固化吸附剂导热系数测量参数选择

Thermal Conductivity Measurement of Consolidated Adsorbent

在开发高导热吸附剂过程中经常需要测量材料的导热系数,稳态平板法测量导热系数因方法简单直接而应用广泛。通过数值模拟和实验发现侧面散热对导热系数测量影响很大,采用大空间自然对流换热实验关联式对试验数据处理公式进行修正,可得到较满意的实验结果,并进一步研究了热源温度、样品厚度、试样导热系数对侧面散热的影响。为减少侧面散热以及热电偶波动对测量结果的影响,并考虑到试样加工难易程度,就所用实验装置而言,试样厚度在12mm较为适宜,热源温度选用55℃较为适宜。

The measurement of thermal conductivity is important in developing high-thermal conductivity adsorbents, and the steady-state method is widely used in measuring thermal conductivity. The numerical simulation and experiments were conducted and it is found that heat release at the side of a sample has great influence on the measurement of thermal conductivity and the data processing can be improved by adopting the natural convection empirical formula. The further investigation was performed on the influence of heat source temperature, thickness of the sample and thermal conductivity of test sample on heat release at the side of a sample. Under our experimental condition, it seems that the thickness of a sample might be 12mm and the heat resource temperature might be 55℃ to reduce the effect of side heat release and thermocouple reading surge on the measurement.