Viscosity in simple fluids: A different perspective based on the thermodynamic dimension

Ghandili, Ali

doi:10.1016/j.fluid.2024.114178

Fluid Phase Equilibria

2024

DOI: 10.1016/j.fluid.2024.114178

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Viscosity in simple fluids: A different perspective based on the thermodynamic dimension

Ali Ghandili

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2024

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The Viscosity of Liquids in the Dual Model

Peluso

2024

Thermo

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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 T–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.

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The Viscosity of Liquids in the Dual Model

Peluso

2024

Thermo

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Viscosity in simple fluids: A different perspective based on the thermodynamic dimension

Cited by 1 publication

References 95 publications

The Viscosity of Liquids in the Dual Model

The Viscosity of Liquids in the Dual Model

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