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AERODYNAMIC CLASSIFICATION OF FIBERS WITH AEROSOL CENTRIFUGES
Citation:
Martonen, T. AND D. Johnson. AERODYNAMIC CLASSIFICATION OF FIBERS WITH AEROSOL CENTRIFUGES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/506 (NTIS PB91199927).
Description:
The constituent particles of many ambient and workplace aerosols of health effects concerns are of fibrous and aggregate geometric shapes. he sites of deposition in the human respiratory system are primarily related to the mass median aerodynamic diameters of inhaled particle size distributions. herefore, to assess potential exposure hazards it is necessary to have accurate kinetic classifications of airborne particulate matter. entrifugal spectrometers give direct and continuously graded measures of the aerodynamic size distributions of sampled aerosols. athematical description of particle behavior in spiral channel centrifuges has been presented, and substantiated by comparisons with laboratory calibration data using polystyrene latex spheres. ere, the theory is extended to non-spherical forms by incorporating appropriate dynamic particle shape resistance factors in trajectory equations. t is demonstrated how optimum centrifuge performance is made possible by the determination of favorable operating conditions permitting high-resolution characterization; specifically for fibrous aerosols.