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Effective density of airborne particles in a railway tunnel from field measurements of mobility and aerodynamic size distributions
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-1291-8778
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-2489-0688
2018 (English)In: Aerosol Science and Technology, ISSN 0278-6826, E-ISSN 1521-7388, Vol. 52, no 8, p. 886-899Article in journal (Refereed) Published
Abstract [en]

The objective of this study is to investigate the particle effective density of aerosol measurements in a railway tunnel environment. Effective density can serve as a parameter when comparing and calibrating different aerosol measurements. It can also be used as a proxy parameter reflecting the source of particles. Effective density was determined using two different methods. Method one defined it by the ratio of mass concentration to apparent volume size distribution. Method two relied on a comparison of aerodynamic and mobility diameter size distribution measurements. The aerodynamic size range for method one was 0.006–10 µm, and for method two, it was 10–660 nm. Using the first method, a diurnal average value of about 1.87 g/cm3 was observed for the measurements with tapered element oscillating microbalance (TEOM) in tandem with aerodynamic particle sizer + scanning mobility particle sizer (SMPS), and 1.2 g/cm3 for the combination of TEOM with electrical low pressure impactor plus (ELPI+) in the presence of traffic. With method two, the effective density was 1.45 g/cm3 estimated from the size distribution measurements with ELPI + and fast mobility particle sizer (FMPS), and 1.35 g/cm3 from ELPI + in tandem with SMPS. With both calculation methods, the effective density varied for conditions with and without traffic, indicating different sources of particles. The proportion of particles with small sizes (10–660 nm) had a significant effect on the value of the effective density when no traffic was operating. The responses of different instruments to the railway particle measurements were also compared.

Place, publisher, year, edition, pages
Taylor & Francis, 2018. Vol. 52, no 8, p. 886-899
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-234236DOI: 10.1080/02786826.2018.1476750ISI: 000442403500007Scopus ID: 2-s2.0-85051125932OAI: oai:DiVA.org:kth-234236DiVA, id: diva2:1245279
Note

QC 20180906

Available from: 2018-09-04 Created: 2018-09-04 Last updated: 2019-05-21Bibliographically approved
In thesis
1. Airborne Particles in Railway Tunnels
Open this publication in new window or tab >>Airborne Particles in Railway Tunnels
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 50
Series
TRITA-MMK, ISSN 1400-1179
National Category
Environmental Engineering Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-234234 (URN)978-91-7729-916-5 (ISBN)
Public defence
2018-09-28, Gladan, Brinellvägen 85, Stockholm, 09:00 (English)
Opponent
Supervisors
Available from: 2018-09-07 Created: 2018-09-05 Last updated: 2018-09-07Bibliographically approved

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Cha, YingyingOlofsson, Ulf

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