基于磁悬浮密度计的高精度流体PVT测量系统

doi:10.3969/j.issn.0253-2778.2015.05.009

中国科学技术大学学报 ›› 2015, Vol. 45 ›› Issue (5): 404-408.DOI: 10.3969/j.issn.0253-2778.2015.05.009

基于磁悬浮密度计的高精度流体PVT测量系统

徐航

1.中国科学技术大学热科学和能源工程系，安徽合肥 230027； 2.中国科学技术大学工程与材料科学实验中心，安徽合肥 230027

收稿日期:2015-01-23 修回日期:2015-03-27 出版日期:2015-05-31 发布日期:2015-05-31
通讯作者: 胡芃
作者简介:徐航,男,1988年生,硕士生. 研究方向:流体热物性. E-mail:xuhang0522@126.com
基金资助:
国家自然科学基金(50976113),安徽省自然科学基金(1408085ME108)资助.

High accuracy fluid PVT measurement system based on magnetic suspension densimeter

XU Hang

1.Department of Thermal Science and Energy Engineering， University of Science and Technology of China， Hefei 230027, China； 2.Experimental Center of Engineering and Material Sciences， University of Science and Technology of China， Hefei 230027, China

Received:2015-01-23 Revised:2015-03-27 Online:2015-05-31 Published:2015-05-31

摘要/Abstract

摘要： 建立了一套基于磁悬浮密度计的流体PVT测量系统，其温度测量范围20315~42315 K，标准不确定度为0005 K，压力测量范围0~7 MPa，标准不确定度为700 Pa.通过对恒温系统的改进，缩短了实验本体达到热平衡的时间，提高了温度稳定性.利用该系统对高纯氮气在271~345 K，0~6 MPa范围内进行了密度测量，实验结果与NIST REFPROP90数据相比偏差在01%以内，并对由于拟合维里方程的不确定度、温度测量和压力测量不确定度引起的密度结果的不确定进行了分析.

关键词: 磁悬浮计密度, PVT性质, 氮气, 不确定度分析

Abstract: A fluid PVT measurement system based on magnetic suspension densimeter was developed. The temperature range is 20315~42315 K with standard uncertainty of 0005 K, and the pressure range is 0~70 MPa with standard uncertainty of 700 Pa. The temperature control system was modified, thus the time reaching equilibrium state was shortened and the temperature stability was improved. The developed PVT system was used to measure the density of high purity nitrogen at 271~345 K, 0~6 MPa, and the average absolute deviation between experimental results and the NIST REFPROP90 data was within 01%, and the density uncertainties due to the uncertainties of fitted virial equation and measured temperature and pressure was analyzed.

Key words: magnetic suspension densimeter, PVT property, nitrogen, uncertainty analysis

徐航，蔡旭东，胡芃，金熠. 基于磁悬浮密度计的高精度流体PVT测量系统[J]. 中国科学技术大学学报, 2015, 45(5): 404-408.

XU Hang, CAI Xudong, HU Peng, JIN Yi. High accuracy fluid PVT measurement system based on magnetic suspension densimeter[J]. Journal of University of Science and Technology of China, 2015, 45(5): 404-408.

基于磁悬浮密度计的高精度流体PVT测量系统

High accuracy fluid PVT measurement system based on magnetic suspension densimeter

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