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首页> 外文期刊>Journal of industrial and engineering chemistry >New isotherm regularity and an equation of state for gases and liquids
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New isotherm regularity and an equation of state for gases and liquids

机译：新的等温规律性和气体和液体的状态方程

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摘要

In this paper an isotherm regularity has been introduced for gases and liquids based on intermolecular potential energy. The experimental data has been used to demonstrate the validity of the regularity. A non-linearity relationship exists between (Z - 1 )v~3 and p for all isotherms ofliquids and gases. The basis for this regularity is intermolecular potential which is a modified Lennard-Jones potential (9, 6,3) for repulsive, dispersion, dipole-dipole and longer-ranged interactions. The isotherm regularity is equivalent to a virial-like EOS for which the parameters of the isotherm form the corresponding second, third and fourth virial-like coefficients. The equation of state is simple and ready to use. The parameters of equation of state are determined by fitting isothermal regularity to experimental data. The new equation of state provides excellent results in homogenous gas and homogeneous liquids region to very high pressures while its predictions in gas-liquid transition have more deviations. Densities of 1828 data points of 21 components have been calculated over the entire range of data with a maximum pressure of 1000 MPa. The average absolute deviation between calculated and experimental densities for gases, liquids and gas-liquid transition region are 0.06%, 0.03% and 0.90%, respectively.
机译：在本文中，已经基于分子间势能为气体和液体引入了等温线规律性。实验数据已被用来证明规则性的有效性。对于液体和气体的所有等温线，在（Z-1）v〜3与p之间存在非线性关系。这种规律性的基础是分子间的电势，这是一种针对排斥，分散，偶极-偶极和更长距离相互作用的改良的Lennard-Jones势（9、6,3）。等温线规律性等同于像病毒一样的EOS，对于该EOS，等温线的参数形成相应的第二，第三和第四像病毒一样的系数。状态方程很简单，可以立即使用。通过将等温规律性拟合到实验数据来确定状态方程的参数。新的状态方程在均质气体和均质液体区域至非常高的压力下提供了出色的结果，而其在气-液转变中的预测则有更大的偏差。在最大压力为1000 MPa的整个数据范围内，已计算出21个组件的1828个数据点的密度。气体，液体和气-液过渡区域的计算密度和实验密度之间的平均绝对偏差分别为0.06％，0.03％和0.90％。

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