NUMERICAL SIMULATION OF PARTICLE-SURFACE INTERA CTION IN A TURBULENT CHANNEL FLOW

This study presents a computational model for Lagrangian simulation of particle transport, dispersion, deposition and rebounding in a turbulent channel flow. An empirical mean velocity profile for the fluid velocity and experimental data for turbulent intensities are used for the current case. The instantaneous fluctuating velocities are simulated as continuous Gaussian random fields. The particle equation of motion takes into account the Stokes drag, the Saffman lift, the Brownian, and the 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 and statistically analyzed. Several simulations for deposition of aerosol particles of various sizes are performed and the corresponding deposition velocities are evaluated. The effect of particle rebound from surface on particle deposition velocity is also taken into consideration. The computational model predictions for particle deposition velocity are compared with the existing experimental data and earlier simulation results and favorable agreements are observed.

Keywords:

Turbulent Flow , Transport , Dispersion and Deposition of Particles , Particle Rebound