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一、引言 单热丝法已被广泛地应用于各种材料的导热系数的精确测定。1978年J.Boeret al提出Parallel wire模型,这种模型不再将热丝既作为加热单元又作为测温单元,而是热丝只作为加热单元,检测温度变化是由距加热丝一定距离处的一对热电偶来完成,采用这种方法,他们将以往单丝法所能测试的导热系数的上限提高了一个数量级。 如果应用上述方法测定多孔材料(或非均质材料)的导热系数,则其热电偶所反映的
I. Introduction Single wire method has been widely used in various materials, the thermal conductivity of the precise determination. In 1978, J. Boeret al proposed the Parallel wire model. This model no longer uses the hot wire as both the heating unit and the temperature measuring unit, but the hot wire is only used as the heating unit to detect the temperature change from a certain distance from the heating wire A pair of thermocouples to complete, in this way, they will be able to test the previous monofilament method to increase the upper limit of thermal conductivity by an order of magnitude. If the above method is used to determine the thermal conductivity of porous materials (or heterogeneous materials), the thermocouple reflects