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Experimental investigation of dynamical structures formed due to complex plasma flowing past an obstacle

Jaiswal, Surabhi und Schwabe, Mierk und Sen, Abhijit und Bandyopadhyay, P. (2018) Experimental investigation of dynamical structures formed due to complex plasma flowing past an obstacle. Physics of Plasmas, 25, 093703. American Institute of Physics (AIP). doi: 10.1063/1.5042497. ISSN 1070-664X.

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Kurzfassung

We report experimental observations of the dynamical behavior of a complex plasma flowing past a spherical obstacle. The investigation has been carried out in a Pi-shaped direct current glow discharge experimental device where a dust cloud of kaolin particles in a background argon plasma is made to flow in a controlled fashion by regulating the mass flow of the neutrals. A spherical metal object vertically mounted on the cathode tray acts as an obstacle to the flow. The flowing dust particles are repelled by the electrostatic field of the negatively charged sphere, and a microparticle free region (dust void) is formed surrounding the obstacle. The distant dust particles are attracted towards the floating obstacle and reflected back when they get to a certain distance, causing a ring shaped structure around the obstacle. We characterize the shape of this structure over a range of dust flow speeds and obstacle biases. For a supersonic flow of the dust fluid, a bow shock is seen to form on the upstream side of the negatively biased sphere, while the downstream side shows the generation of wave structures for a particular range of flow velocities when the Reynolds number Re>~50. The flow generated structures can be physically understood in terms of the dust dynamics under the combined influence of the ion-drag force, the neutral streaming, and the electric force.

elib-URL des Eintrags:https://elib.dlr.de/122014/
Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Physics of Plasmas 25, 093703 (2018) and may be found at https://doi.org/10.1063/1.5042497.
Titel:Experimental investigation of dynamical structures formed due to complex plasma flowing past an obstacle
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Jaiswal, SurabhiSurabhi.Jaiswal (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schwabe, MierkMierk.Schwabe (at) dlr.dehttps://orcid.org/0000-0001-6565-5890NICHT SPEZIFIZIERT
Sen, AbhijitInstitute For Plasma Research, IndiaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bandyopadhyay, P.Institute for Plasma Research, IndiaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:28 September 2018
Erschienen in:Physics of Plasmas
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:25
DOI:10.1063/1.5042497
Seitenbereich:093703
Verlag:American Institute of Physics (AIP)
ISSN:1070-664X
Status:veröffentlicht
Stichwörter:complex plasmas, dusty plasmas, flow past obstacle
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Forschung unter Weltraumbedingungen
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):R - Komplexe Plasmen / Laborforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Materialphysik im Weltraum > Gruppe Komplexe Plasmen
Hinterlegt von: Schwabe, Dr. Mierk
Hinterlegt am:05 Okt 2018 12:44
Letzte Änderung:02 Nov 2023 09:49

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