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| Titel: |
Particle Morphology and Density Characterization by Combined Mobility and Aerodynamic Diameter Measurements. Part 2: Application to Combustion-Generated Soot Aerosols as a Function of Fuel Equivalence Ratio |
| Auteur: |
Slowik, Jay Stainken, K. Davidovits, Paul Williams, L. Jayne, J. Kolb, C. Worsnop, Douglas Rudich, Y. DeCarlo, Peter Jimenez, Jose |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 38 (2004) nr. 12 pagina's 1206-1222 |
| Jaar: |
2004-12 |
| Inhoud: |
Composition, shape factor, size, and fractal dimension of soot aerosol particles generated in a propane/O 2 flame were determined as a function of the fuel equivalence ratio (φ). Soot particles were first size-selected by a differential mobility analyzer (DMA) and then analyzed by an Aerodyne aerosol mass spectrometer (AMS). The DMA provides particles of known mobility diameter (d m ). The AMS quantitatively measures the mass spectrum of the nonrefractory components of the particles and also provides the vacuum aerodynamic diameter (d va ) corresponding to the particles of known mobility diameter. The measured d m , d va , and nonrefractory composition are used in a system of equations based on the formulation presented in the companion article to estimate the particle dynamic shape factor, total mass, and black carbon (BC) content. Fractal dimension was estimated based on the mass-mobility relationship. Two types of soot particles were observed depending on the fuel equivalence ratio. Type 1: for {φ} { 3 ). Type 2: for {φ} > 4 (high propane/O 2 ), d va was linearly proportional to d m . Analysis of the governing equations showed that these particles were nearly spherical (likely compact aggregates), with a dynamic shape factor of 1.1 (versus 1 for a sphere) and a fractal dimension of 2.95 (3 for a sphere). These particles were composed of about 50%PAH, 45%BC, and 5%aliphatic hydrocarbons (particle density=1.50 g/cm 3 ). These results help interpret some measurements obtained in recent field studies. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 10 gevonden artikelen
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