Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media
The dispersion phenomenon has resulted from the various water flow magnitude and direction in porous media. The dissolved tracer tends to spread due to dispersion and then travel time of tracer through the porous media increases. In unsaturated porous media, dispersion coefficient varies with non-li...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Isfahan University of Technology
2008-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=15221&issue_ID=198 |
| _version_ | 1811334667709710336 |
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| author | T Bunsri M Sivakumar D Hagare |
| author_facet | T Bunsri M Sivakumar D Hagare |
| author_sort | T Bunsri |
| collection | DOAJ |
| description | The dispersion phenomenon has resulted from the various water flow magnitude and direction in porous media. The dissolved tracer tends to spread due to dispersion and then travel time of tracer through the porous media increases. In unsaturated porous media, dispersion coefficient varies with non-linear Darcy’s velocity and the water content. These effects observed in both of the laboratory scale sand and soil columns (20 cm). The unsaturated infiltration column and tracer tests have been used to interpret the relationships between Darcy’s velocity and the water content together with the dispersion coefficient. However, the dispersivity coefficient cannot be measured directly, it has to determine from advection-dispersion equation (ADE), which can be used to model the tracer transport in unsaturated porous media. The model was used to describe the non-linear functions of water contents and dispersivities for both porous media. The simulations have been verified that the dispersion of tracer through soil is higher than sand column and also travel time of tracer through soil is longer than sand column. Even though, soil has very low degree of pore velocity, the high dispersivity is observed in the simulations. The water content and tracer concentration profiles reveal that the increase of dispersivity induces the increase of flow path distance and the decrease of pore velocity. The maximum dispersivity was observed when the water content of porous media is relatively low; this leads the maximum of spreading of tracer. |
| first_indexed | 2024-04-13T17:11:29Z |
| format | Article |
| id | doaj.art-0f0dbbe554644379be1805f055b560af |
| institution | Directory Open Access Journal |
| issn | 1735-3645 |
| language | English |
| last_indexed | 2024-04-13T17:11:29Z |
| publishDate | 2008-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-0f0dbbe554644379be1805f055b560af2022-12-22T02:38:15ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-36452008-01-01123744.Influence of Dispersion on Transport of Tracer through Unsaturated Porous MediaT BunsriM SivakumarD HagareThe dispersion phenomenon has resulted from the various water flow magnitude and direction in porous media. The dissolved tracer tends to spread due to dispersion and then travel time of tracer through the porous media increases. In unsaturated porous media, dispersion coefficient varies with non-linear Darcy’s velocity and the water content. These effects observed in both of the laboratory scale sand and soil columns (20 cm). The unsaturated infiltration column and tracer tests have been used to interpret the relationships between Darcy’s velocity and the water content together with the dispersion coefficient. However, the dispersivity coefficient cannot be measured directly, it has to determine from advection-dispersion equation (ADE), which can be used to model the tracer transport in unsaturated porous media. The model was used to describe the non-linear functions of water contents and dispersivities for both porous media. The simulations have been verified that the dispersion of tracer through soil is higher than sand column and also travel time of tracer through soil is longer than sand column. Even though, soil has very low degree of pore velocity, the high dispersivity is observed in the simulations. The water content and tracer concentration profiles reveal that the increase of dispersivity induces the increase of flow path distance and the decrease of pore velocity. The maximum dispersivity was observed when the water content of porous media is relatively low; this leads the maximum of spreading of tracer.http://jafmonline.net/JournalArchive/download?file_ID=15221&issue_ID=198advection-dispersion proccess numerical model pore-scale water flow unsaturated flow |
| spellingShingle | T Bunsri M Sivakumar D Hagare Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media Journal of Applied Fluid Mechanics advection-dispersion proccess numerical model pore-scale water flow unsaturated flow |
| title | Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media |
| title_full | Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media |
| title_fullStr | Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media |
| title_full_unstemmed | Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media |
| title_short | Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media |
| title_sort | influence of dispersion on transport of tracer through unsaturated porous media |
| topic | advection-dispersion proccess numerical model pore-scale water flow unsaturated flow |
| url | http://jafmonline.net/JournalArchive/download?file_ID=15221&issue_ID=198 |
| work_keys_str_mv | AT tbunsri influenceofdispersionontransportoftracerthroughunsaturatedporousmedia AT msivakumar influenceofdispersionontransportoftracerthroughunsaturatedporousmedia AT dhagare influenceofdispersionontransportoftracerthroughunsaturatedporousmedia |