【摘要】 建立的孔结构模型包含两个孔结构参数.确定模型参数时不涉及由常规方法测得的孔分布数据.该模型用于文献中以及作者的测试结果,表明能良好地反映多孔介质的孔结构特征.更多还原

【Abstract】 A two-parameter model (TPM) for determining the effective diffusivities (De) in porous solids has been proposed. The model is applicable to monodis-perse and/or bidisperse pore systems. The resultant expression ot the model for De may be written as:where w and are adjustable model parameters, evaluated from steady or unsteady state diffusion measurements and independent of pore-size distribution and other textural data.Applying TPM to the results of steady and unsteady state diffusion measurements in literature and this article, it is found that the parameters are independent of measurement conditions such as carrier gas, tracer, temperature and pressure. It is concluded that TPM serves well as a reflection ot the textural characteristics of porous solids.更多还原