Lennard-Jones流體在超重力場下的氣液相平衡
Vapor-Liquid Equilibria of Lennard-Jones Fluids under High Gravity
Date Issued
2005
Date
2005
Author(s)
Su, Chen-Hao
DOI
zh-TW
Abstract
Molecular dynamics simulations are used to study the phase equilibrium of the vapor-liquid coexistence system. In this study, we simulated Lennard-Jones fluid, two-center Lennard-Jones fluid and three-center Lennard-Jones fluid, and calculated the liquid density, the vapor density, and the surface tension. According to the scaling law, the critical temperature and critical density of these systems were determined. They are Tc*=1.0854 ρc*=0.3133 for the Lennard-Jones fluid, Tc*=1.4450 ρc*=0.2906 for the two-center Lennard-Jones fluid, and Tc*=1.6533ρc*=0.2719 for the three-center Lennard-Jones fluid. We checked the relationship between the surface tension and the temperature. The temperature dependence of the surface tension is well described by the scaling law. The effect of the surface area on the surface tension was investigated. It is found that the surface tension increases with the decrease in the surface area. However, this effect is pronounced only in small surface areas. When the vapor-liquid equilibrium system is under high gravity, the liquid density increases, the vapor density decreases, and the surface tension increases.
Subjects
超重力場
氣液相平衡
分子模擬
high gravity
vapor-liquid equilibrium
molecular simulation
Type
thesis
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