气体流量大小对气体热导率测量结果影响的研究

The Influence of Gas Flow Rate on the Measurement Result of Gas Thermal Conductivity

本实验使用热线法测量气体的热导率,主要研究气体流量大小对气体热导率测量结果的影响。实验结果表明,测量误差随着气体流量增加而增加,而所需要的测量时间随着气体流量增加而减小。从测量误差和学生课时两方面综合考虑,最佳的气体流量大小是13 ml/min至20 ml/min之间。

In this experiment,the thermal conductivity of gas was measured by hot wire method,and the influences of the gas flow on the measurement errors and the experiment time are mainly studied.The optimum flow rate is studied from several aspects ,such as the test time and the percentage difference of the experiment.The experimental results show that the measurement error increases with the increase of gas flow, and the required measurement time decreases with the increase of gas flow. Considering the measurement error and the students＇ class time, the optimum gas flow rates are between 13 ml/min and 20 ml/min.