- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Faculty Research and Publications /
- Improved sizing of soot primary particles using mass-mobility...
Open Collections
UBC Faculty Research and Publications
Improved sizing of soot primary particles using mass-mobility measurements Dastanpour, Ramin; Rogak, Steven; Graves, Brian; Olfert, Jason; Eggersdorfer, Maximilian L.; Boies, Adam M.
Abstract
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 πa and exponent π·Ξ±). 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 πa and π·Ξ± that can be used for all conditions. However, new optimized values of πa and π·Ξ± 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 πa and π·Ξ±, 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 Metadata
Title |
Improved sizing of soot primary particles using mass-mobility measurements
|
Creator | |
Date Issued |
2016-02-01
|
Description |
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 πa and exponent π·Ξ±). 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 πa and π·Ξ± that can be used for
all conditions. However, new optimized values of πa and π·Ξ± 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 πa and π·Ξ±, 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.
|
Genre | |
Type | |
Language |
eng
|
Date Available |
2017-02-01
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
|
DOI |
10.14288/1.0314574
|
URI | |
Affiliation | |
Citation |
Dastanpour R, Rogak SN, Graves B, Olfert J, Eggersdorfer ML, Boies AM. Improved sizing of soot primary particles using mass-mobility measurements. Aerosol Sci Technol. 2016;50(2):101-109.
|
Publisher DOI |
10.1080/02786826.2015.1130796
|
Peer Review Status |
Reviewed
|
Scholarly Level |
Faculty; Postdoctoral; Graduate
|
Rights URI | |
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International