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- W591038478 abstract "Diesel exhaust aerosol particle size measurements were made using techniques based on electrical mobility, diffusion, and inertial separation. Particle samples were also examined by electron microscopy, and volatile fractions were determined by vacuum sublimation. Measurements involved a direct injection engine and an indirect injection swirl chamber engine. Engine operating conditions were chosen to give a wide range of exhaust particle characteristics. Results demonstrated that number size distributions and number mean diameters obtained with an electrical aerosol analyzer and a diffusion battery system were in good agreement for various diesel exhaust aerosols. Submicrometer-diameter mass fractions measured with a micro-orifice impactor agreed well with submicrometer-volume fractions determined using the electrical aerosol analyzer, although mass fractions were slightly higher than volume fractions. Most of this difference probably resulted from particle bounce and density-related effects rather than from fundamental differences between sizing characteristics of the two instruments. Engine and operating conditions leading to the formation of particles with a high volatile fraction also produced high concentrations of submicrometer-diameter particles. Electron microscope photographs showed that significant fraction of these particles were spherical. They were apparently formed by the condensation of volatile materials sometime during the engine expansion, exhaust, or dilution process." @default.
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- W591038478 date "1980-02-01" @default.
- W591038478 modified "2023-10-16" @default.
- W591038478 title "Diesel Exhaust Particle Size Distribution Measurement Techniques" @default.
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- W591038478 doi "https://doi.org/10.4271/800187" @default.
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