关键词: 稳态法, 导热系数, 柱面坐标系, 温度梯度

Abstract: We measure the radial and axial temperature gradients in a steady-state thermal conductivity experiment.  After calibration, the axial gradient is determined to be -0.221°C/cm, while the radial gradient measures -0.0045°C/cm. Under the assumption of linear temperature distribution, the temperature difference between the upper and lower surfaces of the test sample at thermal equilibrium is reconstructed. Additionally, the time-dependent heat dissipation rate of the cooling disk is quantified. The results demonstrate that the thermal conductivity of the sample is 0.157 W/(m·K), representing a 6.0% improvement in measurement accuracy compared to conventional methods.

Key words: steady-state method, thermal conductivity, cylindrical coordinate system, temperature gradient