Gas-liquid phase coexistence and finite-size effects in a two-dimensional Lennard-Jones system  

作　　者：OUYANG WenZe XU ShengHua SUN ZhiWei 

机构地区：[1]Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

出　　处：《Chinese Science Bulletin》2011年第26期2773-2779,共7页

基　　金：supported by the National Natural Science Foundation of China (20903112,10972217);the Knowledge Innovation Program of Chinese Academy of Sciences (KJCX2-YW-L08)

摘　　要：The gas-liquid phase coexistence in a two-dimensional Lennard-Jones system is investigated using Maxwell construction method together with molecular dynamics simulations.The results of phase coexistence in different truncations of the potential are compared with data obtained from the literature,and the corresponding critical properties calculated.The crossover from Ising-like to mean field behavior is observed and confirmed as the temperature approaches the critical point from below.Performing simulations on systems with different sizes,we find that a finite size effect is more significant than those shown in most of the previous results,and a lower critical temperature is obtained when the full extent of this finite size effect is considered.The gas-liquid phase coexistence in a two-dimensional Lennard-Jones system is investigated using Maxwell construction method together with molecular dynamics simulations. The results of phase coexistence in different truncations of the potential are compared with data obtained from the literature, and the corresponding critical properties calculated. The crossover from Ising-like to mean field behavior is observed and confirmed as the temperature approaches the critical point from below. Performing simulations on systems with different sizes, we find that a finite size effect is more significant than those shown in most of the previous results, and a lower critical temperature is obtained when the full extent of this finite size effect is considered.

关 键 词：有限尺寸效应 气液相 系统 二维 共存 分子动力学模拟 规模效应 临界温度 

分 类 号：O359.1[理学—流体力学]