Abstract
The collection efficiency of impactors is affected by boundary layers along the nozzle walls and the impaction plate. A simplified hydrodynamic model which takes account of these boundary layers is presented for rectangular impactors. The model operates with a set of new parameters which characterize the flow field between the nozzle and the impaction plate. In this flow field the motion of the particles along the impactor axis is considered and a method is presented for calculating the particle cutoff diameter, which is the diameter of the largest particle with zero collection efficiency. The design and performance of a five-stage cascade impactor are described and it is shown how measurements of flow rate and pressure drops over the impactor stages can be used for calculating these parameters. Measurements of the collection efficiencies using polystyrene PSL spheres are described and it is demonstrated that the calculated cutoff diameters agree well with the experimentally determined cutoff diameters.
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