平行热线法测定耐火材料导热系数的理论基础及技术

The theoretical bases of parallel hot wire technique for determining thermal conductivity of refractory

在一无限大试样中有一无限细而长的线状热源，导出了试样导热系数的计算公式。该公式与ISO8894-2中的计算公式相吻合。实验表明，使用的热线的直径与材质以及热电偶的直径对测得的导热系数的准确性有一定影响，尤其是热线和热电偶的对称埋设对测量结果的准确性是十分重要的。

An equation to calculate thermal conductivity of the test pieces was made from the hypothesis i. e a piece of in-finitely thin and long hot -wire source was embedded in an immeasurably big test piece.This equation is identical tothe one in ISO 8894-2.The diameter of the hot-wire,the material and the diameter of the thermocouple have influenceon the accuracy of the thermal conductivity. It is important for the accruracy of the measurement to embed hot wireand thermocouple syrnmetrically.