论文标题
在广义流体力学框架中，Yukawa流体的显微密度波动的自动相关
Auto-correlations of Microscopic Density Fluctuations for Yukawa Fluids in the Generalized Hydrodynamics Framework
论文作者
论文摘要
目前的工作开发了一种理论程序，用于从密度波动中获取Yukawa系统的运输系数。 Yukawa系统的动力学在包含强耦合和Visco弹性记忆效应的广义流体动力模型的框架中描述。该系统的流体动力基质被精确得出，然后用于获得密度自相关函数（DAF）的分析表达，这是密度波动时间动力学的标记。目前的方法是针对从灰尘血浆系统的分子动力学（MD）模拟的数值数据获得的DAF验证的，该模拟是Yukawa系统的一个实际示例。然后使用从模型方程得出的MD结果和分析表达式获得各种传输系数，并将后者与其他模型的文献中可用的值进行比较。讨论了强耦合和粘弹性影响对传输参数的影响。最后，指出了我们计算的实用性，以从实验确定的DAF中获得可靠的转运系数估计值。
The present work develops a theoretical procedure for obtaining transport coefficients of Yukawa systems from density fluctuations. The dynamics of Yukawa systems are described in the framework of the generalized hydrodynamic model that incorporates strong coupling and visco-elastic memory effects. A hydrodynamic matrix for such a system is exactly derived and then used to obtain an analytic expression for the density autocorrelation function (DAF)- a marker of the time dynamics of density fluctuations. The present approach is validated against a DAF obtained from numerical data of Molecular Dynamics (MD) simulations of a dusty plasma system that is a practical example of a Yukawa system. The MD results and analytic expressions derived from the model equations are then used to obtain various transport coefficients and the latter are compared with values available in the literature from other models. The influence of strong coupling and visco-elastic effects on the transport parameters are discussed. Finally, the utility of our calculations for obtaining reliable estimates of transport coefficients from experimentally determined DAF is pointed out.
