一个新的二甲醚气液相密度方程  

A New Equation of Liquid and Gaseous Densities for Dimethyl Ether

作　　者：孙艳军[1] 王晓坡[1] 周永[1] 刘志刚[1] 

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《西安交通大学学报》2012年第9期1-5,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51006083;50836004);中国博士后科学基金资助项目(20110491658);西安交通大学基本科研业务费资助项目

摘　　要：为了获得二甲醚的气液相密度,在对二甲醚PVT实验数据进行文献调研的基础上,基于对比态原理运用准牛顿优化算法得到了一个6参数的用于计算二甲醚气相和液相密度的方程.气相和液相方程适用于温度从三相点温度至临界温度,压力最大达到70MPa.新方程计算的二甲醚气液相密度值与实验数据比较后表明:两者的气相密度平均绝对偏差的范围从低温区的0.1%到临界点附近的1%;两者的液相密度平均绝对偏差的范围从低温区的0.1%到临界点附近的3%.A liquid and gaseous density equation with six parameters for dimethyl ether was developed by the quasi-Newton optimization algorithm on the basis of extensive collection of PVT experimental data. The new density equation is suitable for the conditions of the temperatures from the triple point to the critical point and the pressure up to 70 MPa. The comparison between the predictions and the experimental data shows that the average absolute deviations of the density equation are from 0. 1% in the low temperature region to 1% near the critical point for gaseous dimethyl ether while they are from 0. 1% in the low temperature region to 3% near the critical point for liquid dimethyl ether.

关 键 词：二甲醚 气液相密度 状态方程 PVT性质 

分 类 号：TK123[动力工程及工程热物理—工程热物理]