  We study experimentally turbulent thermal diffusion of small particles in
inhomogeneous and anisotropic stably stratified turbulence produced by one
oscillating grid in the air flow. The velocity fields have been measured using
a Particle Image Velocimetry (PIV). We have determined various turbulence
characteristics: the mean and turbulent velocities, two-point correlation
functions of the velocity field and an integral scale of turbulence from the
measured velocity fields. The temperature field have been measured with a
temperature probe equipped with 12 E thermocouples. Spatial distributions of
micron size particles have been determined by a PIV system using the effect of
the Mie light scattering by particles in the flow. The experiments have
demonstrated that particles are accumulated at the minimum of mean fluid
temperature due to phenomenon of turbulent thermal diffusion. Using measured
spatial distributions of particles and temperature fields, we have determined
the effective turbulent thermal diffusion coefficient of particles in
inhomogeneous temperature stratified turbulence. This experimental study has
clearly detected phenomenon of turbulent thermal diffusion in inhomogeneous
turbulence.
