Particle Deposition in a Turbulent Channel Flow

Motion of spherical solid particles in a fully developed turbulent channel flow is numerically simulated. This study presents a computational model for Lagrangian simulation of particle transport, dispersion and deposition. The instantaneous fluctuating velocities are simulated using a Langevin model. Finite volume method is used to solve the steady state conservation of mass, momentum and RNG k-ε equations. The DNS data for the anisotropic turbulent intensities are used in the analysis. The particle equation of motion takes into account the Stokes drag, Saffman lift force, the Brownian and gravitational forces. The Brownian diffusion is simulated as a white noise process. Starting with an initially uniform concentration near the wall, an ensemble of particle trajectories is generated. The computational model predictions for particle deposition velocity are compared with the existing experimental data and earlier simulation results and good agreement was achieved.