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Kawamoto, K.
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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.