Zang and Ahmadi (2000)-

Particle transport and deposition play a major role in filtration, combustion, air and water pollution, coal transport and cleaning, microcontamination control, xerography, and many other industrial processes.

For trajectory analysis of aerosol particle transport and deposition in vertical and horizontal turbulent duct flows, Zang and Ahmadi (2000) used a particle equation of motion including:

• -Stokes drag,
• -Brownian diffusion,
• -Lift force, and
• -Gravitational forces

The flow field is generated by a DNS of the Navier-Stokes equation with the aid of a pseudospectral method.

Result Simulation agree with Experiment: The lift and drag forces play a dominant role in particle transportation and deposition.
The Brownian force significantly affects the dispersion of submicrometre particles.
Gravity affects the particle deposition process in a vertical duct through the lift force and through direct sedimentation in a horizontal duct.