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The effective density and fractal dimension of particles emitted from a light-duty diesel vehicle with a diesel oxidation catalyst

Authors
Journal
Journal of Aerosol Science
0021-8502
Publisher
Elsevier
Publication Date
Volume
38
Issue
1
Identifiers
DOI: 10.1016/j.jaerosci.2006.10.002
Keywords
  • Diesel Soot
  • Effective Density
  • Fractal Dimension
  • Centrifugal Particle Mass Analyzer

Abstract

Abstract A differential mobility analyzer (DMA) and a Couette centrifugal particle mass analyzer (Couette CPMA) were used to measure the effective density and fractal dimension of particles emitted from a light-duty diesel vehicle fitted with a diesel oxidation catalyst (DOC). It was found that at high engine loads, the DOC increased in temperature, sulphate levels in the particulate matter increased, and a transient nucleation mode was observed. The increase in sulphate levels resulted in a drastic increase in the effective density and fractal dimension of the particles. At low engine loads (8–15%), sulphate levels were much lower, no nucleation mode was present and the fractal dimension varied from 2.22 to 2.48, which is in good agreement with previous studies. At 40% load, sulphate levels were much higher and the fractal dimension was 2.76.

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