The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles

Handle URI:
http://hdl.handle.net/10754/623484
Title:
The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles
Authors:
Hamdan, Ahmad ( 0000-0001-5591-2291 ) ; Čerņevičs, Kristians; Cha, Min Suk ( 0000-0003-4059-3421 )
Abstract:
We investigated the effect of a liquid's electrical conductivity (EC) on the physical characteristics of electrical discharges in liquids with gaseous bubbles. Argon gas was supplied into the liquid to form an array of gaseous bubbles in between two electrodes (a pin-to-hollow electrode setup). Methanol and water were considered as base liquids, representing a low and a high dielectric permittivity (ϵ) liquid respectively, while potassium chloride (KCl) was added to control the EC of the liquids. When increasing the EC of the liquids, we found that the discharge probability was reduced by 46% for in-water and 38% for in-methanol discharges. We also found that the injected charge decreased by ∼4 μC as the EC increased. Moreover, as the gap distance increased from 1 to 2.5 mm, the injected charge decreased by 2 μC for in-water discharge and by 4 μC for in-methanol discharge. The plasma emission is another important parameter in characterizing discharges. With increasing the EC, the plasma emission volume decreased linearly by a factor of ∼5. The plasma lifetime was shortened by around 33% for in-water and 20% for in-methanol discharges in the case of d = 1 mm, while the decrease was 40% for in-water and 30% for in-methanol discharges in the case of d = 2.5 mm. Using the broadening characteristics of the Hα line, the electron density was estimated during the first 100 ns by ∼3 × 10 cm for in-water discharges and by ∼2 × 10 cm for in-methanol discharges, and it decreased by about one order of magnitude after 800 ns; note that n dependence on the EC was not significant. The reported findings provide further understanding of electrical discharges in bubbled liquids and highlight the influence of a liquid's EC, which are useful in the development and optimization of the applications based on such process.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Citation:
Hamdan A, Čerņevičs K, Cha MS (2017) The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles. Journal of Physics D: Applied Physics 50: 185207. Available: http://dx.doi.org/10.1088/1361-6463/aa6969.
Publisher:
IOP Publishing
Journal:
Journal of Physics D: Applied Physics
Issue Date:
27-Mar-2017
DOI:
10.1088/1361-6463/aa6969
Type:
Article
ISSN:
0022-3727; 1361-6463
Sponsors:
The research reported in this publication was supported by Competitive Research Funding from King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://iopscience.iop.org/article/10.1088/1361-6463/aa6969/meta
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.authorČerņevičs, Kristiansen
dc.contributor.authorCha, Min Suken
dc.date.accessioned2017-05-14T11:42:24Z-
dc.date.available2017-05-14T11:42:24Z-
dc.date.issued2017-03-27en
dc.identifier.citationHamdan A, Čerņevičs K, Cha MS (2017) The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles. Journal of Physics D: Applied Physics 50: 185207. Available: http://dx.doi.org/10.1088/1361-6463/aa6969.en
dc.identifier.issn0022-3727en
dc.identifier.issn1361-6463en
dc.identifier.doi10.1088/1361-6463/aa6969en
dc.identifier.urihttp://hdl.handle.net/10754/623484-
dc.description.abstractWe investigated the effect of a liquid's electrical conductivity (EC) on the physical characteristics of electrical discharges in liquids with gaseous bubbles. Argon gas was supplied into the liquid to form an array of gaseous bubbles in between two electrodes (a pin-to-hollow electrode setup). Methanol and water were considered as base liquids, representing a low and a high dielectric permittivity (ϵ) liquid respectively, while potassium chloride (KCl) was added to control the EC of the liquids. When increasing the EC of the liquids, we found that the discharge probability was reduced by 46% for in-water and 38% for in-methanol discharges. We also found that the injected charge decreased by ∼4 μC as the EC increased. Moreover, as the gap distance increased from 1 to 2.5 mm, the injected charge decreased by 2 μC for in-water discharge and by 4 μC for in-methanol discharge. The plasma emission is another important parameter in characterizing discharges. With increasing the EC, the plasma emission volume decreased linearly by a factor of ∼5. The plasma lifetime was shortened by around 33% for in-water and 20% for in-methanol discharges in the case of d = 1 mm, while the decrease was 40% for in-water and 30% for in-methanol discharges in the case of d = 2.5 mm. Using the broadening characteristics of the Hα line, the electron density was estimated during the first 100 ns by ∼3 × 10 cm for in-water discharges and by ∼2 × 10 cm for in-methanol discharges, and it decreased by about one order of magnitude after 800 ns; note that n dependence on the EC was not significant. The reported findings provide further understanding of electrical discharges in bubbled liquids and highlight the influence of a liquid's EC, which are useful in the development and optimization of the applications based on such process.en
dc.description.sponsorshipThe research reported in this publication was supported by Competitive Research Funding from King Abdullah University of Science and Technology (KAUST).en
dc.publisherIOP Publishingen
dc.relation.urlhttp://iopscience.iop.org/article/10.1088/1361-6463/aa6969/metaen
dc.rightsThis is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://doi.org/10.1088/1361-6463/aa6969en
dc.subjectdischarge in bubblesen
dc.subjectdischarge in liquidsen
dc.subjectelectrical conductivityen
dc.subjectnanosecond dischargeen
dc.subjectnanosecond imagingen
dc.titleThe effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubblesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Physics D: Applied Physicsen
dc.eprint.versionPost-printen
dc.contributor.institutionSchool of Chemistry, University of Glasgow, Joseph Black Building, Glasgow, G12 8QQ, , United Kingdomen
kaust.authorHamdan, Ahmaden
kaust.authorČerņevičs, Kristiansen
kaust.authorCha, Min Suken
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