Lundgren impactor

For determination of the aerodynamic diameters of particles, the most commonly apphcable methods for particle-size analysis are those based on inertia aerosol centrifuges, cyclones, and inertial impactors (Lundgren et al.. Aerosol Measurement, University of Florida, Gainesville, 1979 and Liu, Fine Paiiicles—Aerosol Generation, Measurement, Sampling, and Analysis, Academic, New York, 1976). Impactors are the most commonly used. Nevertheless, impactor measurements are subject to numerous errors [Rao and Whitby, Am. Ind. Hyg. A.s.soc.]., 38, 174 (1977) Marple and WiUeke, "Inertial Impactors, in Lundgren et al.. Aerosol Measurement and Fuchs, "Aerosol Impactors, in Shaw, Fundamentals of Aerosol Sci-... 

Impactors with various designs as well as different types of impaction surfaces are in use (e.g., see Chow, 1995). Examples include the Lundgren impactor, the Anderson sampler, the Mercer impactor, and the Uni-... 

In the first stage of the Lundgren impactor, air issues at a flow of 85 L/min through a number of round jets 0.82 cm in diameter at a Reynolds number of 3700. 

Raabe, O.G. (1979). Design and use of the Mercer-style impactor for characterization of aerosol aerodynamic size distributions. In Lundgren, D.A., Harris Jr., F.S., Marlow, W.H.,... 

In the Lundgren cascade impactor system the fineparticles are collected on revolving drums placed opposite the impactor jets [31]. Each drum has a total surface of 10 in. In one model, each drum rotates once every 24 hours, which is a useful feature in air-pollution studies. In another version of the equipment speeds of rotation of... 

---