A Test Stand Study on the Volatile Emissions of a Passenger Car Brake Assembly
AbstractBrake-related airborne particulate matter contributes to urban emissions in the transport sector. Recent research demonstrated a clear dependence of the number of ultra-fine particles on the disc brake temperature. Above the so-called transition temperature, the number of ultra-fine particles increases dramatically (several magnitudes). As for exhaust emissions, part of the emissions released during braking can be in the volatile fraction. For this reason, a disc brake test stand specifically designed for aerosol research was equipped with three different aerosol sampling instruments: (i) a standard cascade impactor, (ii) a cascade impactor operating at high temperature with a heated sampling line, and (iii) a standard cascade impactor with a thermodenuder. Tests with a brake assembly representative of European passenger vehicles were executed, and the concentration of released airborne particles was determined. The results showed a decrease by several magnitudes in the concentration (in the size range of below 200 nm) using the cascade impactor operating at 180 °C with the sampling line heated to 200 °C. A further decrease in the concentration of airborne particles with size fractions below 200 nm was measured using a standard cascade impactor with a thermodenuder heated to 300 °C.
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Perricone, G.; Matĕjka, V.; Alemani, M.; Wahlström, J.; Olofsson, U. A Test Stand Study on the Volatile Emissions of a Passenger Car Brake Assembly. Atmosphere 2019, 10, 263.
Perricone G, Matĕjka V, Alemani M, Wahlström J, Olofsson U. A Test Stand Study on the Volatile Emissions of a Passenger Car Brake Assembly. Atmosphere. 2019; 10(5):263.Chicago/Turabian Style
Perricone, Guido; Matĕjka, Vlastimil; Alemani, Mattia; Wahlström, Jens; Olofsson, Ulf. 2019. "A Test Stand Study on the Volatile Emissions of a Passenger Car Brake Assembly." Atmosphere 10, no. 5: 263.
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