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dc.contributor.authorGuo, Junjun
dc.contributor.authorTang, Yihao
dc.contributor.authorRaman, Venkat
dc.contributor.authorIm, Hong G.
dc.date.accessioned2021-02-22T06:14:49Z
dc.date.available2021-02-22T06:14:49Z
dc.date.issued2021-02-21
dc.date.submitted2020-10-13
dc.identifier.citationGuo, J., Tang, Y., Raman, V., & Im, H. G. (2021). Numerical investigation of pressure effects on soot formation in laminar coflow ethylene/air diffusion flames. Fuel, 292, 120176. doi:10.1016/j.fuel.2021.120176
dc.identifier.issn0016-2361
dc.identifier.doi10.1016/j.fuel.2021.120176
dc.identifier.urihttp://hdl.handle.net/10754/667541
dc.description.abstractThis study aims to provide fundamental understandings of the pressure effects on the soot formation and compare the performances of different soot aerosol models. Numerical simulations are performed in laminar coflow diffusion flames at pressures ranging from 1 to 16 bar. Two soot aerosol models are considered: the acetylene-based semi-empirical (SE) model and polycyclic aromatic hydrocarbons (PAH) based hybrid method of moment (HMOM). To study the effect of large-sized PAH species, a detailed reaction mechanism is used with PAH pathways up to coronene. Results show that the SE model provides good predictions of pressure scaling of peak soot mass with a deviation of 7%, while HMOM obtains better soot predictions on the flame centerline. Due to the shifting of PAH position towards the burner with increasing pressure, the nascent soot is formed earlier. The increase in the particle residence time is found to be an additional factor that further promotes the increased soot formation with pressure, apart from the increase in density, temperature, and PAH concentration. The residence time at 8 bar case is 2.5 times and 3.0 times longer than those at 1 bar case on the flame centerline and flame wings, respectively. Moreover, the pressure effects on the PAH contribution to the nucleation process are studied. Although small-sized PAH species (A2 and A2R5) dominate the nucleation process, the contribution of large-sized PAH species (larger than A4) increases from 5% to 20% of the total on the flame wings, when the pressure increases from 1 bar to 8 bar.
dc.description.sponsorshipThe work was sponsored by the King Abdullah University of Science and Technology (KAUST) and computational resources were provided by the KAUST Supercomputing Laboratory (KSL).
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0016236121000521
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Fuel. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fuel, [292, , (2021-02-21)] DOI: 10.1016/j.fuel.2021.120176 . © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleNumerical investigation of pressure effects on soot formation in laminar coflow ethylene/air diffusion flames
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentMechanical Engineering Program
dc.identifier.journalFuel
dc.rights.embargodate2023-02-21
dc.eprint.versionPost-print
dc.contributor.institutionUniversity of Michigan, Ann Arbor 48105, USA.
dc.identifier.volume292
dc.identifier.pages120176
kaust.personGuo, Junjun
kaust.personIm, Hong G.
dc.date.accepted2021-01-06
refterms.dateFOA2021-02-22T06:24:17Z
kaust.acknowledged.supportUnitKAUST Supercomputing Laboratory (KSL)


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