CREMASCHINI, Claudio, Jiří KOVÁŘ, Zdeněk STUCHLÍK and Massimo TESSAROTTO. Polytropic representation of the kinetic pressure tensor of non-ideal magnetized fluids in equilibrium toroidal structures. PHYSICS OF FLUIDS. 2023, vol. 35, No 1, p. "017123-1"-"017123-14", 14 pp. ISSN 1070-6631. Available from: https://dx.doi.org/10.1063/5.0134320.
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Basic information
Original name Polytropic representation of the kinetic pressure tensor of non-ideal magnetized fluids in equilibrium toroidal structures
Authors CREMASCHINI, Claudio (380 Italy, belonging to the institution), Jiří KOVÁŘ (203 Czech Republic, belonging to the institution), Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution) and Massimo TESSAROTTO (380 Italy, belonging to the institution).
Edition PHYSICS OF FLUIDS, 2023, 1070-6631.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/23:A0000298
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1063/5.0134320
UT WoS 000912154000009
Keywords in English Non-ideal fluids;Pressure tensors; Microscopic kinetics;Chapman-Enskog expansion;fluid plasma;accretion-disk;
Tags RIV24, UF
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 26/2/2024 13:19.
Abstract
Non-ideal fluids are generally subject to the occurrence of non-isotropic pressure tensors, whose determination is fundamental in order to characterize their dynamical and thermodynamical properties. This requires the implementation of theoretical frameworks provided by appropriate microscopic and statistical kinetic approaches in terms of which continuum fluid fields are obtained. In this paper, the case of non-relativistic magnetized fluids forming equilibrium toroidal structures in external gravitational fields is considered. Analytical solutions for the kinetic distribution function are explicitly constructed, to be represented by a Chapman-Enskog expansion around a Maxwellian equilibrium. In this way, different physical mechanisms responsible for the generation of non-isotropic pressures are identified and proved to be associated with the kinetic constraints imposed on single and collective particle dynamics by phase-space symmetries and magnetic field. As a major outcome, the validity of a polytropic representation for the kinetic pressure tensors corresponding to each source of anisotropy is established, whereby directional pressures exhibit a specific power-law functional dependence on fluid density. The astrophysical relevance of the solution for the understanding of fluid plasma properties in accretion-disk environments is discussed.
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