Correlating gas transport parameters and x-ray computed tomography measurements in porous media

Naveed, Muhammad ORCID:, Hamamoto, Shoichiro, Kawamoto, Ken, Sakaki, Toshihiro, Takahashi, Manabu, Komatsu, Toshiko, Moldrup, Per, Lamandé, Mathieu, Wildenschild, Dorthe, Prodanović, Maša and de Jonge, Lis Wollesen (2013) Correlating gas transport parameters and x-ray computed tomography measurements in porous media. Soil Science, 178 (2). pp. 60-68. ISSN 0038-075X

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Gas transport parameters and X-ray computed tomography (CT) measurements in porous medium under controlled and identical conditions provide a useful methodology for studying the relationships among them, ultimately leading to a better understanding of subsurface gaseous transport and other soil physical processes. The objective of this study was to characterize the relationships between gas transport parameters and soil-pore geometry revealed by X-ray CT. Sands of different shapes with a mean particle diameter (d 50) ranging from 0.19 to 1.51 mm were used as porous media under both air-dried and partially saturated conditions. Gas transport parameters including gas dispersivity (α), diffusivity (D P/D 0), and permeability (k a) were measured using a unified measurement system (UMS). The 3DMA-Rock computational package was used for analysis of three-dimensional CT data. A strong linear relationship was found between α and tortuosity calculated from gas transport parameters (

), indicating that gas dispersivity has a linear and inverse relationship with gas diffusivity. A linear relationship was also found between k a and d 50/T UMS 2, indicating a strong dependency of k a on mean particle size and direct correlation with gas diffusivity. Tortuosity (T MFX) and equivalent pore diameter (d eq.MFX) analyzed from microfocus X-ray CT increased linearly with increasing d50 for both Granusil and Accusand and further showing no effect of particle shape. The T UMS values showed reasonably good agreement with T MFX values. The k a showed a strong relationship when plotted against d eq.MFX/T MFX 2, indicating its strong dependency on pore size distribution and tortuosity of pore space.

Item Type: Article
Identifier: 10.1097/SS.0b013e318288784c
Subjects: Construction and engineering > Civil and environmental engineering
Depositing User: Muhammad Naveed
Date Deposited: 17 May 2018 14:49
Last Modified: 06 Feb 2024 15:57

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