Dry deposition of large, airborne particles onto a surrogate surface

Simultaneous measurements of particle dry deposition flux and airborne number concentration in the open atmosphere were made using three different types of artificially generated particles in the size range 10–100 μm – perlite, diatomaceous earth and glass beads. A combination of gravimetric analysis, automated microscopy and sonic anemometry provided size-resolved estimates of both the inertial and gravitational components of the quasi-laminar layer particle deposition velocity, (Vd)b, as a function of size. Eddy inertial deposition efficiency (ηdI) was determined as a function of dimensionless eddy Stokes number (Stke). In the range 310 μm).