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POURBAKHTIAR, A, POULSEN, T G, WILKINSON, S and BRIDGE, Jonathan (2017). Effect of wind turbulence on gas transport in porous media: experimental method and preliminary results. European Journal of Soil Science, 68 (1), 48-56.
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Pourbakhtiar_et_al-2017-European_Journal_of_Soil_Science.pdf - Published Version Creative Commons Attribution. Download (1MB) | Preview |
Abstract
We demonstrate a novel experimental arrangement for measuring wind turbulence-induced gas transport in dry porous media under controlled conditions. This equipment was applied to assess the effect of wind turbulence on gas transport (quantified as a dispersion coefficient) as a function of distance to the surface of the porous medium exposed to wind. Two different strategies for the measurement of wind-induced gas transport were compared. Experiments were carried out with O2 and CO2 as tracer gases with average vertical wind speeds of 0.02–1.06 m s−1. Oxygen breakthrough curves as a function of distance to the wind-exposed surface of the porous medium were analysed numerically with a finite-difference-based model to assess gas transport. We showed that wind turbulence-induced gas transport is an important transport mechanism that can be 20–70 times larger than molecular diffusion-induced transport. Wind conditions and properties of the porous medium had strong controlling effects on this relationship. Importantly, we show that even though wind-induced gas transport is greatest near to the wind-exposed surface, it can have marked effects on the variation in gas concentration at much greater depths.
| Item Type: | Article |
|---|---|
| Departments - Does NOT include content added after October 2018: | Faculty of Social Sciences and Humanities > Department of Natural and Build Environment |
| Identification Number: | https://doi.org/10.1111/ejss.12403 |
| Page Range: | 48-56 |
| Depositing User: | Jonathan Bridge |
| Date Deposited: | 30 Jan 2017 14:52 |
| Last Modified: | 18 Mar 2021 16:06 |
| URI: | https://shura.shu.ac.uk/id/eprint/15042 |
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