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

Naveed, Muhammad, 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
Subjects: Construction and engineering > Civil and environmental engineering
Depositing User: Muhammad Naveed
Date Deposited: 17 May 2018 14:49
Last Modified: 18 May 2018 06:52

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