一种近理想气体热力学函数变化量的计算  

Ariation Calculation of Thermodynamic Function for a Near-ideal Gas

作　　者：李宇 霍怡廷 王思琼 吴春灵 吴珍 张弦 Li Yu;Huo Yiting;Wang Siqiong;Wu Chunling;Wu Zhen;Zhang Xian(Redbud Innovation Institute of Ordos,Inner Mongolia,017000;Department of Chemical Engineering,Ordos Institute of Technology,Inner Mongolia,017000)

机构地区：[1]鄂尔多斯市紫荆创新研究院,内蒙古017000 [2]鄂尔多斯应用技术学院化学工程系,内蒙古017000

出　　处：《当代化工研究》2020年第19期114-116,共3页Modern Chemical Research

基　　金：内蒙古自治区高等学校“青年科技英才支持计划”项目(NJYT-17-B14,NKYT-18-B23)。

摘　　要：一种状态方程为P(Vm-b)=RT的近理想气体,与理想气体性质存在较多共同点。近理想气体的摩尔熵S、摩尔内能U、摩尔亥姆霍兹函数A和定压摩尔热容Cp与理想气体相同,偏离性质为零。采用偏离函数、二变量的微分方程、定义公式、热力学基本关系式和热力学函数性质五种方法计算近理想气体的热力学函数变化量,比较这五种方法的优缺点,发现二变量的微分方程和热力学基本关系式两类方法简单易懂,适合应用。The near-ideal gas,whose state equation is P(Vm-b)=RT and properties are similar to the ideal gas equation’s.The molar entropy S,internal energy U,Helmholtz function A and molar heat capacity CP of near ideal gas are the same as those of ideal gas,and the deviation property is zero.The variation of thermodynamic function of near ideal gas is calculated by five methods:deviation function,differential equation of two variables,definition formula,basic thermodynamic relationship and properties of thermodynamic function.The advantages and disadvantages of these five methods are compared.It is found that the differential equation of two variables and basic thermodynamic relationship methods are easy to understand and suitable for application.

关 键 词：理想气体 热力学函数 变化量 

分 类 号：O642.1[理学—物理化学]