中文摘要：

本文运用分子动力学模拟方法对氩过热液相中的气相成核过程进行了研究。模拟结果表明液相中形成气泡经历三个过程：一是诱导过程,系统压力基本维持不变;二是气化核心形成,产生大量小气核,系统压力快速上升;三是小气核聚合形成大气核,系统压力缓慢增大至平衡。模拟得到了液相中的气相成核率,较经典成核理论（CNT）预测的气相成核率大8个数量级。随着模拟系统密度以及过热度的增大,液相中的气相成核率也随之增大,与CNT的结论一致。

英文摘要：

The bubble nucleation in superheated Ar liquid is studied by molecular dynamics simulation.The simulation results show that the process of bubble nucleation is divided into three stages.The first stage is the waiting process,in which pressure of system is almost constant.In the second stage,numerous small bubble nucleuses appear and pressure of system increases rapidly.The third stage is the aggregation process of small bubble nucleuses,in this stage the pressure of system increases slowly to a stable value.By analyzing simulation data,the bubble nucleation rate is got, which is eight orders of magnitudes bigger than the result of classic nucleation theory.The bubble nucleation rate increases along with the increasing of density and superheated temperature,which agrees well with one of classic nucleation theory.