Nanosecond Discharge in Bubbled Liquid n-Heptane: Effects of Gas Composition and Water Addition

Handle URI:
http://hdl.handle.net/10754/622570
Title:
Nanosecond Discharge in Bubbled Liquid n-Heptane: Effects of Gas Composition and Water Addition
Authors:
Hamdan, Ahmad ( 0000-0001-5591-2291 ) ; Cha, Min Suk ( 0000-0003-4059-3421 )
Abstract:
Recently, an aqueous discharge reactor was developed to facilitate reformation of liquid fuels by in-liquid plasma. To gain a microscopic understanding of the physical elements behind this aqueous reactor, we investigate nanosecond discharges in liquid n-heptane with single and double gaseous bubbles in the gap between electrodes. We introduce discharge probability (DP) to characterize the stochastic nature of the discharges, and we investigate the dependence of DP on the gap distance, applied voltage, gaseous bubble composition, and the water content in n-heptane/distilled-water emulsified mixtures. Propagation of a streamer through the bubbles indicates no discharges in the liquids. DP is controlled by the properties of the gaseous bubble rather than by the composition of the liquid mixture in the gap with a single bubble; meanwhile, DP is determined by the dielectric permittivity of the liquid mixture in the gap with double bubbles, results that are supported by static electric field simulations. We found that a physical mechanism of increasing DP is caused by an interaction between bubbles and an importance of the dielectric permittivity of a liquid mixture on the local enhancement of field intensity. We also discuss detailed physical characteristics, such as plasma lifetime and electron density within the discharge channel, by estimating from measured emissions with a gated-intensified charge-coupled device and by using spectroscopic images, respectively. © 1973-2012 IEEE.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Citation:
Hamdan A, Cha MS (2016) Nanosecond Discharge in Bubbled Liquid n-Heptane: Effects of Gas Composition and Water Addition. IEEE Transactions on Plasma Science 44: 2988–2994. Available: http://dx.doi.org/10.1109/TPS.2016.2601936.
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
IEEE Transactions on Plasma Science
Issue Date:
30-Aug-2016
DOI:
10.1109/TPS.2016.2601936
Type:
Article
ISSN:
0093-3813; 1939-9375
Additional Links:
http://ieeexplore.ieee.org/document/7556309/
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorHamdan, Ahmaden
dc.contributor.authorCha, Min Suken
dc.date.accessioned2017-01-02T09:55:30Z-
dc.date.available2017-01-02T09:55:30Z-
dc.date.issued2016-08-30en
dc.identifier.citationHamdan A, Cha MS (2016) Nanosecond Discharge in Bubbled Liquid n-Heptane: Effects of Gas Composition and Water Addition. IEEE Transactions on Plasma Science 44: 2988–2994. Available: http://dx.doi.org/10.1109/TPS.2016.2601936.en
dc.identifier.issn0093-3813en
dc.identifier.issn1939-9375en
dc.identifier.doi10.1109/TPS.2016.2601936en
dc.identifier.urihttp://hdl.handle.net/10754/622570-
dc.description.abstractRecently, an aqueous discharge reactor was developed to facilitate reformation of liquid fuels by in-liquid plasma. To gain a microscopic understanding of the physical elements behind this aqueous reactor, we investigate nanosecond discharges in liquid n-heptane with single and double gaseous bubbles in the gap between electrodes. We introduce discharge probability (DP) to characterize the stochastic nature of the discharges, and we investigate the dependence of DP on the gap distance, applied voltage, gaseous bubble composition, and the water content in n-heptane/distilled-water emulsified mixtures. Propagation of a streamer through the bubbles indicates no discharges in the liquids. DP is controlled by the properties of the gaseous bubble rather than by the composition of the liquid mixture in the gap with a single bubble; meanwhile, DP is determined by the dielectric permittivity of the liquid mixture in the gap with double bubbles, results that are supported by static electric field simulations. We found that a physical mechanism of increasing DP is caused by an interaction between bubbles and an importance of the dielectric permittivity of a liquid mixture on the local enhancement of field intensity. We also discuss detailed physical characteristics, such as plasma lifetime and electron density within the discharge channel, by estimating from measured emissions with a gated-intensified charge-coupled device and by using spectroscopic images, respectively. © 1973-2012 IEEE.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.relation.urlhttp://ieeexplore.ieee.org/document/7556309/en
dc.subjectFuel reformingen
dc.subjectnanosecond dischargeen
dc.subjectnanosecond imagingen
dc.subjectplasma in bubblesen
dc.subjectplasma in dielectric liquids.en
dc.titleNanosecond Discharge in Bubbled Liquid n-Heptane: Effects of Gas Composition and Water Additionen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalIEEE Transactions on Plasma Scienceen
kaust.authorHamdan, Ahmaden
kaust.authorCha, Min Suken
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