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Leader propagation speed and the final jump distance of 8 m long laboratory sparks
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Åskforskning)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Åskforskning)
2013 (English)In: Journal of Electrostatics, ISSN 0304-3886, E-ISSN 1873-5738, Vol. 71, no 3, 568-571 p.Article in journal (Refereed) Published
Abstract [en]

Vertical profile of the leader in long laboratory sparks was analyzed using high speed video photographs. Sparks were generated in an 8 m gap of sphere - plane electrodes with positive impulse voltage of 250/2500 mu s wave form. The spatial resolution of the high speed frame camera was 19.6 mm per pixel with a time resolution of 50 mu s. It was found that the average final jump distance of five sparks was about 4 m and the average electric field in the final jump region is about 5 x 10(5) V/m the leader speed varies from 1.3 x 10(4) m/s to 3.1 x 10(4) m/s as it propagates toward the ground. The average leader speed of the leader was in the order of 1.8 x 10(4) m/s. The observations show that there is a significant increase in the leader speed just before the final jump.

Place, publisher, year, edition, pages
2013. Vol. 71, no 3, 568-571 p.
Keyword [en]
Long laboratory sparks, Leader propagation, Final jump, Connecting leader, Leader propagation speed
National Category
Meteorology and Atmospheric Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Atmospheric Discharges
Identifiers
URN: urn:nbn:se:uu:diva-200325DOI: 10.1016/j.elstat.2012.12.014ISI: 000317800000075OAI: oai:DiVA.org:uu-200325DiVA: diva2:623718
Available from: 2013-05-28 Created: 2013-05-27 Last updated: 2017-12-06

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Rahman, MahbuburCooray, Vernon

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