Matlab软件在热线法测定气体热导率实验中的应用

摘要

热线法可以测定气体热导率，以干燥空气为例进行了测量。实验中测量的物理量较多，人工处理数据比较繁琐，且容易出错，因此使用Matlab软件处理数据。把测量的实验数据输入Excel表格中，然后把Excel文件引入到Matlab软件中，运行相关程序后可以直接得到气体的热导率和测量的百分差，处理过程快捷精确。 Matlab软件处理数据时，对部分实验数据进行了最小二乘法处理，可以由线性外推法求出ΔQ/Δt。%With dry air as example,the thermal conductivity of gas can be determined with the hot-wire method,in which many physical parameters are measured. Also the data process by hands is trivial with high error probability. Therefore,the data is processed with Matlab software. The measured data in the Excellfile can be imported into and processed by the Matlab software,and then the thermal conductivity of gas can be obtained quickly and precisely with low percentage difference. Particularly,some experiment data is processed with least-square method so that theΔQ/Δt can be obtained by the linear extrapolation method.