【摘要】 对空气通过窄筛分球型颗粒层和窄筛分沙粒在水中自然沉积层孔隙率和突破压力进行实验 ,发现随着多孔颗粒层内的流通通道的微细化 ,即使在常压下 ,气流也会出现速度滑移的稀薄性效应 ,并且颗粒越小速度滑移的影响越显著 ,使得实验测量结果不再与平均粒径 (或平均孔隙直径 )的平方成正比 ,而受制于Knp 数的大小 .给出了考虑这种速度滑移影响的数据综合方法更多还原

【Abstract】 Experiment was conducted on the threshold pressure for atmospheric air through unconsolidated narrow size distributed mini sphere and sand particles at low flow rates. The threshold diameter calculated from measured threshold pressure showed that it did not follow the traditional similarity theory,but also affected by Kn p. This is consistent with the authors’experiment on accurate permeability measurement, and can be explained as a result of gas flow slip effect within such micro pore structure. The current work tends to find the method for predicting the permeability threshold pressure relationship for unconsolidated porous structures so as to develop a basis for accurately measuring the thermophysical properties in the field.更多还原