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Velocity Distribution of a Homogeneously Cooling Granular Gas

Yu, Peidong and Matthias, Schröter and Sperl, Matthias (2020) Velocity Distribution of a Homogeneously Cooling Granular Gas. Physical Review Letters, 124. American Physical Society. doi: 10.1103/PhysRevLett.124.208007. ISSN 0031-9007.

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Official URL: https://doi.org/10.1103/PhysRevLett.124.208007


In contrast to molecular gases, granular gases are characterized by inelastic collisions and require therefore permanent driving to maintain a constant kinetic energy. The kinetic theory of granular gases describes how the average velocity of the particles decreases after the driving is shut off. Moreover, it predicts that the rescaled particle velocity distribution will approach a stationary state with overpopulated high-velocity tails as compared to the Maxwell-Boltzmann distribution. While this fundamental theoretical result was reproduced by numerical simulations, an experimental confirmation is still missing. Using a microgravity experiment that allows the spatially homogeneous excitation of spheres via magnetic fields, we confirm the theoretically predicted exponential decay of the tails of the velocity distribution.

Item URL in elib:https://elib.dlr.de/135102/
Document Type:Article
Title:Velocity Distribution of a Homogeneously Cooling Granular Gas
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Yu, PeidongUNSPECIFIEDhttps://orcid.org/0000-0001-6664-5942UNSPECIFIED
Matthias, SchröterUNSPECIFIEDhttps://orcid.org/0000-0002-8332-5585UNSPECIFIED
Sperl, MatthiasUNSPECIFIEDhttps://orcid.org/0000-0001-9525-0368UNSPECIFIED
Date:22 May 2020
Journal or Publication Title:Physical Review Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Physical Society
Keywords:granular gas, microgravity, kinetic theory, Mapheus
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 - Research under Space Conditions
DLR - Research theme (Project):R - Model systems
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Sperl, Matthias
Deposited On:02 Jun 2020 07:13
Last Modified:24 Oct 2023 11:55

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