ESTABLISHMENT OF THE THERMAL AND RADIATIVE PROPERTY MODEL FOR OPEN-CELLULAR MATERIALS

1)本文用法向透射率拟合法测定了Ni-Cr和堇青石开孔多孔板在室温下的消光系数，用发射率拟合法测定了这两种材料在400 ~ 1000 K温度范围内的非对称因子和消光系数。所得到的结果和其他可用的实验数据进行了比较与理论预测的基础上，我们的立方晶胞模型的辐射特性。2）采用保护热板法测量了Ni-Cr多孔板和堇青石多孔板的平均总有效导热系数。在实验中，冷边界保持在约。热边界温度在370 ~ 1000 1 K范围内变化时，多孔板的导热与辐射复合传热得到了理论分析。使用立方晶胞模型的热和辐射性能。在与实验相对应的条件下。所得理论结果与实验结果进行了比较。此外，还发现，立方晶胞模型预测的有效导热系数的笔-蜂窝多孔材料的重现可用的实验数据的79%，误差小于a * 30%。

1) The extinction coefficients of Ni-Cr and cordierite open-cellular porouse plates were determined at room temperature using the normal transmittance fitting method, while the asymrnetry factor and the albedos of these materials were determined in a temperature range from 400 to 1000 K using the emittaice fitting method. The obtained results and other available experimental data were compared with theoretical predictions based on our cubic unit cell model for the radiative properties. It is fcmnd that the agreemeut between model predictions and experimerital results is quite satisfactory.2) The mean total effective thermal conductivities of Ni-Cr and cordierite porous plates were measured using a guarded hot plate method. In the experiment, the cold boundary was kept at about. 290 K.while the temperature of the hot boundary was varied from 370 K to 1000 1K.Combined conductive and radiative heat transfer through the porous plates was analyzed theoreticaly. using the cubic unit cell model for the thermal and radiative properties. under the conditions corresponding to the experiment. The obtained theoretical results were favorably compared with the experimental ones. Moreover, it is found that the cubic unit cell model for predicting the conductive effective thermal conductivity of a pen-cellular porous materials reproduces 79% of available experimental data with an error of less tha a *30%.