中文摘要：

介绍了一种自行设计的微纳孔隙材料的气体渗透过程瞬态实验测量装置,提出了一种测量微纳孔隙材料渗透率的方法,基于达西定律导出了材料渗透率的计算公式。以某种具有微纳孔隙的二氧化硅气凝胶材料为对象,进行了气体渗透过程瞬态实验测量,获得了渗透实验腔内的气体压力变化曲线。并以实验测量数据为依据,考虑滑动渗透效应对测量结果进行Klinkenberg修正,进一步得到了该材料的固有渗透率。结果表明,该实验装置能够实现低渗透性微纳孔隙材料的渗透率测量,所测二氧化硅气凝胶材料样品的渗透率为（4.1±0.1）×10（-16）m2。该实验结果为该类材料的热质扩散性能分析提供了基础物性数据。

英文摘要：

The experimental device which was used for the transient measurement in gas permeation process in micro-nano porous materials was developed,and a method for measuring permeability of micro-nano materials was presented.The formula for calculating permeability was derived based on Darcy＇s Law.A specific silica aerogel material with micro-nano pores was chosen as the research object,and the gas pressure curves of the cavity were obtained.The gas permeability of the micro-nano porous material was calculated and corrected by taking gas slippage effect into account,and the intrinsic permeability of this micro-nano porous material was further acquired with the error modification.The results show that the low permeability of the micro-nano porous material can be measured by this experimental device.The intrinsic permeability of the silica aerogel sample was about（4.1±0.1）× 10（-16） m2.The experimental results can provide basic physical property data for the theoretical analysis on heat and mass diffusion performance.