Turbulent thermal diffusion of aerosols Academic Article uri icon


  • A new effect of turbulent thermal diffusion is discussed. This phenomenon is related to the dynamics of small inertial particles in incompressible turbulent fluid flow. Physical mechanism of the effect of turbulent thermal diffusion is associated with a correlation between velocity and temperature fluctuations in the presence of a nonzero mean temperature gradient. The latter results in additional nondiffusive flux of aerosols. At large Reynolds and Peclet numbers, the turbulent thermal diffusion is much stronger than the molecular thermal diffusion. It is shown that turbulent thermal diffusion under certain conditions can cause a large-scale instability of spatial distribution of aerosols. Aerosols are concentrated in the vicinity of the minimum (or maximum) of the mean temperature of the surrounding fluid depending on the ratio of material particle density to that of the …

publication date

  • January 1, 1996