http://www.cnr.it/ontology/cnr/individuo/prodotto/ID90055
Effect of fuel/air ratio and aromaticity on the molecular weight distribution of soot in premixed n-heptane flames (Contributo in atti di convegno)
- Type
- Label
- Effect of fuel/air ratio and aromaticity on the molecular weight distribution of soot in premixed n-heptane flames (Contributo in atti di convegno) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Alternative label
D'Anna A., Ciajolo A., Alfè M., Apicella B., Tregrossi A. (2008)
Effect of fuel/air ratio and aromaticity on the molecular weight distribution of soot in premixed n-heptane flames
in 32nd Symposium International on Combustion, McGill University, Canada, August 3-8 (2008)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- D'Anna A., Ciajolo A., Alfè M., Apicella B., Tregrossi A. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#volumeInCollana
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Isitituto di Ricerche sulla Combustione, CNR
Dipartimento di Ingegneria Chimica,Università di Napoli Federico II (literal)
- Titolo
- Effect of fuel/air ratio and aromaticity on the molecular weight distribution of soot in premixed n-heptane flames (literal)
- Abstract
- Soot growth from inception to mass-loading is studied in a wide range of molecular weights (MW)
from 105 to 1010u by means of size exclusion chromatography (SEC) coupled with on-line UV-visible
spectroscopy. The evolution of MW distributions of soot is also numerically predicted by using a
detailed kinetic model coupled with a discrete-sectional approach for the modeling of the gas-to-particle
process. Two premixed flames burning n-heptane in slightly sooting and heavily sooting conditions
are studied. The effect of aromatic addition to the fuel is studied by adding n-propylbenzene (10% by
volume) to n-heptane in the heavily sooting condition. A progressive reduction of the MW distribution
from multimodal to unimodal is observed along the flames testifying the occurrence of particle growth
and agglomeration. These processes occur earlier in the aromatic-doped n-heptane flame due to the
overriding role of benzene on soot formation which results in bigger young soot particles. Modeled
MW distributions are in reasonable agreement with experimental data although the model predicts a
slower coagulation process particularly in the slightly sooting n-heptane flame. Given the good agreement
between model predictions and experiments, the model is used to explore the role of fuel chemistry
on MW distributions. Two flames of n-heptane and n-heptane/n-propylbenzene in heavily sooting
conditions with the same temperature profile and inert dilution are modeled. The formation of larger
soot particles is still evident in the n-heptane/n-propylbenzene flame with respect to the n-heptane flame
in the same operating conditions of temperature and dilution. In addition the model predicts a larger
formation of molecular particles in the flame containing n-propylbenzene and shows that soot inception
occurs in correspondence of their maximum formation thus indicating the importance of molecular
growth in soot inception. (literal)
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