Assessment of gas permeability coefficient of porous materials

Wałowski, Grzegorz

doi:10.1016/j.jsm.2017.08.001

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…As demonstrated in studies by Rettore , Rettore Wałowski (2017), there is variation in the characteristics of porous pipe from different batches as a result of the manufacturing process, which causes non-uniformity in the material and consequently changes in the hydraulic characteristics. In this study, it was shown that there is variation even within the same batch, causing non-uniformity in the application of water.…”

Section: Hydraulic Head Loss and Absolute Roughnessmentioning

confidence: 99%

“…(c)). Rettore identified that porous pipes are subjected to changes in diameter due to internal pressure because they are elastic; this explains the variation among the curves obtained under different pressures Wałowski (2017). studied the variation in the gas Table9| Effect of the interaction between the inlet pressure and the cumulative irrigation tests on the water flux through the porous pipes…”

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confidence: 99%

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Hydraulic characterization of porous pipes

et al. 2021

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Increased anthropic activity in the environment leads to degradation and increased waste generation that includes tires, which can be used for the manufacture of porous pipes by extrusion for irrigation or aeration. There are no defined methodologies for the hydraulic characterization of porous pipes; in addition, their performance is questionable because the permeability of the wall in contact with water seems to decrease with time. Thus, this study aimed to perform the hydraulic characterization of porous pipes. Experiments were performed to assess the variation in permeability over time, the head loss, the friction factor, and the roughness. Statistical tests were performed to investigate possible significant differences between treatments. The results showed that the permeability varies over time and tends to decrease with each application of water. After a certain period, the permeability tends to become constant, and a stable flux can be determined, being the lowest average permeability and flux values found 0.591 × 10−15 m² 0.109 m³·m−2·s−1. There is variability in the permeability between pipe samples from the same batch as well as variability within the same sample, as indicated by the fact that some samples are similar to each other while others differ when performing a pairwise multiple comparison.

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Section: Hydraulic Head Loss and Absolute Roughnessmentioning

confidence: 99%

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confidence: 99%

Hydraulic characterization of porous pipes

et al. 2021

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“…Currently, one of the most effective supports is aluminum oxide due to low cost and chemical inertness to hydrogen and other gases [ 7 , 8 ]. The pores in aluminum oxide materials should be controlled to obtain good transportation properties for gas molecules diffused through the membranes [ 9 ]. MAX phases are a relatively new class of nanolaminated materials, generally described as M n+1 AX n (where M—transition metal, A—element of A group (mostly IIIA and IVA), X—carbon and/or nitrogen, n = 1–3).…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Porous Ti3AlC2-Doped Al2O3 Composites Obtained by Slip Casting Method for Membrane Application

et al. 2023

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In the present work, porous composites were fabricated from pure Al2O3 and mixed Ti3AlC2/Al2O3 powder by slip casting and sintering. The effect of sintering temperature and different composition ratio on microstructure, phase composition, porosity and gas permeation flux of the fabricated materials was investigated. The microstructure and phase composition of the samples were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The gas permeation experiments were performed using pure hydrogen at 0.1–0.9 MPa pressure. It is shown that a decrease in sintering temperature from 1500 to 1350 °C results in an increase in hydrogen permeation flux of the alumina from 5 to 25 mol/(m2 × s), which is due to higher pore size and overall porosity of the samples. Sintering of Ti3AlC2/Al2O3 powder mixtures leads to the formation of Al2O3, Al2TiO5 and TiO2 phases as a result of oxidation of the Ti3AlC2 phase, resulting in an increased pore size in the composites compared with pure alumina. The open porosity of composites increases from 3.4 to 40% with an increasing Ti3AlC2/Al2O3 ratio from 1/10 to 1/2, respectively. The composites with the highest porosity (40%) had a maximum permeation flux of 200 mol/(m2 × s). The changes in the bending strength of the alumina and composite samples, depending on the microstructure and porosity, were also discussed. The investigated composites are considered promising materials for hydrogen separation membrane supports.

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“…Metal foams are a modern class of low density porous materials whose mechanical, electric and thermal properties, provided by their base metal constituents, enable a variety of useful functional applications [ 8 ]. Currently, they are used for biomedical applications [ 9 ], filtration methods [ 10 , 11 , 12 ], heat exchangers [ 13 ], fuel cell systems [ 14 ], lightweight structures [ 15 ], energy absorption [ 16 ], and sound control system environments [ 17 ]. Their diverse material properties stem from a variety of production methods, allowing precise microstructural tailoring to suit the desired application.…”

Section: Introductionmentioning

confidence: 99%

GAKTpore: Stereological Characterisation Methods for Porous Foams in Biomedical Applications

et al. 2021

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In tissue engineering, scaffolds are a key component that possess a highly elaborate pore structure. Careful characterisation of such porous structures enables the prediction of a variety of large-scale biological responses. In this work, a rapid, efficient, and accurate methodology for 2D bulk porous structure analysis is proposed. The algorithm, “GAKTpore”, creates a morphology map allowing quantification and visualisation of spatial feature variation. The software achieves 99.6% and 99.1% mean accuracy for pore diameter and shape factor identification, respectively. There are two main algorithm novelties within this work: (1) feature-dependant homogeneity map; (2) a new waviness function providing insights into the convexity/concavity of pores, important for understanding the influence on cell adhesion and proliferation. The algorithm is applied to foam structures, providing a full characterisation of a 10 mm diameter SEM micrograph (14,784 × 14,915 px) with 190,249 pores in ~9 min and has elucidated new insights into collagen scaffold formation by relating microstructural formation to the bulk formation environment. This novel porosity characterisation algorithm demonstrates its versatility, where accuracy, repeatability, and time are paramount. Thus, GAKTpore offers enormous potential to optimise and enhance scaffolds within tissue engineering.

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Assessment of gas permeability coefficient of porous materials

Cited by 14 publications

References 14 publications

Hydraulic characterization of porous pipes

Hydraulic characterization of porous pipes

Structure and Properties of Porous Ti3AlC2-Doped Al2O3 Composites Obtained by Slip Casting Method for Membrane Application

GAKTpore: Stereological Characterisation Methods for Porous Foams in Biomedical Applications

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