A numerical model for turbulent diffusion in gasparticle flows
Abstract
A general twodimensional numerical model for gasparticle flow is presented. The model accounted for twoway gasparticle coupling and the effect of the fluid turbulence on the particle motion. The turbulent interaction between the particles and the fluid was obtained by treating the effect of turbulent diffusion as an averaged body force on the particles. This resulted in the addition of a diffusion drift velocity to the particle velocity equation. The drift velocity was approximated from Fick's law of diffusion, and the difference between the fluid turbulent momentum diffusivity and the particle diffusivity was modeled by prescribing a turbulent Schmidt number. A comparison was made between numerical predictions and experimental data for particle flow in an electrostatic precipitator.
 Publication:

ASME Numerical/Laboratory Computer Methods in Fluid Mechanics
 Pub Date:
 December 1976
 Bibcode:
 1976asme.meetQ....J
 Keywords:

 Electrostatic Precipitators;
 Gas Flow;
 Mathematical Models;
 Particle Diffusion;
 Turbulence Models;
 Turbulent Diffusion;
 Two Dimensional Flow;
 Two Phase Flow;
 Drift Rate;
 Ficks Equation;
 Particle Motion;
 Particle Trajectories;
 Solids Flow;
 Two Dimensional Models;
 Fluid Mechanics and Heat Transfer