Elongation and branching of stem channels produced by positive streamers in long air gaps

Abstract The elongation and branching of long positive spark discharges in the laboratory and in lightning have been attributed to the formation of thermalized channels inside a diffuse, glow-like streamer section at the leader head. It is experimentally shown here that the structured morphology of...

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Autores principales:	Xiangen Zhao, Marley Becerra, Yongchao Yang, Junjia He
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a95ed70047234d04a51e1dcdc3db20f9
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spelling	oai:doaj.org-article:a95ed70047234d04a51e1dcdc3db20f92021-12-02T12:11:12ZElongation and branching of stem channels produced by positive streamers in long air gaps10.1038/s41598-021-83816-72045-2322https://doaj.org/article/a95ed70047234d04a51e1dcdc3db20f92021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83816-7https://doaj.org/toc/2045-2322Abstract The elongation and branching of long positive spark discharges in the laboratory and in lightning have been attributed to the formation of thermalized channels inside a diffuse, glow-like streamer section at the leader head. It is experimentally shown here that the structured morphology of streamers produce low-density stem channels that elongate and branch well before a new leader channel section is formed. These non-thermalized stems are also shown to develop ahead of a developing leader channel. These findings are based on high-speed photography and Schlieren imaging used to visualize both the morphology of streamer filaments and stem channels. Numerical analysis is also performed to estimate the axial temperature and density of the stem channels. A stem-driven mechanism for the propagation and branching of positive long air gap discharges is proposed and discussed based on the presence of not-yet thermalized, low density channels formed by streamer ensembles at the leader head.Xiangen ZhaoMarley BecerraYongchao YangJunjia HeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xiangen Zhao Marley Becerra Yongchao Yang Junjia He Elongation and branching of stem channels produced by positive streamers in long air gaps
description	Abstract The elongation and branching of long positive spark discharges in the laboratory and in lightning have been attributed to the formation of thermalized channels inside a diffuse, glow-like streamer section at the leader head. It is experimentally shown here that the structured morphology of streamers produce low-density stem channels that elongate and branch well before a new leader channel section is formed. These non-thermalized stems are also shown to develop ahead of a developing leader channel. These findings are based on high-speed photography and Schlieren imaging used to visualize both the morphology of streamer filaments and stem channels. Numerical analysis is also performed to estimate the axial temperature and density of the stem channels. A stem-driven mechanism for the propagation and branching of positive long air gap discharges is proposed and discussed based on the presence of not-yet thermalized, low density channels formed by streamer ensembles at the leader head.
format	article
author	Xiangen Zhao Marley Becerra Yongchao Yang Junjia He
author_facet	Xiangen Zhao Marley Becerra Yongchao Yang Junjia He
author_sort	Xiangen Zhao
title	Elongation and branching of stem channels produced by positive streamers in long air gaps
title_short	Elongation and branching of stem channels produced by positive streamers in long air gaps
title_full	Elongation and branching of stem channels produced by positive streamers in long air gaps
title_fullStr	Elongation and branching of stem channels produced by positive streamers in long air gaps
title_full_unstemmed	Elongation and branching of stem channels produced by positive streamers in long air gaps
title_sort	elongation and branching of stem channels produced by positive streamers in long air gaps
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a95ed70047234d04a51e1dcdc3db20f9
work_keys_str_mv	AT xiangenzhao elongationandbranchingofstemchannelsproducedbypositivestreamersinlongairgaps AT marleybecerra elongationandbranchingofstemchannelsproducedbypositivestreamersinlongairgaps AT yongchaoyang elongationandbranchingofstemchannelsproducedbypositivestreamersinlongairgaps AT junjiahe elongationandbranchingofstemchannelsproducedbypositivestreamersinlongairgaps
_version_	1718394648717688832

Elongation and branching of stem channels produced by positive streamers in long air gaps

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