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Effective density of airborne wear particles from car brake materials

Abstrakt

People living in urban environments are subject to high health risks due to various anthropogenic sources of airborne particulate matter, including wear of transport vehicle brakes. Studies of airborne particles often require an estimate of the effective particle density, a property that allows correct matching of mass and size characteristics measured by different aerosol instruments. In this study we investigated the effective density of airborne wear particles emitted from car brake materials. The particles were generated by a pin-on-disc machine located in a sealed chamber. Two methods were used to determine the effective density. The first method is based on measurements of PM10 and particle size distribution. The second method involves measurements and subsequent fitting of the mobility size distribution and aerodynamic size distribution. Results from the two methods showed good agreement. It was found that the effective density is 0.75±0.2 g/cm3. The particle emission, size distribution and effective density are sensitive to temperature variations. An intensive emission of ultrafine particles is initiated at the disc temperature of 185±16 °C. The effective density decreases with the temperature in the interval 110–360 °C. There is a large difference between the effective density and the density of the particle material, which suggests that the particles are porous.

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Autorzy (2)

  • Zdjęcie użytkownika dr hab. inż. Oleksii Nosko

    Oleksii Nosko dr hab. inż.

    • KTH Royal Institute of Technology
  • Zdjęcie użytkownika  Ulf Olofsson

    Ulf Olofsson

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
JOURNAL OF AEROSOL SCIENCE nr 107, strony 94 - 106,
ISSN: 0021-8502
Język:
angielski
Rok wydania:
2017
Opis bibliograficzny:
Nosko O., Olofsson U.: Effective density of airborne wear particles from car brake materials// JOURNAL OF AEROSOL SCIENCE -Vol. 107, (2017), s.94-106
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.jaerosci.2017.02.014
Weryfikacja:
Politechnika Gdańska

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