双电桥液体导热系数测试系统研究及应用  

Research and application of liquid thermal conductivity measurement system based on a double-bridge method

作　　者：杨书伟 袁月 郭奕含 Yang Shuwei;Yuan Yue;Guo Yihan(College of Architectural Engineering,Zhengzhou Business University)

机构地区：[1]郑州商学院建筑工程学院

出　　处：《制冷与空调》2023年第8期14-18,共5页Refrigeration and Air-Conditioning

基　　金：2022年郑州地方高校大学生创新创业训练计划项目“双电桥液体导热系数测试系统研究及应用”(202214040021)

摘　　要：为了解决液体导热系数测试装置成本高及使用不方便等问题,设计一种双电桥液体导热系数测试装置。该装置采用阻容滤波和数字滤波,使输出的信号更加稳定,通过模拟腔体温度场发现,腔体有限边界和液体自然对流对测量导热系数的影响可以忽略。根据理论推导的导热系数模型,对输出的温度数据采用分组筛选的方法进行处理,分别得到了硅油、甘油、乙醇、水、甲醇、正己烷的导热系数值,测试结果的相对误差均在±4%内,验证了测试装置的可靠性。In order to solve the problems of high cost and inconvenient use of liquid thermal conductivity measurement device,a double-bridge device is developed for measuring thermal conductivity of liquid.The device adopts resistive capacitance filter and digital filter to make the output signal more stable.Through the simulation on the cavity temperature field,it shows that the effects of the finite boundary and the liquid natural convection on the thermal conductivity measurement can be ignored.According to the theoretical model of thermal conductivity,the temperature data are processed by grouping and screening method,and the thermal conductivity values of silicone oil,glycerol,ethanol,water,methanol and hexane are obtained respectively.The relative error of the test results is within±4%,which verifies the reliability of the test device.

关 键 词：导热系数 瞬态热线法 数值模拟 分组筛选法 

分 类 号：TM9[电气工程—电力电子与电力传动]