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Understanding the mechanisms of particle dispersion in turbulent flows is important in many industrial, environmental, and energy-related processes. In the management of dust in clean rooms, chemical reactions involving a particulate catalyst, the flow of liquid and gas mixtures through process equipment, and in the combustion of liquid sprays needs to be controlled. M. Fairweather et al. showed in their experiments that particles deposited in the wall region usually did not attain a uniform distribution in the spanwise direction. In channel flows it was reported that particle locations tend to correlate with instantaneous regions of low values of the streamwise velocity, with particles congregating in low velocity streaks within the flow and avoiding high-velocity regions. In the duct flow, a similar particle behavior could be observed, where the instantaneous distribution of particles in the region x + < 30 from the duct floor was shown superimposed onto contours of the streamwise fluctuating velocity on a plane close to the wall.
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