瞬态热线法导热系数测量的数值模拟

Numerical simulation of measurement of thermal conductivity with transient hot wire method

利用有限元方法对瞬态热线法导热系数测量进行了数值模拟,对各种因素如加热功率、热线半径以及实验温度等对测量过程的影响进行了分析,并将模拟得到的温升曲线与实验测量得到的温升曲线进行了比较,结果表明:通过选择适当的参数值,模拟曲线可以与实测曲线吻合得很好,实验值与模拟值的偏差小于实验结果的不确定度.本结果的获得对进一步理解瞬态热线法导热系数测量过程,提高导热系数测量技术水平具有借鉴意义.

Measurement of thermal conductivity by transient hot wire method was simulated using finite element method. The effect of various factors such as power supply, radius of hot wire and temperature on measurement was analyzed. The simulated temperature-rise curve was compared with the experimental result. The result shows that the simulated curve coincides with the experimental curve very well and the deviation is less than experimental uncertainties.