Evidence of inter-particles collision effect in airflow resuspension of poly-dispersed non-spherical tungsten particles in monolayer deposits

Poly-dispersed particle resuspension by turbulent airflow was experimentally studied in a wind tunnel called BISE. The set-up carefully validated to produce reference airflows with three absolute pressures and friction velocities values. Monolayer deposits of poly-dispersed tungsten particles on surfaces were used for the experiments. fraction detached size bin from 1 μm 50 quantified analyze effects velocity, pressure concentration surface. Comparison results Rock'n Roll Monte-Carlo modeling revealed discrepancies behavior diameter below 4.5 μm. These could not be understood assessment particle-surface adhesion force distribution carried out Atomic Force Microscopy analysis. For surface concentrations ranging 35 100 mm−2, collision effect identified due poly-dispersion deposited Indeed, when analyzing experimental data, good linear correlation is obtained between small parameter, demonstrating that collisions responsible unexpectedly high resuspended observed diameter. data analysis presented paper show are clearly relevant should considered above-mentioned models, especially assessment.