关键词:

突破直径, 速度滑移, 渗透率, 颗粒堆积型多孔介质

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.

Key words:

突破直径, 速度滑移, 渗透率, 颗粒堆积型多孔介质