| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lamandé, Mathieu
Norwegian University of Life Sciences
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2022Root traits of crop species contributing to soil shear strengthcitations
- 2017A novel method for estimating soil precompression stress from uniaxial confined compression testscitations
- 2012In situ subsoil stress-strain behaviour in relation to soil precompression stresscitations
- 2012Gas Dispersion in Granular Porous Media under Air-Dry and Wet Conditions
- 2012Linking air and water transport in intact soils to macro-porosity by combining laboratory measurements and X-ray Computed Tomography
- 2010Challenges in the development of analytical soil compaction modelscitations
Places of action
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article
Gas Dispersion in Granular Porous Media under Air-Dry and Wet Conditions
Abstract
Subsurface gaseous-phase transport is governed by three gas transport<br/>parameters: the air permeability coefficient (ka), gas diffusion coefficient<br/>(DP), and gas dispersion coefficient (DH). Among these, DH is the least<br/>understood due to hitherto limited research into the relationship between<br/>gas dispersion and soil physical characteristics. In this study, a series of<br/>advection–dispersion experiments was performed on granular porous media<br/>to identify the effects of soil column dimensions (length and diameter),<br/>particle size and shape, dry bulk density, and moisture content on the<br/>magnitude of gas dispersion. Glass beads and various sands of different<br/>shapes (angular and rounded) with mean particle diameters (d50) ranging<br/>from 0.19 to 1.51 mm at both air-dry and variable moisture contents<br/>were used as granular porous media. Gas dispersion coefficients and gas<br/>dispersivities (a = DH/v, where v is the pore-gas velocity) were determined<br/>by fitting the advection–dispersion equation to the measured breakthrough<br/>curves. For all test conditions, DH increased linearly with v. The test results<br/>showed that neither soil column length nor diameter had significant effect<br/>on gas dispersivity. Under air-dry conditions, higher gas dispersivities were<br/>observed for media with wider particle size distribution and higher dry bulk<br/>density. The minor effect of particle shape on gas dispersivity was found<br/>under both air-dry and wet conditions. Under wet conditions, the variations<br/>in gas dispersivity were mainly controlled by the air-filled porosity. An<br/>empirical model was also proposed for the prediction of gas dispersivity in<br/>granular, unsaturated porous media.