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RAS Energy, Mechanics & ControlПрикладная математика и механика Journal of Applied Mathematics and Mechanics

  • ISSN (Print) 0032-8235
  • ISSN (Online) 3034-5758

MODELING DISSIPATIVE PROCESSES IN OPEN AND CLOSED HYDRODYNAMIC SYSTEMS

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PII
S3034575825050091-1
DOI
10.7868/S3034575825050091
Publication type
Article
Status
Published
Authors
V. Ya. Rudyak
  • Affiliation:
    Novosibirsk State University of Architecture and Civil Engineering
    Siberian Federal University
Volume/ Edition
Volume 89 / Issue number 5
Pages
825-842
Abstract
In this paper, the modeling of transport processes in both closed and open hydrodynamic systems is discussed. The main focus is on reviewing the relevant mechanisms. It is shown that in weakly nonequilibrium systems, dissipative processes are caused by microscopic thermal molecular fluctuations, and their irreversibility is associated with the non-potential nature of intermolecular interactions. In open hydrodynamic systems the rheology of the fluid changes at sufficiently high shear rates. The nature of these changes is demonstrated using molecular dynamics simulations. It is established that with increasing shear rate, both simple liquid and nanofluids become pseudoplastic. In the latter case, the critical shear rate of rheology change depends on the concentration of nanoparticles and their size. However, at sufficiently high shear rates, dissipative processes cease to depend on the sizes of the internal structural elements of the medium. Its viscosity drops sharply. In all cases, the change in the rheology of the medium is associated with the transformation of its structure. In particular, with the degradation of the short-range order.
Keywords
вязкость диффузия молекулярная динамика наножидкости необратимость определяющие соотношения процессы переноса реология флуктуационная-диссипационная теорема
Date of publication
01.05.2025
Year of publication
2025
Number of purchasers
0
Views
14

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