Effects of DME mixing on number density and size properties of soot particles in counterflow non-premixed ethylene flames

Handle URI:
http://hdl.handle.net/10754/564162
Title:
Effects of DME mixing on number density and size properties of soot particles in counterflow non-premixed ethylene flames
Authors:
Choi, J. H.; Choi, B. C.; Lee, S. M.; Chung, Suk-Ho ( 0000-0001-8782-312X ) ; Jung, K. S.; Jeong, W. L.; Choi, S. K.; Park, S. K.
Abstract:
In order to investigate the effect of DME mixing on the number density and size of soot particles, DME was mixed in a counter flow non-premixed ethylene flame with mixture ratios of 5%, 14% and 30%. A laser extinction/scattering technique has been adopted to measure the volume fraction, number density, and mean size of soot particles. The experimental results showed that the highest soot concentrations were observed for flames with mixture ratios of 5% and 14%; however, for a mixture ratio of 30% the soot concentration decreased. Numerical results showed that the concentrations of propargyl radicals (C3H3) at the 5% and 14% ratios were higher than those measured in the ethylene-based flame, and the production of benzene (C6H6) in the 5% and 14% DME mixture flames was also increased. This indicates the crucial role of propargyl in benzene ring formation. These reactions generally become stronger with increased DME mixing, except for A1- + H2 → A1 + H (-R554) and n-C4H5 + C2H2 → A1 + H (R542). Therefore, it is indicated that adding DME to ethylene flames promotes benzene ring formation. Note that although the maximum C6H6 concentration is largest in the 30% DME mixing flame, the soot volume fraction is smaller than those for the 5% and 14% mixture ratios. This is because the local C6H6 concentration decreases in the relatively low temperature region in the fuel side where soot growth occurs. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Combustion and Laser Diagnostics Laboratory
Publisher:
Springer Nature
Journal:
Journal of Mechanical Science and Technology
Issue Date:
May-2015
DOI:
10.1007/s12206-015-0447-9
Type:
Article
ISSN:
1738494X
Sponsors:
This Work was supported by National Research Foundation of Korea funded by the Korean Government (2010-0004022).
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorChoi, J. H.en
dc.contributor.authorChoi, B. C.en
dc.contributor.authorLee, S. M.en
dc.contributor.authorChung, Suk-Hoen
dc.contributor.authorJung, K. S.en
dc.contributor.authorJeong, W. L.en
dc.contributor.authorChoi, S. K.en
dc.contributor.authorPark, S. K.en
dc.date.accessioned2015-08-03T12:34:39Zen
dc.date.available2015-08-03T12:34:39Zen
dc.date.issued2015-05en
dc.identifier.issn1738494Xen
dc.identifier.doi10.1007/s12206-015-0447-9en
dc.identifier.urihttp://hdl.handle.net/10754/564162en
dc.description.abstractIn order to investigate the effect of DME mixing on the number density and size of soot particles, DME was mixed in a counter flow non-premixed ethylene flame with mixture ratios of 5%, 14% and 30%. A laser extinction/scattering technique has been adopted to measure the volume fraction, number density, and mean size of soot particles. The experimental results showed that the highest soot concentrations were observed for flames with mixture ratios of 5% and 14%; however, for a mixture ratio of 30% the soot concentration decreased. Numerical results showed that the concentrations of propargyl radicals (C3H3) at the 5% and 14% ratios were higher than those measured in the ethylene-based flame, and the production of benzene (C6H6) in the 5% and 14% DME mixture flames was also increased. This indicates the crucial role of propargyl in benzene ring formation. These reactions generally become stronger with increased DME mixing, except for A1- + H2 → A1 + H (-R554) and n-C4H5 + C2H2 → A1 + H (R542). Therefore, it is indicated that adding DME to ethylene flames promotes benzene ring formation. Note that although the maximum C6H6 concentration is largest in the 30% DME mixing flame, the soot volume fraction is smaller than those for the 5% and 14% mixture ratios. This is because the local C6H6 concentration decreases in the relatively low temperature region in the fuel side where soot growth occurs. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.en
dc.description.sponsorshipThis Work was supported by National Research Foundation of Korea funded by the Korean Government (2010-0004022).en
dc.publisherSpringer Natureen
dc.subjectCounterflow non-premixed flameen
dc.subjectDMEen
dc.subjectLaser extinctionen
dc.subjectLaser scatteringen
dc.subjectSooten
dc.subjectSoot volume fractionen
dc.titleEffects of DME mixing on number density and size properties of soot particles in counterflow non-premixed ethylene flamesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentCombustion and Laser Diagnostics Laboratoryen
dc.identifier.journalJournal of Mechanical Science and Technologyen
dc.contributor.institutionDivision of Marine System Engineering, Korea Maritime and Ocean UniversityBusan, South Koreaen
dc.contributor.institutionShip & Plant Research Team, Korean Register of ShippingSeoul, South Koreaen
dc.contributor.institutionEnvironmental and Energy Systems Research Division, Korea Institute of Machinery & MaterialsDaejeon, South Koreaen
dc.contributor.institutionSea Training Center, Korea Maritime and Ocean UniversityBusan, South Koreaen
dc.contributor.institutionMaritime Industry Research Institute, Korea Maritime and Ocean UniversityBusan, South Koreaen
dc.contributor.institutionDivision of Marine Information Technology, Korea Maritime and Ocean UniversityBusan, South Koreaen
kaust.authorChung, Suk-Hoen
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