Universität zu Köln

Yu, Peidong, Schroeter, Matthias ORCID: 0000-0002-8332-5585 and Sperl, Matthias ORCID: 0000-0001-9525-0368 (2020). Velocity Distribution of a Homogeneously Cooling Granular Gas. Phys. Rev. Lett., 124 (20). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

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 resealed 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 Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Yu, Peidong UNSPECIFIED UNSPECIFIED UNSPECIFIED Schroeter, Matthias UNSPECIFIED orcid.org/0000-0002-8332-5585 UNSPECIFIED Sperl, Matthias UNSPECIFIED orcid.org/0000-0001-9525-0368 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-333095
DOI:	10.1103/PhysRevLett.124.208007
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	124
Number:	20
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FOURIERS LAW; PARTICLE TRACKING; CLUSTER FORMATION; STATE; STATISTICS; SEGREGATION; VIBRATIONS; DIFFUSION; KINETICS; MEDIA Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33309