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

被引:7
作者
Nicasio-Collazo, Luz Adriana [1 ]
Ramirez-Medina, Carlos Alberto [2 ]
Torres-Carbajal, Alexis [3 ]
机构
[1] Tecnol Nacl Mexico, Inst Tecnol Leon, Leon 37290, Guanajuato, Mexico
[2] Forschungszentrum Julich, Inst Biol Informat Proc, D-52425 Julich, Germany
[3] Univ Nacl Autonoma Mexico, Inst Fis, Apdo Postal 20-364, Ciudad De Mexico, Mexico
关键词
TIME-CORRELATION FUNCTIONS; MARKOV RANDOM-PROCESSES; EQUATION-OF-STATE; MOLECULAR-DYNAMICS; STATISTICAL-MECHANICS; SELF-DIFFUSION; IRREVERSIBLE-PROCESSES; PERTURBATION-THEORY; REPULSIVE FORCES; SHEAR VISCOSITY;
D O I
10.1063/5.0158162
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
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. (C) 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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页数:11
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