CUED Publications database

Improved sizing of soot primary particles using mass-mobility measurements

Dastanpour, R and Rogak, SN and Graves, B and Olfert, J and Eggersdorfer, ML and Boies, AM (2016) Improved sizing of soot primary particles using mass-mobility measurements. Aerosol Science and Technology, 50. pp. 101-109. ISSN 0278-6826

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Abstract

© 2016 American Association for Aerosol Research. The properties and impacts of aggregated aerosol particles (i.e., soot, metal oxide fumes) depend on their morphology, as characterized by fractal dimension, prefactor, and primary particle diameter. The morphology may be measured directly by time-consuming ex situ microscopy or rapid but indirect in situ methods. Previously, it was found that particle mass and mobility measurements could be used for the estimation of the primary particle diameter of zirconia aggregates, using plausible assumptions related to the fractal structure (specifically, prefactor kα and exponent Dα). Since the formation and growth of zirconia aggregates are different from carbon soot, here we compare primary particle diameters measured directly from transmission electron microscopy analysis of soot particles with the diameters estimated from mass-mobility measurements. Performing extensive measurements on soot emissions from two reciprocating engines over a range of operating conditions, we found that there are no universal values of kα and Dα that can be used for all conditions. However, new optimized values of kα and Dα are estimated here for soot particles. The variation of the primary particle diameter with particle size is also taken into consideration and is shown to be essential to obtain physically realistic results. Using optimized values of kα and Dα, the average primary particle sizing error is reduced for all soot types. This suggests that with some calibration, in situ sizing of the primary particle diameter, using mass and mobility measurements, can provide useful accuracy.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:28
Last Modified: 07 Sep 2017 01:46
DOI: