Dynamical behavior and transport coefficients of the pseudo hard-sphere fluid

In this work, we employ a recent approach to characterize the hard-sphere (HS) fluid by means of a continuous interaction potential, commonly referred to as pseudo hard-sphere potential, in order to determine HS transport coefficients as a function of the volume fraction for the three-dimensional mo...

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Bibliographic Details
Published in:Physics of fluids (1994) 2023-08, Vol.35 (8)
Main Authors: Nicasio-Collazo, Luz Adriana, Ramírez-Medina, Carlos Alberto, Torres-Carbajal, Alexis
Format: Article
Language:English
Subjects:
Autocorrelation functions
Fluid dynamics
Heat conductivity
Heat transfer
Molecular dynamics
Physics
Self diffusion
Shear stress
Shear viscosity
Thermal conductivity
Transport properties
Viscosity
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Summary:In this work, we employ a recent approach to characterize the hard-sphere (HS) fluid by means of a continuous interaction potential, commonly referred to as pseudo hard-sphere potential, in order to determine HS transport coefficients as a function of the volume fraction for the three-dimensional mono disperse fluid. Using equilibrium molecular dynamics simulations, we determine time-dependent velocity, shear stress, and energy flux autocorrelation functions in order to use them within the Green–Kubo framework to compute the self-diffusion, shear viscosity, and thermal conductivity coefficients, respectively. Results are discussed as a function of the volume fraction and were compared to theoretical and simulations results previously reported by other authors. The main purpose of this work is twofold: first, testing the continuous approach of the HS fluid for the computation of dynamic properties and second, performing a systematic determination of aforementioned transport coefficients to analyze them as a function of fluid volume fraction. Furthermore, our results are used to provide a practical correction to the Chapman–Enskog equations for the HS self-diffusion, shear viscosity, and thermal conductivity predictions in a wide range of volume fractions.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0158162