Simultaneous measurements of acetylene and soot during the pyrolysis of ethylene and benzene in a shock tube

Handle URI:
http://hdl.handle.net/10754/622335
Title:
Simultaneous measurements of acetylene and soot during the pyrolysis of ethylene and benzene in a shock tube
Authors:
KC, Utsav; Beshir, Mohamed; Farooq, Aamir ( 0000-0001-5296-2197 )
Abstract:
Acetylene is one of the most important precursors of soot and contributes to soot growth by the hydrogen-abstraction acetylene-addition (HACA) mechanism. In this work, we undertake time-resolved simultaneous measurements of acetylene and soot behind reflected shock waves at temperatures of 1600-2200. K and pressures of 3-5. bar. Acetylene mole fraction time-histories are measured from the absorption of a quantum-cascade laser operating around 13.6. μm. The soot volume fraction, particle size and number densities are calculated from the extinction and scattering of a cw Nd:Yag laser at 532. nm. Acetylene and soot are generated from the pyrolysis of 1% benzene in argon, 2.35% ethylene in argon, and binary mixtures of ethylene with propane/methane in argon. We note that acetylene time-histories exhibit a two-stage growth during the pyrolysis of benzene, which can be correlated to the initial rapid increase of soot volume fraction and a later plateauing. In comparison to ethylene pyrolysis, the pyrolysis of benzene results in larger values of the soot volume fraction, particle diameter and number density. We compare the measured data against the values simulated using the method-of-moments routine in Chemkin-Pro and a detailed PAH mechanism based on KM2 [1] and AramcoMech 1.3 [2]. Large discrepancies are observed between the measured and predicted values of the soot parameters. The data obtained from our experiments may assist future validation and development of soot mechanisms.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Citation:
KC U, Beshir M, Farooq A (2016) Simultaneous measurements of acetylene and soot during the pyrolysis of ethylene and benzene in a shock tube. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.08.087.
Publisher:
Elsevier BV
Journal:
Proceedings of the Combustion Institute
Issue Date:
12-Oct-2016
DOI:
10.1016/j.proci.2016.08.087
Type:
Article
ISSN:
1540-7489
Sponsors:
King Abdullah University of Science and Technology
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorKC, Utsaven
dc.contributor.authorBeshir, Mohameden
dc.contributor.authorFarooq, Aamiren
dc.date.accessioned2017-01-02T09:08:26Z-
dc.date.available2017-01-02T09:08:26Z-
dc.date.issued2016-10-12en
dc.identifier.citationKC U, Beshir M, Farooq A (2016) Simultaneous measurements of acetylene and soot during the pyrolysis of ethylene and benzene in a shock tube. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.08.087.en
dc.identifier.issn1540-7489en
dc.identifier.doi10.1016/j.proci.2016.08.087en
dc.identifier.urihttp://hdl.handle.net/10754/622335-
dc.description.abstractAcetylene is one of the most important precursors of soot and contributes to soot growth by the hydrogen-abstraction acetylene-addition (HACA) mechanism. In this work, we undertake time-resolved simultaneous measurements of acetylene and soot behind reflected shock waves at temperatures of 1600-2200. K and pressures of 3-5. bar. Acetylene mole fraction time-histories are measured from the absorption of a quantum-cascade laser operating around 13.6. μm. The soot volume fraction, particle size and number densities are calculated from the extinction and scattering of a cw Nd:Yag laser at 532. nm. Acetylene and soot are generated from the pyrolysis of 1% benzene in argon, 2.35% ethylene in argon, and binary mixtures of ethylene with propane/methane in argon. We note that acetylene time-histories exhibit a two-stage growth during the pyrolysis of benzene, which can be correlated to the initial rapid increase of soot volume fraction and a later plateauing. In comparison to ethylene pyrolysis, the pyrolysis of benzene results in larger values of the soot volume fraction, particle diameter and number density. We compare the measured data against the values simulated using the method-of-moments routine in Chemkin-Pro and a detailed PAH mechanism based on KM2 [1] and AramcoMech 1.3 [2]. Large discrepancies are observed between the measured and predicted values of the soot parameters. The data obtained from our experiments may assist future validation and development of soot mechanisms.en
dc.description.sponsorshipKing Abdullah University of Science and Technologyen
dc.publisherElsevier BVen
dc.subjectAcetyleneen
dc.subjectLaser absorptionen
dc.subjectScatteringen
dc.subjectShock tubeen
dc.subjectSooten
dc.titleSimultaneous measurements of acetylene and soot during the pyrolysis of ethylene and benzene in a shock tubeen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalProceedings of the Combustion Instituteen
kaust.authorKC, Utsaven
kaust.authorBeshir, Mohameden
kaust.authorFarooq, Aamiren
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