基于流动法的Picker型比热容测量系统研究  

Development of Picker-type Calorimeter for Specific Heat Capacity Measurement Based on Flow Method

作　　者：归凌燕 孟现阳[1] 李东东[2] 吴江涛[1] GUI Ling-yan;MENG Xian-yang;LI Dong-dong;WU Jiang-tao(Key Laboratory of Thermo-Fluid Science and Engineering of MOE,Xi an Jiaotong University,Xi an,Shaanxi,710049,China;Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,Qinghai 810008,China)

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,陕西西安710049 [2]中国科学院青海盐湖研究所,青海西宁810008

出　　处：《计量学报》2023年第4期495-502,共8页Acta Metrologica Sinica

基　　金：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)。

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278~343 K,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。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 278 K to 343 K 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.

关 键 词：计量学 比热容 表观摩尔热容 稀溶液 流动法 

分 类 号：TB941[一般工业技术—计量学]