Magnetic excitation of a granular gas as a bulk thermostat - Kölner UniversitätsPublikationsServer

Adachi, Masato ORCID: 0000-0001-6380-0548, Yu, Peidong and Sperl, Matthias ORCID: 0000-0001-9525-0368 (2019). Magnetic excitation of a granular gas as a bulk thermostat. NPJ Microgravity, 5. LONDON: SPRINGERNATURE. ISSN 2373-8065

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DOI:10.1038/s41526-019-0079-y

Abstract

A thermostat utilizing a varying magnetic field has been developed to agitate soft ferromagnetic particles in microgravity platforms for an investigation of an energy-dissipative granular gas. Although the method has experimentally realized a reasonably homogeneous spatial distribution of particles, the physics behind the magnetically excited particles has not been understood. Therefore, a numerical calculation based on the discrete element method is developed in this paper to explain the realization of homogeneously distributed particles. The calculation method allows considering inelastic and magnetic interactions between particles and tracking the motions due to those interactions during the excitation of the granular gas. The calculation results, compared with the experimental result, show that magnetic interactions between particles, a time-domain variation of magnetic-excitation directions, and random collisions of particles between each magnetic excitation contribute to distribute particles homogeneously.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Adachi, Masato	UNSPECIFIED	orcid.org/0000-0001-6380-0548	UNSPECIFIED
Yu, Peidong	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Sperl, Matthias	UNSPECIFIED	orcid.org/0000-0001-9525-0368	UNSPECIFIED