetration was overpredict for particles with the diameter higher than 5 μm, however the curve behavior was the same, i.e., the penetration decreased with the increase of particle diameter. A good agreement with literature regarding the dimensionless deposition velocity was observed in the eddy-diffusion impaction regime.