BROWNIAN PARTICLE DEPOSITION IN A DIRECTLY SIMULATED TURBULENT CHANNEL FLOW

Diffusion of submicron particles in a simulated turbulent channel flow field is studied. The turbulent flow velocity field is generated by a direct numerical integration of the Navier-Stokes equation with the pseudospectral method. The equation of motion of particles including the Brownian effects is used and ensembles of particle trajectories are numerically evaluated and statistically analyzed. A uniform initial concentration of particles is used in the analysis. Effects of size on particle dispersion and wall deposition processes are studied. The results are compared with the existing models for the submicron particle deposition rate.