基于流动法的Picker型比热容测量系统研究

doi:10.3969/j.issn.1000-1158.2023.04.01

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摘要为了研究稀溶液的表观摩尔热容,研制了一套Picker型流动法比热容测量系统,采用对称的双管路结构,以水作为参考流体,通过进样前后2次调节测温电桥平衡的过程,直接得到待测流体与参考流体的比热容比值。实验系统的温度测量范围为278~343K,压力为常压。使用氯化钠(NaCl)溶液对系统进行验证实验,结果与文献值平均相对偏差均在1%以内,表明实验系统具有良好的稳定性及准确性。

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	归凌燕
	孟现阳
	李东东
	吴江涛

关键词 ：计量学;比热容;表观摩尔热容;稀溶液, 流动法

Abstract：In order to study the apparent molar heat capacity of the dilute solution, a Picker-type flow calorimeter for specific heat capacity measurement based on the differential method is developed. It has a symmetrical dual-cell structure, with one tube serves as working cell and the other serves as reference cell. Using water as the reference fluid, the ratio of specific heat capacity of the sample and reference fluid is obtained by adjusting the balance of the temperature measurement bridge before and after the injection. The system is designed to operate at temperatures 278K to 343K and atmospheric pressure. The verification experiment is carried out using aqueous sodium chloride (NaCl) and the average relative deviation between the experimental data and the literature values is within 1%, which showed that the system is of good reliability and high accuracy.

Key words： metrology;specific heat capacity;apparent molar heat capacity;dilute solution flow method

收稿日期: 2022-01-02 发布日期: 2023-04-18

PACS:

TB941

基金资助:国家自然科学基金(51976164);青海省-国家自然科学基金委柴达木盐湖化工联合基金(U1707602)

通讯作者: 吴江涛(1973-),浙江东阳人,西安交通大学教授,从事热物性测试技术与测量标准、热物性理论与状态方程等方面研究。Email:jtwu@mail.xjtu.edu.cn E-mail: jtwu@mail.xjtu.edu.cn

作者简介: 归凌燕(1996-),陕西咸阳人,西安交通大学在读博士研究生,研究方向为比热容测量技术。Email: lingyan.g@yahoo.com

引用本文:

归凌燕,孟现阳,李东东,吴江涛. 基于流动法的Picker型比热容测量系统研究[J]. 计量学报, 2023, 44(4): 495-502.
GUI Ling-yan,MENG Xian-yang,LI Dong-dong,WU Jiang-tao. Development of Picker-type Calorimeter for Specific Heat Capacity Measurement Based on Flow Method. Acta Metrologica Sinica, 2023, 44(4): 495-502.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2023.04.01 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2023/V44/I4/495

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