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dc.contributor.authorButterworth, Tom
dc.contributor.authorCha, Min Suk
dc.date.accessioned2020-10-06T11:02:09Z
dc.date.available2020-10-06T11:02:09Z
dc.date.issued2020-10-05
dc.date.submitted2019-10-29
dc.identifier.citationButterworth, T. D., & Cha, M. S. (2020). Electric field measurement in electric-field modified flames. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.08.019
dc.identifier.issn1540-7489
dc.identifier.doi10.1016/j.proci.2020.08.019
dc.identifier.urihttp://hdl.handle.net/10754/665457
dc.description.abstractThe application of an electric field to a flame modifies the flame characteristics due to the collective motion of charged particles generated within the flame. The applied field mobilises electrons and ions depending on their polarity, leading to localised regions of space charge with sufficient density to either locally amplify or shield the applied electric field. A fundamental understanding of the local electric field is essential for both electrically and plasma-assisted combustion, because it determines electric body force as well as electron temperature. In this work, we propose a method, which is independent of gas composition and temperature, to measure the local electric field using electric field induced second harmonic generation (E-FISH). We successfully apply this method to a laminar nonpremixed counterflow flame by applying modulated direct current (DC) electric field with a microsecond duration zero volt pulse. Electric potential and space charge distribution are also deduced from the measured electric field. Furthermore, we show the importance of electron attachment to O2 forming O2− by changing the polarity of the applied DC electric field. When the anode is in the oxygen stream, a region of negative charge is obtained near the anode, whereas, when the anode is in the fuel stream, no region of negative charge is found. We also find the qualitative trends of the measured electric fields reasonably agree with previously reported one-dimensional modelling results. The limitations of the methodology are addressed, and we show that the ability to modulate the DC voltage on sub-microsecond timescales is required for accurate quantitative measurements.
dc.description.sponsorshipThe research in this publication was supported by funding (BAS/1/1384-01-01) from King Abdullah University of Science and Technology (KAUST).
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S1540748920306039
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, [, , (2020-10-05)] DOI: 10.1016/j.proci.2020.08.019 . © 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.titleElectric field measurement in electric-field modified flames
dc.typeArticle
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentMechanical Engineering Program
dc.identifier.journalProceedings of the Combustion Institute
dc.rights.embargodate2022-10-05
dc.eprint.versionPost-print
kaust.personButterworth, Thomas Derwent
kaust.personCha, Min Suk
kaust.grant.number(BAS/1/1384-01-01)
dc.date.accepted2020-08-12
refterms.dateFOA2020-10-06T12:01:19Z
dc.date.published-online2020-10-05
dc.date.published-print2020-10


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