Topic
Permeability (earth sciences)
About: Permeability (earth sciences) is a research topic. Over the lifetime, 15424 publications have been published within this topic receiving 288535 citations.
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01 Jan 2007TL;DR: In this article, the problem of estimating Klinkenbergcorrected permeability from single-point, steady-state measurements on samples from low permeability sands is addressed, and the original problem of predicting the corrected or "liquid equivalent" permeability has been under investigation since the early 1940s.
Abstract: This work addresses the problem of estimating Klinkenbergcorrected permeability from single-point, steady-state measurements on samples from low permeability sands. The "original" problem of predicting the corrected or "liquid equivalent" permeability (i.e., referred to as the Klinkenbergcorrected permeability) has been under investigation since the early 1940s — in particular, using the application of "gas
247 citations
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TL;DR: In this paper, the authors used the Darcy law to determine the porosity and the diameter of the fibres in a 3D random fibrous media and derived a semi-empirical constitutive model for the permeability of the media.
Abstract: Fluid flow analyses for porous media are of great importance in a wide range of industrial applications including, but not limited to, resin transfer moulding, filter analysis, transport of underground water and pollutants, and hydrocarbon recovery. Permeability is perhaps the most important property that characterizes porous media; however, its determination for different types of porous media is challenging due its complex dependence on the pore-level structure of the media. In the present work, fluid flow in three-dimensional random fibrous media is simulated using the lattice Boltzmann method. We determine the permeability of the medium using the Darcy law across a wide range of void fractions (0.08 ⩽ ϕ ⩽ 0.99) and find that the values for the permeability that we obtain are consistent with available experimental data. We use our numerical data to develop a semi-empirical constitutive model for the permeability of fibrous media as a function of their porosity and of the fibre diameter. The model, which is underpinned by the theoretical analysis of flow through cylinder arrays presented by [Gebart BR. Permeability of unidirectional reinforcements for RTM. J Compos Mater 1992; 26(8): 1100–33], gives an excellent fit to these data across the range of ϕ. We perform further simulations to determine the impact of the curvature and aspect ratio of the fibres on the permeability. We find that curvature has a negligible effect, and that aspect ratio is only important for fibres with aspect ratio smaller than 6:1, in which case the permeability increases with increasing aspect ratio. Finally, we calculate the permeability tensor for the fibrous media studied and confirm numerically that, for an isotropic medium, the permeability tensor reduces to a scalar value.
247 citations
01 Jan 1936
246 citations
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TL;DR: In this paper, both in situ measurements of permeability and numerical modelling of changes in permeability induced by micro-crack growth are discussed, and it is shown that a depth of 50-70 cm is a good estimation of the extent of excavation disturbed zone in the tunnel.
244 citations
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TL;DR: In this article, a method is described for studying the flow of gas-liquid mixtures through unconsolidated sands and a relation between permeability and liquid-saturation of the sand is found which permits the correlation of saturation and the steady state flow of the gas and liquid components.
Abstract: A method is described for studying the flow of gas‐liquid mixtures through unconsolidated sands. Results are given for experiments on four sands of widely different permeabilities using carbon dioxide and water as the fluids. A relation between permeability and liquid‐saturation of the sand is found which permits the correlation of saturation and the steady state flow of the gas and liquid components. Generalization of these results for all unconsolidated sands seems permissible. The phenomena of equilibrium permeability and equilibrium liquid‐saturation are described and their significance discussed. It is believed that the experimental attack and type of analysis is applicable to the general problem of the flow of gas‐liquid mixtures through porous media.
244 citations