Modeling Coupled Evaporation and Seepage in Ventilated Cavities [electronic resource]
Cavities excavated in unsaturated geological formations are important to activities such as nuclear waste disposal and mining. Such cavities provide a unique setting for simultaneous occurrence of seepage and evaporation. Previously, inverse numerical modeling of field liquid-release tests and assoc...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2004.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Modeling Coupled Evaporation and Seepage in Ventilated Cavities |h [electronic resource] |
| 260 | |a Washington, D.C. : |b United States. Department of Energy ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Department of Energy, |c 2004. | ||
| 300 | |a 39 pages : |b digital, PDF file. | ||
| 336 | |a text |b txt |2 rdacontent. | ||
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| 338 | |a online resource |b cr |2 rdacarrier. | ||
| 500 | |a Published through SciTech Connect. | ||
| 500 | |a 07/01/2004. | ||
| 500 | |a "v03-0136" | ||
| 500 | |a "MOL.20040828.0220, DC41392" | ||
| 500 | |a C. Ahlers; T. Ghezzehei; R. Trautz; S. Finsterle; P. Cook. | ||
| 520 | 3 | |a Cavities excavated in unsaturated geological formations are important to activities such as nuclear waste disposal and mining. Such cavities provide a unique setting for simultaneous occurrence of seepage and evaporation. Previously, inverse numerical modeling of field liquid-release tests and associated seepage into cavities were used to provide seepage-related large-scale formation properties by ignoring the impact of evaporation. The applicability of such models was limited to the narrow range of ventilation conditions under which the models were calibrated. The objective of this study was to alleviate this limitation by incorporating evaporation into the seepage models. We modeled evaporation as an isothermal vapor diffusion process. The semi-physical model accounts for the relative humidity, temperature, and ventilation conditions of the cavities. The evaporation boundary layer thickness (BLT) over which diffusion occurs was estimated by calibration against free-water evaporation data collected inside the experimental cavities. The estimated values of BLT were 5 to 7 mm for the open underground drifts and 20 mm for niches closed off by bulkheads. Compared to previous models that neglected the effect of evaporation, this new approach showed significant improvement in capturing seepage fluctuations into open cavities of low relative humidity. At high relative-humidity values (greater than 85%), the effect of evaporation on seepage was very small. | |
| 650 | 7 | |a Boundary Layers. |2 local. | |
| 650 | 7 | |a Calibration. |2 local. | |
| 650 | 7 | |a Cavities. |2 local. | |
| 650 | 7 | |a Diffusion. |2 local. | |
| 650 | 7 | |a Evaporation. |2 local. | |
| 650 | 7 | |a Fluctuations. |2 local. | |
| 650 | 7 | |a Humidity. |2 local. | |
| 650 | 7 | |a Mining. |2 local. | |
| 650 | 7 | |a Radioactive Wastes. |2 local. | |
| 650 | 7 | |a Simulation. |2 local. | |
| 650 | 7 | |a Thickness. |2 local. | |
| 650 | 7 | |a Ventilation. |2 local. | |
| 650 | 7 | |a Management Of Radioactive Wastes, And Non-Radioactive Wastes From Nuclear Facilities. |2 edbsc. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Yucca Mountain Project Office. |4 res. | |
| 710 | 1 | |a United States. |b Department of Energy. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
| 856 | 4 | 0 | |u http://www.osti.gov/servlets/purl/837509/ |z Online Access |
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