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英国论文精粹:A new three-parameter cubic equation of state for calculation physical properties

论文作者:英语论文网论文属性:学术文章 Scholarship Essay登出时间:2014-03-18编辑:zbzbz点击率:5752

论文字数:957论文编号:org201308150834381755语种:英语 English地区:英国价格:免费论文

关键词:三参数立方型方程计算物理性质

摘要:本文主要描述了三参数状态方程在物理性质计算中的应用,是一篇行文规范的英文论文,留学生朋友可以通过阅读,体会英文论文的写作技巧,从而能够提高写作水平。

A new three-parameter cubic equation of state for calculation physical properties

一个新的三参数立方型状态方程计算的物理性质


1. Introduction
  Equation of state (EOS) is a powerful tool in accurate repre-sentation of thermodynamic properties of a wide variety of pure fluids in a wide range of temperature and pressure. It can also be applied for calculation of thermodynamic properties of the mixtures using proper mixing rule. Based on the intermolecular interactions, the developed EOSs have been classified into two cat-egories as was indicated by Wei and Sadus [1]. The first group of EOS is based on the van der Waals type of cubic equation of state and the other group is developed by molecular-based approach. Based on molecular principles, construction of equations of state has been started by thermodynamic perturbation theory that leads to several theories such as SAFT [2] and PHCT [3]. In the recent
years the molecular-based approaches have been extended prop-erly to improve the theoretical backbone of EOS using statistical thermodynamics. These molecular-based equations of state have been presented for modeling of the vapor–liquid equilibria of some complex systems such as polymer solutions and associated mix-tures [1]; however for hydrocarbon and polar simple molecules the cubic EOS has still superiority so that the improvements in molecular theories are introduced some complexities.

1 引言

    状态方程(EOS)是在一个宽范围的温度和压力大的纯流体的热力学性质的各种精确表示一个强大的工具。它也可以应用于使用适当的混合规则的混合物的热力学性质的计算。基于分子间的相互作用,所开发的思想已被分为两个猫都是卫和sadus [ 1 ]。EOS第一组是基于立方型状态方程的范德瓦尔斯型,另一组是由分子为基础的方法。基于分子的原则,状态方程的建设已由热力学微扰理论,导致诸如安全[ 2 ]和[ 3 ]的几个理论开始PHCT。在最近的几年分子为基础的方法已经被扩展,适当提高EOS使用统计热力学的理论支柱。这些分子基础的状态方程已经提出了一些复杂的系统,如聚合物溶液汽液平衡模型和相关的混合–特点[ 1 ];然而烃分子极简单的立方型状态方程仍然优势使分子理论的改进提出了一些复杂性。

  Thus, due to relative simplicity of cubic Equation of State, CEOS, it is popu-lar in calculation of physical properties applicable in chemical and physical processes to design of chemical, petrochemical and envi-ronmental industries. Since van der Waals cubic equation of state, many modifications have been developed to improve accuracy of cubic equations of state for precise calculation of physical prop-erties of pure compounds and mixtures. These modifications may be categorized in two approaches so that the first method is based either on construction of a new equation of state by developing a new attractive or repulsive expression or a new combination of the available attractive and repulsive terms [4–15]. Attempt in the sec-ond approach is focused to improve the temperature dependence of the attractive parameter through a new alpha function[16–21] .
  Following Redlich–Kwong EOS [4], that introduced the co-volume parameter, b, and a simple temperature function in attractive part of vdW CEOS, several modifications on both repul-sive and attractive expressions of CEOS have been proposed. These various versions have been extensively reviewed by the others [1,22,23]. The several expressions have been developed for the hard sphere term of CEOS, such as those were proposed by Scott [24] , Kim et al. [25] and Mohsen-Nia et al. [12] . Although these modifications of the repulsive term are in better agreement with the simulation data of hard sphere, however the common expres-sion, which is widely used for repulsive term of a cubic EOS, is the vdW repulsive term. The empirical modification of the a论文英语论文网提供整理,提供论文代写英语论文代写代写论文代写英语论文代写留学生论文代写英文论文留学生论文代写相关核心关键词搜索。

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