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dc.contributor.authorVan, Kyu Ho
dc.contributor.authorOh, Su Hyeon
dc.contributor.authorCha, Min Suk
dc.contributor.authorYoo, Chun Sang
dc.contributor.authorPark, Jeong
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2020-09-10T11:40:51Z
dc.date.available2020-09-10T11:40:51Z
dc.date.issued2020-09-08
dc.date.submitted2019-11-02
dc.identifier.citationVan, K. H., Oh, S. H., Cha, M. S., Yoo, C. S., Park, J., & Chung, S. H. (2020). Effects of Schmidt number on non-monotonic liftoff height behavior in laminar coflow-jet flames with diluted methane and ethylene. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.344
dc.identifier.issn1540-7489
dc.identifier.doi10.1016/j.proci.2020.06.344
dc.identifier.urihttp://hdl.handle.net/10754/665062
dc.description.abstractStabilization characteristics of laminar lifted jet flames in a coflow were investigated experimentally to elucidate the effect of Schmidt number in methane and ethylene fuels diluted with N 2 , He, and Ar. A non- monotonic (decreasing and then increasing) liftoff height ( H L ) behavior with jet velocity ( U 0 ) was observed previously for methane fuel diluted with N 2 . To further elucidate the fuel Schmidt number (Sc F ) effect in exhibiting such a non-monotonic (U-shaped) behavior, various diluents (N 2 , He, and Ar) were added to the fuel streams and methane and/or ethylene fuels were used. The result showed three flame types in terms of Sc F and fuel density; nozzle-attached flame, stationary lifted flame, and oscillating flame. Among sta- tionary lifted flames, two distinct H L behaviors with U 0 were observed; monotonic and non-monotonic H L behaviors. A critical Schmidt number (Sc F,cr1 ) existed over which monotonically increasing behavior was ob- served. A second critical Schmidt number (Sc F,cr2 ) also existed such that U-shaped behavior was observed for Sc F,cr2 < Sc F < Sc F,cr1 . An oscillating lifted flame was observed for Sc F < Sc F,cr2 . The oscillating and stationary lifted flames can be categorized in terms of the density differences among the fuel, air, and burnt gas. For the increasing H L cases (including the increasing regime in U-shaped behavior), H L behavior can be char- acterized in terms of Sc F , the density difference between fuel and air, Sc F,cr1 , and U 0 . While the decreasing H L regime in the U-shaped behavior can be characterized with Sc F and/or the Richardson number (defined based on the density difference between fuel and air). Oscillating flames were observed with the frequency range of 2.1–2.7 Hz by the repetitive action of positive (by burnt gas) and negative (when the fuel heavier than air) buoyancies.
dc.description.sponsorshipThis work was conducted under the framework of the Research and Development Program of the Korea Institute of Energy Research (B9-2431). CSY was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2018R1A2A2A05018901). SHC & MSC were supported by the King Abdullah University of Science and Technology (KAUST).
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S1540748920304375
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Proceedings of the Combustion Institute. 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 Proceedings of the Combustion Institute, [, , (2020-09-08)] DOI: 10.1016/j.proci.2020.06.344 . © 2020. 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.titleEffects of Schmidt number on non-monotonic liftoff height behavior in laminar coflow-jet flames with diluted methane and ethylene
dc.typeArticle
dc.contributor.departmentCombustion and Laser Diagnostics Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalProceedings of the Combustion Institute
dc.rights.embargodate2022-09-08
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Mechanical Engineering, Pukyong National University, Busan, South Korea.
dc.contributor.institutionDepartment of Mechanical Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea.
kaust.personCha, Min Suk
kaust.personChung, Suk Ho
dc.date.accepted2020-06-28
refterms.dateFOA2020-09-13T05:31:26Z
dc.date.published-online2020-09-08
dc.date.published-print2020-09


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