Abstract
To investigate a relation between fine scale eddies and particle dispersion in a near-wall turbulence, direct numerical simulations of turbulent channel flow laden particle are performed for Re<SUB>τ</SUB>=180. The motions of 0.8 million particles are calculated for several particle response times (t<SUB>p</SUB>) which is the particle response time based on stokes’ friction law. The number density of particles has a tendency to increase with approaching the near-wall regions (y?＜20) except for cases of very small and large particle response times (i.e. t<SUB>p</SUB>=0.02 and 15). Near the wall, the behavior and distribution of particles are deeply associated with the fine scale eddies, and are dependent on particle response times and a distance from the wall. The Stokes number that causes preferential distribution in turbulence is changed by a distance from the wall. The influential Stokes number based on the Burgers’ vortex model is derived by using the time scale of the fine scale eddies. The influential Stokes number is also dependent on a distance from the wall and shows large value in the buffer layer.
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