Direct comparison of pulsed spark discharges in air and water by synchronized electrical and optical diagnostics

Hans Höft, Tom Huiskamp

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Uittreksel

In this study, a direct comparison was made between pulsed spark discharges in air and water in sub-mm gaps. The discharges were ignited at atmospheric pressure in the same discharge arrangement for air and water, using a solid-state microsecond pulse source with ≈1 μs voltage rise time (Umax up to 37 kV). Fast voltage and current measurements were synchronized with iCCD imaging with high spatial resolution on symmetrical half-sphere tungsten electrodes (electrode gaps of up to 0.7 mm for air and 0.3 mm for water). The breakdown voltage and electrical field strength, maximal current, transferred charge, consumed electrical energy and discharge emission structure (e.g. discharge channel diameters) was obtained for all cases. Using the synchronization of the electrical data and the iCCD imaging, current and energy densities were estimated for the sparks in air and water. It was found that the breakdown voltage, the discharge current, the transferred charge, and the consumed electrical energy increase with the gap distance, and that this dependency is much stronger for discharges in water (compared to air). Due to the use of the same discharge arrangement and the same applied voltage, the difference in the discharge characteristics was directly quantified. Graphical abstract: [Figure not available: see fulltext.].

Originele taal-2Engels
Artikelnummer217
Aantal pagina's10
TijdschriftEuropean Physical Journal D : Atomic, Molecular and Optical Physics
Volume72
Nummer van het tijdschrift12
DOI's
StatusGepubliceerd - 1 dec 2018

Vingerafdruk

electric sparks
air
water
electrical faults
electric power
electrodes
electric potential
sparks
electrical measurement
synchronism
field strength
atmospheric pressure
tungsten
flux density
spatial resolution
current density
solid state
high resolution

Citeer dit

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Direct comparison of pulsed spark discharges in air and water by synchronized electrical and optical diagnostics. / Höft, Hans; Huiskamp, Tom.

In: European Physical Journal D : Atomic, Molecular and Optical Physics, Vol. 72, Nr. 12, 217, 01.12.2018.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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