Particle deposition characteristics were observed from the aerosol sampling results of a UNICO cascade impactor. A simple model of particle motion combined with Hiemenz flow of stagnation flow on a flat plate were developed and discussed.
Both results and analysis were compared to recent models on particle bouncing errors or secondary deposition which included vortices formation around the edge of the slot, back spin (Magnus effect), and hydrodynamic conditions of the particles. The analysis was limited to a laminar inviscid and incompressible case. The main obstacle in the observation was the fact that impactor nozzles were unsymmetrical to a considerable degree, thereby deviating particle trajectory significantly from the predicted situation.
Husen, Bisma, "Aerosol Particle Bounding in Cascade Impactors" (1991). Opportunities for Undergraduate Research Experience Program (OURE). 136.