Experimental study of turbulent transport of nanoparticles in convective turbulence

We perform experimental study of turbulent transport nanoparticles in convective turbulence with the Rayleigh number $\sim 10^8$ air flow. measure temperature field many locations by a probe equipped 11 E-thermocouples. Nanoparticles size 70$ nm diameter are produced Advanced Electrospray Aerosol Generator. To determine density nanoparticles, we use Condensation Particle Counter. demonstrate that joint action effects (which important core flow) and molecular essential near boundaries chamber) results an effective accumulation at cold wall chamber. The characterised diffusion thermal while described Brownian thermophoresis, as well adhesion In different experiments chamber difference $\Delta T$ between bottom top walls varying T= 29$ K to 61$ K, find mean decreases exponentially time. For instance, characteristic decay time varies from 12.8 min for 24 K. better understanding results, one-dimensional mean-field numerical simulations evolution conditions pertinent laboratory experiments. obtained good agreement results.