Kinetic boundary of metastable states in superheated and stretched liquids
Kinetic boundary of metastable states in superheated and stretched liquids
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DOI：
10.1016/s0378-4371(99)00169-7
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发表时间：
1999-07-15
期刊：
影响因子：
3.3
通讯作者：
Kiselev, SB
中科院分区：
文献类型：
--
作者：
Kiselev, SB
引入亚稳态的物理边界--动力学调幅节线作为轨迹，在此轨迹中，临界核的平均形成时间短于支配涨落到局部平衡的特征时间。将这个定义推广到负压下，得到了一个新的成核势垒热力学关系式。在这种方法中，动力学旋节线完全由状态方程和液体的表面张力决定。动量节线从临界点开始，首先跟踪过热液体的稳定极限，然后通过负压，从而确定拉伸液体的稳定极限。为了将计算结果与在过热和拉伸流体中的实验数据进行比较，考虑了亚稳区甲烷和水的热力学性质。(C)1999 Elsevier Science B.V.保留所有权利。
A physical boundary of metastable states - kinetic spinodal is introduced as a locus where the mean time of formation of a critical nucleus becomes shorter than a characteristic time governing the decay of fluctuations to local equilibrium. To extend this definition at negative pressures a new thermodynamic relation for the nucleation barrier has been obtained. The kinetic spinodal in this approach is completely determined by the equation of state and by the surface tension of the liquids. Starting from the critical point the kinetic spinodal first traces the limit of stability of superheated liquid, then passes through the negative pressures, thus defining the limit of stability for stretched liquid. For a comparison of the results of calculations with the experimental data in the superheated and stretched fluids the thermodynamic properties of methane and water in the metastable region are considered. (C) 1999 Elsevier Science B.V. All rights reserved.