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- W2007078483 abstract "Abstract Particle effective eddy diffusion coefficients, ϵ/ν, [(inertial + diffusion)/viscous forces], were calculated from experimental deposition fluxes to a smooth horizontal surface. The ϵ/ν are a function of both particle inertia (τ+), the distance from the surface (y+), and the air friction velocity ( u ∗ ) which is contained in both dimensionless terms. These ϵ/ν are greater than the ϵ/ν for particle deposition along a vertical surface. Both correlations show that particle effective eddy diffusion coefficients are much greater than the eddy diffusion of air momentum for distances from the surface of y+ 350. These ϵ/ν are similar to those for air momentum transfer. The effective eddy diffusivities are combined with Brownian diffusion and gravity settling to predict particle deposition velocities for particle size from 10−3 to 102 μm diameter for particle densities of 1 and 10 gm/cm3. Each of these mechanisms of particle transport controls the predicted deposition in some range of particle size. The deposition velocities show minima of 1.8 × 10−4 to 7.7 × 10−3 cm/sec for particle sizes from 0.066 to 0.54 μm. The minima as well as all deposition velocities are equal to or much greater than predicted from gravitational settling." @default.
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- W2007078483 date "1971-12-01" @default.
- W2007078483 modified "2023-10-18" @default.
- W2007078483 title "Particle diffusivities and deposition velocities over a horizontal smooth surface" @default.
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- W2007078483 doi "https://doi.org/10.1016/0021-9797(71)90370-5" @default.
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