Bulk viscosity in the case of the interatomic potential depending on density.
Bulk viscosity in the case of the interatomic potential depending on density.
复制标题
原子间势取决于密度时的体积粘度。
DOI：
10.1103/physreve.67.021205
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
F. Yonezawa
中科院分区：
文献类型：
--
作者：
H. Okumura;F. Yonezawa
我们推导出一个密度相关势系统的体粘滞系数zeta的公式。这是我们最近提出的与密度无关的势体系体粘公式的推广。在我们的公式中，体粘滞系数用原子间相互作用势和对分布函数等微观量来表示。这具有提供这种微观信息与宏观量zeta之间的关系的突出优点。另一方面，在之前提出的所有公式中，zeta都是用压力这一宏观量来表示的，很难讨论这种关系。我们将我们的公式应用到一个模型的液态金属中，其中原子间的相互作用势随密度而变化。我们的计算结果表明，zeta增加的密度区域，原子间的相互作用势从一种类型到另一种类型的变化。这些结果与液态汞的实验结果定性一致。
We derive a formula for the bulk viscosity zeta in a density-dependent-potential system. This is a generalization of the bulk-viscosity formula for the density-independent-potential system which has been proposed recently by us. In our formulas, the bulk viscosity is expressed by using microscopic quantities such as interatomic potentials and pair distribution functions. This has an outstanding advantage of providing the relation between such microscopic information and a macroscopic quantity zeta. On the other hand, in all formulas proposed previously, zeta is expressed in terms of pressure, a macroscopic quantity, and it is difficult to discuss this relation. We apply our formula to a model liquid metal in which the interatomic potential varies with density. Our calculated results show that zeta increases in the density region where the interatomic potential changes from one type to another. These results agree qualitatively with the experimental results about liquid mercury.