亚临界和超临界压力下液态正癸烷比定压热容实验研究

doi:10.11949/0438-1157.20190203

化工学报 ›› 2019, Vol. 70 ›› Issue (9): 3238-3247.DOI: 10.11949/0438-1157.20190203

亚临界和超临界压力下液态正癸烷比定压热容实验研究

王瑞欣¹(),郭亚军¹(),冯松²,毕勤成²

1. 西安建筑科技大学建筑设备科学与工程学院，陕西西安 710055
2. 西安交通大学动力工程多相流国家重点实验室，陕西西安 710049

收稿日期:2019-03-07 修回日期:2019-05-15 出版日期:2019-09-05 发布日期:2019-09-05
通讯作者: 郭亚军
作者简介:王瑞欣（1995—），女，硕士研究生，1250798540@qq.com
基金资助:
国家自然科学基金项目(51776167)

Experimental study on isobaric specific heat capacity of liquid n-decane at subcritical and supercritical pressures

Ruixin WANG¹(),Yajun GUO¹(),Song FENG²,Qincheng BI²

1. School of Building Services Science and Engineering，Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China

Received:2019-03-07 Revised:2019-05-15 Online:2019-09-05 Published:2019-09-05
Contact: Yajun GUO

摘要/Abstract

摘要：

为了准确测量液态正癸烷的比定压热容，采用流动型绝热量热法,搭建了一套适用于亚临界和超临界压力下的流体比定压热容测量系统。对温度为311~570 K、压力为0.12~6.02 MPa的正癸烷比定压热容进行测量，结果表明比定压热容随温度的升高而增加，但压力对正癸烷的比定压热容影响较小，并将实验值与文献值进行对比，结果表明两者的最大相对偏差在5.0%以内，平均相对偏差在1.39%以内。将实验值与Guseinov模型和Garg模型两种经验模型进行对比，并在两种经验模型的基础上，提出改进后的比定压热容模型。改进后的模型精度较高，其最大绝对偏差为1.32%，平均相对偏差为0.53%,可为其他碳氢燃料的比定压热容的推算提供基础和参考依据。

关键词: 亚临界压力, 超临界压力, 比定压热容, 绝热量热法, 正癸烷

Abstract:

In order to accurately measure the isobaric specific heat capacity of liquid n-decane, a flow adiabatic calorimeter was constructed for subcritical pressure and supercritical pressure. The isobaric specific heat capacity of n-decane was measured at temperatures ranging from 311 K to 570 K and pressures ranging from 0.12 MPa to 6.02 MPa. The results show that the isobaric specific heat capacity of n-decane increases as the temperatures rise. And the system pressures have little effects on the isobaric specific heat capacity of n-decane. The experimental results were compared with the reference data. The results show that the maximum absolute deviation (MAD) is within 5.0%, and the average absolute deviation (AAD) is below 1.39%. Meanwhile, the experimental results were compared with Guseinov and Garg models. Based on the two empirical models, the improved isobaric specific heat capacity model was proposed. The improved model has higher fitting accuracy, showing that the MAD is 1.32%, and the AAD is 0.53%, which provides a basis and reference for the calculation of isobaric specific heat capacity of other hydrocarbon fuels.

Key words: subcritical pressure, supercritical pressure, isobaric specific heat capacity, adiabatic calorimetry, n-decane

中图分类号:

TK 39

王瑞欣, 郭亚军, 冯松, 毕勤成. 亚临界和超临界压力下液态正癸烷比定压热容实验研究[J]. 化工学报, 2019, 70(9): 3238-3247.

Ruixin WANG, Yajun GUO, Song FENG, Qincheng BI. Experimental study on isobaric specific heat capacity of liquid n-decane at subcritical and supercritical pressures[J]. CIESC Journal, 2019, 70(9): 3238-3247.

图/表 3

参考文献 34

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亚临界和超临界压力下液态正癸烷比定压热容实验研究

Experimental study on isobaric specific heat capacity of liquid n-decane at subcritical and supercritical pressures

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