Distribution And Penetration Efficiency Of Cylindrical Nanoparticles In Turbulent Flows Through A Curved Tube

Distribution and penetration efficiency of cylindrical nanoparticles with length of 160 nm and aspect ratio between 2 and 16 are studied numerically in turbulent flows through a curved tube in the range of Reynolds number from 4500 to 43,000, Stokes number from 0.002 to 0.026, Dean number from 1428 to 2884. The distributions of particle number concentration and particle orientation on the cross-section at different axial positions and outlet are given and analyzed. The effect of various parameters on the penetration efficiency is discussed. The results showed that the extent of non-uniformity of the distribution of particle number concentration increases with increasing Stokes number, Dean number, Reynolds number and particle aspect ratio. More particles align with their major axis near to the flow direction with the increase of the Stokes number and particle aspect ratio, than with the decrease of the Dean number and Reynolds number. The penetration efficiency increases as the Dean number, Reynolds number and particle aspect ratio decrease. However, the penetration efficiency is not a monotonic function of the Stokes number. The penetration efficiency increases and decreases with the increasing Stokes number when St < 0.02 and St > 0.02, respectively. Finally, the relationship between the penetration efficiency and related synthetic parameters is established based on the numerical data. Copyright (c) 2020 American Association for Aerosol Research