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Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak, Sergey and Thomas, Hubertus (2015) Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas. Physical Review E, 91, 033110. American Physical Society. DOI: 10.1103/PhysRevE.91.033110 ISSN 1539-3755

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The conventional fluid description of multicomponent plasma, supplemented by an appropriate equation of state for the macroparticle component, is used to evaluate the longitudinal sound velocity of Yukawa fluids. The obtained results are in very good agreement with those obtained earlier employing the quasilocalized charge approximation and molecular dynamics simulations in a rather broad parameter regime. Thus, a simple yet accurate tool to estimate the sound velocity across coupling regimes is proposed, which can be particularly helpful in estimating the dust-acoustic velocity in strongly coupled dusty (complex) plasmas. It is shown that, within the present approach, the sound velocity is completely determined by particle-particle correlations and the neutralizingmedium (plasma), apart from providing screening of the Coulomb interaction, has no other effect on the sound propagation. The ratio of the actual sound velocity to its “ideal gas” (weak coupling) scale only weakly depends on the coupling strength in the fluid regime but exhibits a pronounced decrease with the increase of the screening strength. The limitations of the present approach in applications to real complex plasmas are briefly discussed.

Item URL in elib:https://elib.dlr.de/95793/
Document Type:Article
Title:Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Khrapak, SergeyDLR, Sergey.Khrapak (at) dlr.deUNSPECIFIED
Thomas, HubertusDLR Research Group Complex Plasma, OberpfaffenhofenUNSPECIFIED
Date:20 March 2015
Journal or Publication Title:Physical Review E
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1103/PhysRevE.91.033110
Page Range:033110
Publisher:American Physical Society
Keywords:complex (dusty) plasma, dust acoustic waves, sound velocity of Yukawa fluids, fluid description of complex plasmas
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 / Theory, Simulation
Location: Oberpfaffenhofen
Institutes and Institutions:Research Group Complex Plasma
Deposited By: Khrapak, Sergey
Deposited On:30 Mar 2015 09:30
Last Modified:18 Jun 2020 04:22

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