Detection of the phenomenon of turbulent thermal diffusion in simulations
by
Prof.Igor Rogachevskii(Ben-Gurion University of the Negev)
→
Europe/Stockholm
122:026
122:026
Description
The phenomenon of turbulent thermal diffusion causing a non-diffusive
turbulent flux of particles in the direction of the turbulent heat flux, is
found using direct numerical simulations (DNS) in temperature-stratified
turbulence.
In simulations with and without gravity, a peak in the particle number density
is found around the minimum of the mean fluid temperature for small Stokes
numbers due to the phenomenon of turbulent thermal diffusion.
This implies that this phenomenon causes formation of large-scale
inhomogeneities in the spatial distribution of particles.
For Stokes numbers St >1, this effect decreases with increasing
Stokes number.
