稳态法测量不良导体导热系数原理的修正

Amendment to the Measurement of Thermal Conductivity of Poor Conductor by Using the Steady-state Method

导热系数是一个重要的物理量,不良导体导热系数的测定,是热学中比较重要的实验.对稳态法测量不良导体导热系数的原理进行探讨,指出这一测量方法中原理上存在的缺陷,充分考虑样品厚度、侧面散热、环境温度等各种影响因素后,应用自然对流换热理论,对实验原理进行修正,对结果进行讨论,结果表明可以提高测量的精度.

Thermal conductivity is a very important physical parameter.The measurement of thermal conductivity of poor conductor is a significant experiment in thermology. In this paper the principles of measuring thermal conductivity of poor conductors are discussed through the steady- state method, and the shortcomings of this method are pointed out. The theory of natural-con- vection heat transfer principle is employed hereafter to amend the experimenting principle with such factors as the thickness of the object, heat elimination of side and the ambient temperature taken into full account. Results show that the amended formula works in improving the measure- ment accuracy.