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

Jaiswal, Surabhi and Schwabe, Mierk and Sen, Abhijit and 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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Abstract

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.

Item URL in elib:https://elib.dlr.de/122014/
Document Type:Article
Additional Information: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.
Title:Experimental investigation of dynamical structures formed due to complex plasma flowing past an obstacle
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jaiswal, SurabhiSurabhi.Jaiswal (at) dlr.deUNSPECIFIED
Schwabe, MierkMierk.Schwabe (at) dlr.dehttps://orcid.org/0000-0001-6565-5890
Sen, AbhijitInstitute For Plasma Research, IndiaUNSPECIFIED
Bandyopadhyay, P.Institute for Plasma Research, IndiaUNSPECIFIED
Date:28 September 2018
Journal or Publication Title:Physics of Plasmas
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:25
DOI :10.1063/1.5042497
Page Range:093703
Publisher:American Institute of Physics (AIP)
ISSN:1070-664X
Status:Published
Keywords:complex plasmas, dusty plasmas, flow past obstacle
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Laboratory research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Schwabe, Dr. Mierk
Deposited On:05 Oct 2018 12:44
Last Modified:06 Sep 2019 15:18

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