Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
Possible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interact...
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doaj-1f5e8b59f99a4090b52c2249c21134972021-01-10T00:03:23ZengMDPI AGMolecules1420-30492021-01-012630830810.3390/molecules26020308Possible Mechanisms of String Formation in Complex Plasmas at Elevated PressuresVictoria Yaroshenko0Mikhail Pustylnik1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Wessling, GermanyInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Wessling, GermanyPossible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interaction energy is addressed by two different approaches: (i) using the dynamically screened wake potential for small Mach numbers derived by Kompaneets et al., in 2016, and (ii) introducing effect of polarization of the trapped ion cloud by discharge electric fields. Is is found that both approaches yield the particle interaction energy which is independent of the operational discharge mode. In the parameter space of the performed experiments, the first approach can provide onset of the particle attraction and string formation only at gas pressures higher than 40–45 Pa, whilst the mechanism based on the trapped ion effect yields attraction in the experimentally important pressure range 20–40 Pa and may reconcile theory and observations.https://www.mdpi.com/1420-3049/26/2/308structural properties of fluidsplasma-related fluidsstring fluidscomplex plasmaselectrorheological plasmasinteraction potential |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Victoria Yaroshenko Mikhail Pustylnik |
spellingShingle |
Victoria Yaroshenko Mikhail Pustylnik Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures Molecules structural properties of fluids plasma-related fluids string fluids complex plasmas electrorheological plasmas interaction potential |
author_facet |
Victoria Yaroshenko Mikhail Pustylnik |
author_sort |
Victoria Yaroshenko |
title |
Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures |
title_short |
Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures |
title_full |
Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures |
title_fullStr |
Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures |
title_full_unstemmed |
Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures |
title_sort |
possible mechanisms of string formation in complex plasmas at elevated pressures |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2021-01-01 |
description |
Possible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interaction energy is addressed by two different approaches: (i) using the dynamically screened wake potential for small Mach numbers derived by Kompaneets et al., in 2016, and (ii) introducing effect of polarization of the trapped ion cloud by discharge electric fields. Is is found that both approaches yield the particle interaction energy which is independent of the operational discharge mode. In the parameter space of the performed experiments, the first approach can provide onset of the particle attraction and string formation only at gas pressures higher than 40–45 Pa, whilst the mechanism based on the trapped ion effect yields attraction in the experimentally important pressure range 20–40 Pa and may reconcile theory and observations. |
topic |
structural properties of fluids plasma-related fluids string fluids complex plasmas electrorheological plasmas interaction potential |
url |
https://www.mdpi.com/1420-3049/26/2/308 |
work_keys_str_mv |
AT victoriayaroshenko possiblemechanismsofstringformationincomplexplasmasatelevatedpressures AT mikhailpustylnik possiblemechanismsofstringformationincomplexplasmasatelevatedpressures |
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