The Viscosity of Liquids in the Dual Model
In this paper, a reliable model of the viscosity in liquids in the dual model of liquids (DML) framework is developed. The analytical expression arrived at exhibits the correct <i>T</i>–dependence Arrhenius-like exponential decreasing trend, which is typical of Newtonian simple fluids. T...
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2024-12-01
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| author | Fabio Peluso |
| author_facet | Fabio Peluso |
| author_sort | Fabio Peluso |
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| description | In this paper, a reliable model of the viscosity in liquids in the dual model of liquids (DML) framework is developed. The analytical expression arrived at exhibits the correct <i>T</i>–dependence Arrhenius-like exponential decreasing trend, which is typical of Newtonian simple fluids. The model is supported by the successful comparison with both the experimental values of the viscosity of water, and with those related to the mechano-thermal effect in liquids under low-frequency shear, discovered a few years ago, for which the first-ever theoretical interpretation is given by the DML. Moreover, the approach is even supported by the results of numerical models recently developed, that have shown that dual liquid models, such as the DML, provides very good agreement with experimental data. The expression of viscosity contains terms belonging to both the subsystems constituting the liquid, and shows an explicit dependence upon the sound velocity and the collective vibratory degrees of freedom (DoF) excited at a given temperature. At the same time, the terms involved depend upon the Boltzmann and Planck constants. Finally, the physical model is coherent with the Onsager postulate of microscopic time reversibility as well as with time’s arrow for macroscopic dissipative mechanisms. |
| format | Article |
| id | doaj-art-4e5534d06fda4658bdd8d24d92558840 |
| institution | OA Journals |
| issn | 2673-7264 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Thermo |
| spelling | doaj-art-4e5534d06fda4658bdd8d24d925588402025-08-20T02:01:14ZengMDPI AGThermo2673-72642024-12-014450853910.3390/thermo4040028The Viscosity of Liquids in the Dual ModelFabio Peluso0Electronics Division, Leonardo SpA, Via Monterusciello 75, 80078 Pozzuoli, NA, ItalyIn this paper, a reliable model of the viscosity in liquids in the dual model of liquids (DML) framework is developed. The analytical expression arrived at exhibits the correct <i>T</i>–dependence Arrhenius-like exponential decreasing trend, which is typical of Newtonian simple fluids. The model is supported by the successful comparison with both the experimental values of the viscosity of water, and with those related to the mechano-thermal effect in liquids under low-frequency shear, discovered a few years ago, for which the first-ever theoretical interpretation is given by the DML. Moreover, the approach is even supported by the results of numerical models recently developed, that have shown that dual liquid models, such as the DML, provides very good agreement with experimental data. The expression of viscosity contains terms belonging to both the subsystems constituting the liquid, and shows an explicit dependence upon the sound velocity and the collective vibratory degrees of freedom (DoF) excited at a given temperature. At the same time, the terms involved depend upon the Boltzmann and Planck constants. Finally, the physical model is coherent with the Onsager postulate of microscopic time reversibility as well as with time’s arrow for macroscopic dissipative mechanisms.https://www.mdpi.com/2673-7264/4/4/28viscosityliquid theoryphononsliquid dual modelsshear viscosity |
| spellingShingle | Fabio Peluso The Viscosity of Liquids in the Dual Model Thermo viscosity liquid theory phonons liquid dual models shear viscosity |
| title | The Viscosity of Liquids in the Dual Model |
| title_full | The Viscosity of Liquids in the Dual Model |
| title_fullStr | The Viscosity of Liquids in the Dual Model |
| title_full_unstemmed | The Viscosity of Liquids in the Dual Model |
| title_short | The Viscosity of Liquids in the Dual Model |
| title_sort | viscosity of liquids in the dual model |
| topic | viscosity liquid theory phonons liquid dual models shear viscosity |
| url | https://www.mdpi.com/2673-7264/4/4/28 |
| work_keys_str_mv | AT fabiopeluso theviscosityofliquidsinthedualmodel AT fabiopeluso viscosityofliquidsinthedualmodel |