运用平衡态分子动力学理论对含有液氩分子微正则系统的微气泡的形成过程进行模拟。采用五阶预估-校正有限差分法对每个分子的牛顿运动方程进行求解,该方法能够较好地满足能量守恒特性。通过统计各时刻系统的动能,势能以及总能量,得到了气泡生长过程中各相分子的分布形貌,并且分析了温度对气泡生长过程的影响及相界面不稳定的原因。模拟得到:气泡形成过程可分成四部分:团聚段、成核段、等温成长段以及等压成长段,以此粗略估计气泡的成核时间大约为0.2×10~(-11)s。温度对于沸腾的团聚和成核时间没有影响。当过热度大于22 K时,随着过热度增大,两相区域数密度波动特别大。相界面不稳定是气泡的破碎引起的。
Equilibrium molecular dynamics(EMD)was employed to simulate the microbubble gen- eration of liquid argon molecules in a microcanonical ensemble.The Newton s equation of each atom was solved according to a 5~(th) gear predictor-corrector finite difference integrator algorithm,which has better energy conservation characteristics.This study provided the phase configuration of molecules during the process of bubble growth based on the data of the potential,kinetic and total energy at any instant.As well,the inf...