The “adiabatic” piston at equilibrium: Spectral analysis and time-correlation function
The “adiabatic” piston at equilibrium: Spectral analysis and time-correlation function
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平衡时的“绝热”活塞：谱分析和时间相关函数
DOI：
10.1209/epl/i2002-00132-1
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Velasco
中科院分区：
文献类型：
--
作者：
J. A. White;F. L. Román;A. González;S. Velasco
研究了平衡状态下绝热活塞位置的功率谱和时间相关函数。分析是通过分子动力学模拟的两个硬盘气体在平衡分离的可移动的活塞没有内部自由度。对于不同的活塞质量，我们得到的一些主要的时间尺度的问题。特别是，我们得到的活塞频率的质量依赖性，其阻尼常数，从准平衡到全球平衡的弛豫时间的近似表达式，与最近的非平衡分子动力学模拟系统。
The power spectrum and the time-correlation function of the position of the "adiabatic" piston at equilibrium are investigated. The analysis is made by means of molecular dynamics simulations of two hard-disk gases at equilibrium separated by a movable piston without internal degrees of freedom. For different piston masses we obtain results for some of the main time scales involved in the problem. In particular we obtain an approximate expression for the mass dependence of the piston frequency, its damping constant, and the relaxation time from quasiequilibrium to global equilibrium, in agreement with recent nonequilibrium molecular dynamics simulations of the system.