porous mediarandom dense packingporositytortuositypermeabilitynon-spherical particlesThe geometrical and topological configurations of particles have great influences on their surrounding pore tortuosity and the permeability of granular‐porous media. In this work, we develop a relaxation iteration scheme to ...
Porosity, tortuosity, and permeability may vary during formation damage as a result of interactions among rocks, fluids, and particles. Permeability relationships can be classified in two groups: static and dynamic. The static correlations have been derived using the properties of various porous materi...
AGeometricalModelforTortuosityofTortuousStreamlinesinPorousMedia withCylindricalParticles YUNMei—Juan(~美娟), ,YUEYin(乐艮),YuBo—Ming(郁伯铭)。,LuJian-Duo(卢建夺), 一, zHENGWei(郑伟) DepartmentofAppliedPbysics WuhanUniversityofScienceandTechnology,Wuhan430081 ...
whereL_\text {eff}is an effective path length of particles in pore space andLis a sample length (L<L_{eff}and thus,T>1). TheTis calculated from the velocity field obtained either experimentally or numerically. There are experimental techniques for particle path imaging in a porous medium, l...
为了更好的研究煤体孔裂隙结构特征以及求取相关表征参数,本文基于理想的火柴棍模型,结合达西定律和修正的泊谡叶方程,经过严格的理论推导,得到了适用于煤体的迂曲度理论表达式,并以初始迂曲度为参考推导了迂曲度的修正式,同时结合Klinkenberg系数给出了一种初始迂曲度的计算方法.研究结果为求取表征煤体孔裂隙特征的相关...
Permeability of porous materials is an important characteristic which is extensively used in various engineering disciplines. There are a number of issues that influence the permeability coefficient among which the porosity, size of particles, pore shape, tortuosity, and particle size distribution are of...
where γ is the gyromagnetic ratio of the nucleus under investigation (2.68 × 108 rads/s.T, for 1H). The deployment PFG-NMR technique showed a great potential to characterize pore structure and pore size distribution of several types of porous media for different applications based on th...
The tortuosity (a) has been theoretically defined as the ratio of the mean path length (La) to the straight line of porous medium length (L) (Carman, 1937):(1)a=La/L A value of 25/12 was determined for the tortuosity of uniform spherical particles by Bird et al. (1960) using Blak...
Researchers have found that the KC constant is closely related to the micro-pore structure of porous media, so many methods have been used to modify the KC equation. However, this does not mean that all the problems on theoretical prediction of permeability have be solved. When we use ...
The results show a piling up of particles within the porous media leading to a clogging. The capture efficiency remains low (<0.1%). In the case of filtration in the forest of pillars, the capture is faster and arises mainly between the pillars. The increase in tortuosity in the micro...