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对固-气两相颗粒多孔材料导热系数的预测,尚未见以实验数据对其各预测模型进行分析及验证其准确度的相关文献。本文利用断电热线法测定石英砂、碳化硅、工程沙以及煤灰的导热系数;将模型预测结果与实验数据进行对比分析,结果表明,Kunii and Smith模型误差小;考虑孔隙率的影响,利用实测数据对Kunii and Smith模型进行修正,给出新的预测模型;通过与国外学者给出的实测导热系数的对比,验证了本文给出的修正模型的准确性。
For the prediction of the thermal conductivity of solid-gas two-phase porous materials, no relevant data have been found to analyze and verify the accuracy of each prediction model with experimental data. In this paper, the thermal conductivity of quartz sand, silicon carbide, engineering sand and coal ash were determined by the power-off hot-wire method. Comparing the model predictions with the experimental data, the results show that the errors of Kunii and Smith model are small. Considering the influence of porosity, The measured data are used to revise the Kunii and Smith model, and a new prediction model is given. The accuracy of the modified model given in this paper is verified by comparison with the measured thermal conductivity given by foreign scholars.