Deposition of particles in a turbulent pipe flow

Effects of flow direction, nonlinear drag and the corrected lift force on particle deposition rate in turbulent pipe flow is studied. A digital simulation technique is used and the trajectories of particles of different sizes are analyzed. The experimental data for the mean flow field and the intensities of fluctuation velocity components are used in the analysis, and the effects of turbulent diffusion and Brownian dispersion are included in the computational model. The instantaneous turbulent fluctuation is simulated as a continuous Gaussian random vector field and the Brownian force is modeled as a Gaussian white-noise random process. Ensembles of particle trajectories are evaluated and statistically analyzed. It is shown that the simulation results for the deposition velocity are in reasonable agreement with the model predictions, the available experimental data, and the recent simulation results for channel flows. It is shown that the downward gas flow in a vertical pipe enhances the particle deposition rate, while the upward flow reduces it.