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- W2007115909 abstract "Direct numerical simulations of particle dispersion in the turbulent natural convection flow between two vertical walls kept at constant but different temperatures are reported. It is assumed that the particles do not affect the flow (i.e. the dilute phase approximation is adopted). Particles with different levels of inertia, or Stokes numbers (0.843≤ St ≤17.45), are tracked according to the drag force imposed by the fluid. The gravity force is included for two cases, St =0.843 and St =17.45. The different levels of turbulence near the wall and near the center of the channel produce, as in isothermal turbulent channel or pipe flow, a larger concentration of particles near the wall. This effect becomes more important, and the deposition velocity of particles on the wall increases, as the particle inertia is increased. The simulations at St =8.38 and St =17.45 predict similar concentration profiles and deposition velocities according to the large inertia of these particles. The deposition velocities, obtained when the gravity force is ignored in the particle equations, follow the trend observed and measured for isothermal turbulent channel flows in the diffusion impaction regime. For the conditions considered, the gravity vector imposes a strong descending motion on the particles and this produces the increase of the particle concentration near the wall and a reduction of the deposition velocities in comparison with the results without the gravity force. ► Particle dispersion in turbulent natural convection channel flow has been simulated. ► Turbulence produces a larger concentration of particles near the walls. ► Predictions of the deposition velocities are in the diffusion impaction regime. ► These predictions follow the same trend as in isothermal turbulent channel flow. ► Gravity reduces the deposition velocities and the particle velocity fluctuations." @default.
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- W2007115909 date "2012-01-01" @default.
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- W2007115909 title "Particle dispersion in a turbulent natural convection channel flow" @default.
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- W2007115909 doi "https://doi.org/10.1016/j.jaerosci.2011.09.002" @default.
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