Gas and liquid permeability in nano composites gels: Comparison of Knudsen and Klinkenberg correction factors

KG²B, a collaborative benchmarking exercise for estimating the permeability of the Grimsel granodiorite – Part 1: measurements, pressure dependence and pore-fluid effects

“…Gas permeability estimations must take into account the gas compressibility, and the measured permeability is an apparent value that needs to be corrected for the so-called gas slippage effect: the "liquid equivalent" permeability can be obtained by applying the Klinkenberg correction (Klinkenberg, 1941) to gas permeability measurements made at different mean pore pressures. When the pore size is of the same order as the gas molecule mean free path, additional corrections have to be done to account for Knudsen diffusion (Anez et al, 2014;Ziarani & Aguilera, 2012). Whatever the fluid used, permeability measurements require also a sufficiently low flow rate to avoid inertial effects, otherwise the Forchheimer correction has to be applied (e.g.…”

A Mercury Intrusion Porosimetry Method for Methane Diffusivity and Permeability Evaluation in Coals: A Comparative Analysis

“…In general, Klinkenberg's effect becomes important when the mean free path of gas molecules is comparable to the pore-throat radius. Normally, Klinkenberg's effect increases in fine-grained, low-permeability porous media [22]. The effect of gas slippage is even more pronounced for rarefied gas flow where the Knudsen number is much higher (K n > 10).…”

“…Consequently, permeability to gas results in higher values compared with permeability to liquid for a given porous medium including coals and shales. Many techniques can be used to measure the diffusivity and permeability in coals [14][15][16][20][21][22]. However, some scholars proposed some theoretical models to evaluate the diffusivity and permeability in porous media from the perspective of pore structure in coals.…”

Anticorrosive efficiency of alkyd resin-based coatings containing Mg–Zn–Fe mixed oxide-based pigments

“…The effi cient solution of anticorrosion metal protection is offered by the formation of complex protecting coating systems consisting of a base paint with the content of nontoxic anticorrosion pigments of inorganic nature and of a top coat that ensures pronounced barrier effects and contains substances preventing the decomposition of a binder exposed to UV radiation [3,4]. The protective properties of organic coatings are dependent, among other factors, on their impermeability to liquids and gases [5][6][7]. Protective fi lm impermeability to liquids and gases can be improved by using nonisometric fi llers [8,9].…”