Particle Collection Characteristic of Inertial Impactor with Single Nozzle for Aerosol Measurement

摘要

In this work, the particle collection efficiencies of inertial impactor with single nozzle for the porous substrate and flat plate in the upright and inverted directions were tested for various particle diameters and Reynolds numbers. The experimental results show that the particle collection efficiencies of inertial impactor with single nozzle for the porous substrate within the collection trap are higher and the curves are less sharp than those of the flat plate. The particle collection efficiencies of inertial impactor with single nozzle for the inverted direction were found to be near to those for the upright direction for both of the porous substrate and the flat plate. Results show that the differences between the particle collection curves of inertial impactor with single nozzle for the upright and inverted directions are not obvious at the ratio of jet to plate diameter of 0.48 for the Reynolds number of 1,954. Streamlines and particle trajectories of inertial impactor with single nozzle for the porous substrate within the collection trap were further simulated numerically to obtain the particle collection efficiencies at various particle diameters. The numerical results of the particle collection efficiencies of inertial impactor with single nozzle for the porous substrate within the collection trap are close to the experimental data.