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Granular cooling of ellipsoidal particles in microgravity

Pitikaris, Sebastian and Bartz, Patricia and Yu, Peidong and Cristoforetti, Samantha and Sperl, Matthias (2022) Granular cooling of ellipsoidal particles in microgravity. npj Microgravity, 8 (11), pp. 1-6. Nature Publishing Group. doi: 10.1038/s41526-022-00196-6. ISSN 2373-8065.

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Official URL: https://doi.org/10.1038/s41526-022-00196-6


A three-dimensional granular gas of ellipsoids is established by exposing the system to the microgravity environment of the International Space Station. We use two methods to measure the dynamics of the constituent particles and report the long-time development of the granular temperature until no further particle movement is detectable. The resulting cooling behavior can be well described by Haff’s cooling law with time scale τ. Different analysis methods show evidence of particle clustering towards the end of the experiment. By using the kinetic theory for ellipsoids we compare the translational energy dissipation of individual collision events with the overall cooling time scale τ. The difference from this comparison indicates how energy is distributed in different degrees of freedom including both translation and rotation during the cooling.

Item URL in elib:https://elib.dlr.de/189740/
Document Type:Article
Title:Granular cooling of ellipsoidal particles in microgravity
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Pitikaris, Sebastiansebastian.pitikaris (at) dlr.deUNSPECIFIED
Bartz, PatriciaUniversität zu KölnUNSPECIFIED
Yu, Peidongpeidong.yu (at) dlr.dehttps://orcid.org/0000-0001-6664-5942
Cristoforetti, SamanthaESAUNSPECIFIED
Sperl, MatthiasMatthias.Sperl (at) dlr.deUNSPECIFIED
Date:20 April 2022
Journal or Publication Title:npj Microgravity
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-6
Publisher:Nature Publishing Group
Keywords:granular cooling, kinetic theory, ellipsoids, ISS
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:14 Nov 2022 10:15
Last Modified:14 Nov 2022 10:15

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