考虑热探针接触热阻的热物性测量方法研究

Study on thermalproperty measurement method considering thermal contact resistance of the thermal probe

提出了基于考虑接触热阻的热探针导热微分方程的精确解,利用蒙特卡罗反演和分层修正的热探针热物性测量方法,可以同时测量热导率、比热容等热物性参数.利用该方法,对一些液体和固体材料的热导率进行了测量,并与其他测量方法的结果进行了分析与比较.结果表明,采用该方法所得热导率具有较高的精度,平均测量误差约为1.1%;进而针对比热容反演精度较低的问题,论文采用分层修正方法后,比热容的平均测量误差可达到2.6%,精度有了较大提高.对测量结果进行比较发现,接触热阻对固体热导率影响较大,对液体热导率的影响可以忽略;接触热阻对比热容的测量结果的影响不大.

A thermal properties measurement method is proposed,based on the exact solution of the thermal probe problem,in which the thermal contact resistance is considered.Thermal conductivity,specific heat capacity and other thermal properties can be measured with the utilization of the Monte Carlo inversion and a layered correction method.The thermal conductivities of several liquid and solid samples were measured,and the effects of various methods were analyzed and compared.The results show that the average measurement deviation is about 1.1% and a higher precision is obtained with the method presented.For the low precision inversion of specific heat capacity,a layered correction method was adopted and the average measurement deviation could reach 2.6%,thus greatly enhancing the measurement accuracy.The measurement results show that the thermal contact resistance has a great effect on the thermal conductivities of solid samples,but has little or no effect on liquid samples or on the specific heat capacity of all samples.