Abstract Mass transfer in porous media is governed, besides the species diffusion coefficient, by the porosity and the geometrical parameters of the materials microstructure. This paper aims at developing a methodology for the determination of tortuosity and constrictivity factor based on a diffusion modeling in a porous medium of neutral species. Tortuosity was obtained by the computation of particles trajectory. After which, constrictivity was deduced from the formation factor, represented by the relative diffusion coefficient. Results show that tortuosity evolves in the opposite direction that the porosity while constrictivity evolves in the same direction. In addition, both parameters further slowdown the transfer for lower porosities.

中文翻译：

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多孔介质微观结构几何参数的测定：在胶凝材料中的应用

摘要 除物质扩散系数外，多孔介质中的传质还受孔隙率和材料微观结构的几何参数的影响。本文旨在开发一种基于中性物质多孔介质中的扩散模型来确定曲率和收缩系数的方法。曲折度是通过计算粒子轨迹获得的。之后，从地层因子推导出收缩性，用相对扩散系数表示。结果表明，曲折度的演化方向与孔隙度和收缩度的演化方向相反。此外，这两个参数进一步减慢了较低孔隙率的转移。